Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

3 files changed, 837 insertions, 0 deletions

diff --git a/drivers/net/ethernet/vertexcom/Kconfig b/drivers/net/ethernet/vertexcom/Kconfig
new file mode 100644
index 000000000..4184a635f
--- /dev/null
+++ b/drivers/net/ethernet/vertexcom/Kconfig
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Vertexcom network device configuration
+#
+
+config NET_VENDOR_VERTEXCOM
+	bool "Vertexcom devices"
+	default y
+	help
+	  If you have a network (Ethernet) card belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about Vertexcom cards. If you say Y, you will be asked
+	  for your specific card in the following questions.
+
+if NET_VENDOR_VERTEXCOM
+
+config MSE102X
+	tristate "Vertexcom MSE102x SPI"
+	depends on SPI
+	help
+	  SPI driver for Vertexcom MSE102x SPI attached network chip.
+
+endif # NET_VENDOR_VERTEXCOM
diff --git a/drivers/net/ethernet/vertexcom/Makefile b/drivers/net/ethernet/vertexcom/Makefile
new file mode 100644
index 000000000..f8b12e312
--- /dev/null
+++ b/drivers/net/ethernet/vertexcom/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Vertexcom network device drivers.
+#
+
+obj-$(CONFIG_MSE102X) += mse102x.o
diff --git a/drivers/net/ethernet/vertexcom/mse102x.c b/drivers/net/ethernet/vertexcom/mse102x.c
new file mode 100644
index 000000000..a75bca124
--- /dev/null
+++ b/drivers/net/ethernet/vertexcom/mse102x.c
@@ -0,0 +1,806 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2021 in-tech smart charging GmbH
+ *
+ * driver is based on micrel/ks8851_spi.c
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/if_vlan.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/cache.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/string_choices.h>
+
+#include <linux/spi/spi.h>
+#include <linux/of_net.h>
+
+#define MSG_DEFAULT	(NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK | \
+			 NETIF_MSG_TIMER)
+
+#define DRV_NAME	"mse102x"
+
+#define DET_CMD		0x0001
+#define DET_SOF		0x0002
+#define DET_DFT		0x55AA
+
+#define CMD_SHIFT	12
+#define CMD_RTS		(0x1 << CMD_SHIFT)
+#define CMD_CTR		(0x2 << CMD_SHIFT)
+
+#define CMD_MASK	GENMASK(15, CMD_SHIFT)
+#define LEN_MASK	GENMASK(CMD_SHIFT - 2, 0)
+
+#define DET_CMD_LEN	4
+#define DET_SOF_LEN	2
+#define DET_DFT_LEN	2
+
+#define MIN_FREQ_HZ	6000000
+#define MAX_FREQ_HZ	7142857
+
+struct mse102x_stats {
+	u64 xfer_err;
+	u64 invalid_ctr;
+	u64 invalid_dft;
+	u64 invalid_len;
+	u64 invalid_rts;
+	u64 invalid_sof;
+	u64 tx_timeout;
+};
+
+static const char mse102x_gstrings_stats[][ETH_GSTRING_LEN] = {
+	"SPI transfer errors",
+	"Invalid CTR",
+	"Invalid DFT",
+	"Invalid frame length",
+	"Invalid RTS",
+	"Invalid SOF",
+	"TX timeout",
+};
+
+struct mse102x_net {
+	struct net_device	*ndev;
+
+	u8			rxd[8];
+	u8			txd[8];
+
+	u32			msg_enable ____cacheline_aligned;
+
+	struct sk_buff_head	txq;
+	struct mse102x_stats	stats;
+};
+
+struct mse102x_net_spi {
+	struct mse102x_net	mse102x;
+	struct mutex		lock;		/* Protect SPI frame transfer */
+	struct work_struct	tx_work;
+	struct spi_device	*spidev;
+	struct spi_message	spi_msg;
+	struct spi_transfer	spi_xfer;
+
+	bool			valid_cmd_received;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry		*device_root;
+#endif
+};
+
+#define to_mse102x_spi(mse) container_of((mse), struct mse102x_net_spi, mse102x)
+
+#ifdef CONFIG_DEBUG_FS
+
+static int mse102x_info_show(struct seq_file *s, void *what)
+{
+	struct mse102x_net_spi *mses = s->private;
+
+	seq_printf(s, "TX ring size            : %u\n",
+		   skb_queue_len(&mses->mse102x.txq));
+
+	seq_printf(s, "IRQ                     : %d\n",
+		   mses->spidev->irq);
+
+	seq_printf(s, "SPI effective speed     : %lu\n",
+		   (unsigned long)mses->spi_xfer.effective_speed_hz);
+	seq_printf(s, "SPI mode                : %x\n",
+		   mses->spidev->mode);
+	seq_printf(s, "Received valid CMD once : %s\n",
+		   str_yes_no(mses->valid_cmd_received));
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(mse102x_info);
+
+static void mse102x_init_device_debugfs(struct mse102x_net_spi *mses)
+{
+	mses->device_root = debugfs_create_dir(dev_name(&mses->mse102x.ndev->dev),
+					       NULL);
+
+	debugfs_create_file("info", S_IFREG | 0444, mses->device_root, mses,
+			    &mse102x_info_fops);
+}
+
+static void mse102x_remove_device_debugfs(struct mse102x_net_spi *mses)
+{
+	debugfs_remove_recursive(mses->device_root);
+}
+
+#else /* CONFIG_DEBUG_FS */
+
+static void mse102x_init_device_debugfs(struct mse102x_net_spi *mses)
+{
+}
+
+static void mse102x_remove_device_debugfs(struct mse102x_net_spi *mses)
+{
+}
+
+#endif
+
+/* SPI register read/write calls.
+ *
+ * All these calls issue SPI transactions to access the chip's registers. They
+ * all require that the necessary lock is held to prevent accesses when the
+ * chip is busy transferring packet data.
+ */
+
+static void mse102x_tx_cmd_spi(struct mse102x_net *mse, u16 cmd)
+{
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+	struct spi_transfer *xfer = &mses->spi_xfer;
+	struct spi_message *msg = &mses->spi_msg;
+	__be16 txb[2];
+	int ret;
+
+	txb[0] = cpu_to_be16(DET_CMD);
+	txb[1] = cpu_to_be16(cmd);
+
+	xfer->tx_buf = txb;
+	xfer->rx_buf = NULL;
+	xfer->len = DET_CMD_LEN;
+
+	ret = spi_sync(mses->spidev, msg);
+	if (ret < 0) {
+		netdev_err(mse->ndev, "%s: spi_sync() failed: %d\n",
+			   __func__, ret);
+		mse->stats.xfer_err++;
+	}
+}
+
+static int mse102x_rx_cmd_spi(struct mse102x_net *mse, u8 *rxb)
+{
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+	struct spi_transfer *xfer = &mses->spi_xfer;
+	struct spi_message *msg = &mses->spi_msg;
+	__be16 *txb = (__be16 *)mse->txd;
+	__be16 *cmd = (__be16 *)mse->rxd;
+	u8 *trx = mse->rxd;
+	int ret;
+
+	txb[0] = 0;
+	txb[1] = 0;
+
+	xfer->tx_buf = txb;
+	xfer->rx_buf = trx;
+	xfer->len = DET_CMD_LEN;
+
+	ret = spi_sync(mses->spidev, msg);
+	if (ret < 0) {
+		netdev_err(mse->ndev, "%s: spi_sync() failed: %d\n",
+			   __func__, ret);
+		mse->stats.xfer_err++;
+	} else if (*cmd != cpu_to_be16(DET_CMD)) {
+		net_dbg_ratelimited("%s: Unexpected response (0x%04x)\n",
+				    __func__, *cmd);
+		ret = -EIO;
+	} else {
+		memcpy(rxb, trx + 2, 2);
+		mses->valid_cmd_received = true;
+	}
+
+	return ret;
+}
+
+static inline void mse102x_push_header(struct sk_buff *skb)
+{
+	__be16 *header = skb_push(skb, DET_SOF_LEN);
+
+	*header = cpu_to_be16(DET_SOF);
+}
+
+static inline void mse102x_put_footer(struct sk_buff *skb)
+{
+	__be16 *footer = skb_put(skb, DET_DFT_LEN);
+
+	*footer = cpu_to_be16(DET_DFT);
+}
+
+static int mse102x_tx_frame_spi(struct mse102x_net *mse, struct sk_buff *txp,
+				unsigned int pad)
+{
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+	struct spi_transfer *xfer = &mses->spi_xfer;
+	struct spi_message *msg = &mses->spi_msg;
+	struct sk_buff *tskb = NULL;
+	int ret;
+
+	netif_dbg(mse, tx_queued, mse->ndev, "%s: skb %p, %d@%p\n",
+		  __func__, txp, txp->len, txp->data);
+
+	if ((skb_headroom(txp) < DET_SOF_LEN) ||
+	    (skb_tailroom(txp) < DET_DFT_LEN + pad)) {
+		tskb = skb_copy_expand(txp, DET_SOF_LEN, DET_DFT_LEN + pad,
+				       GFP_KERNEL);
+		if (!tskb)
+			return -ENOMEM;
+
+		txp = tskb;
+	}
+
+	mse102x_push_header(txp);
+
+	if (pad)
+		skb_put_zero(txp, pad);
+
+	mse102x_put_footer(txp);
+
+	xfer->tx_buf = txp->data;
+	xfer->rx_buf = NULL;
+	xfer->len = txp->len;
+
+	ret = spi_sync(mses->spidev, msg);
+	if (ret < 0) {
+		netdev_err(mse->ndev, "%s: spi_sync() failed: %d\n",
+			   __func__, ret);
+		mse->stats.xfer_err++;
+	}
+
+	dev_kfree_skb(tskb);
+
+	return ret;
+}
+
+static int mse102x_rx_frame_spi(struct mse102x_net *mse, u8 *buff,
+				unsigned int frame_len, bool drop)
+{
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+	struct spi_transfer *xfer = &mses->spi_xfer;
+	struct spi_message *msg = &mses->spi_msg;
+	__be16 *sof = (__be16 *)buff;
+	__be16 *dft = (__be16 *)(buff + DET_SOF_LEN + frame_len);
+	int ret;
+
+	xfer->rx_buf = buff;
+	xfer->tx_buf = NULL;
+	xfer->len = DET_SOF_LEN + frame_len + DET_DFT_LEN;
+
+	ret = spi_sync(mses->spidev, msg);
+	if (ret < 0) {
+		netdev_err(mse->ndev, "%s: spi_sync() failed: %d\n",
+			   __func__, ret);
+		mse->stats.xfer_err++;
+	} else if (drop) {
+		netdev_dbg(mse->ndev, "%s: Drop frame\n", __func__);
+		ret = -EINVAL;
+	} else if (*sof != cpu_to_be16(DET_SOF)) {
+		netdev_dbg(mse->ndev, "%s: SPI start of frame is invalid (0x%04x)\n",
+			   __func__, *sof);
+		mse->stats.invalid_sof++;
+		ret = -EIO;
+	} else if (*dft != cpu_to_be16(DET_DFT)) {
+		netdev_dbg(mse->ndev, "%s: SPI frame tail is invalid (0x%04x)\n",
+			   __func__, *dft);
+		mse->stats.invalid_dft++;
+		ret = -EIO;
+	}
+
+	return ret;
+}
+
+static void mse102x_dump_packet(const char *msg, int len, const char *data)
+{
+	printk(KERN_DEBUG ": %s - packet len:%d\n", msg, len);
+	print_hex_dump(KERN_DEBUG, "pk data: ", DUMP_PREFIX_OFFSET, 16, 1,
+		       data, len, true);
+}
+
+static irqreturn_t mse102x_rx_pkt_spi(struct mse102x_net *mse)
+{
+	struct sk_buff *skb;
+	unsigned int rxalign;
+	unsigned int rxlen;
+	bool drop = false;
+	__be16 rx = 0;
+	u16 cmd_resp;
+	u8 *rxpkt;
+
+	mse102x_tx_cmd_spi(mse, CMD_CTR);
+	if (mse102x_rx_cmd_spi(mse, (u8 *)&rx)) {
+		usleep_range(50, 100);
+		return IRQ_NONE;
+	}
+
+	cmd_resp = be16_to_cpu(rx);
+	if ((cmd_resp & CMD_MASK) != CMD_RTS) {
+		net_dbg_ratelimited("%s: Unexpected response (0x%04x)\n",
+				    __func__, cmd_resp);
+		mse->stats.invalid_rts++;
+		drop = true;
+		goto drop;
+	}
+
+	rxlen = cmd_resp & LEN_MASK;
+	if (rxlen < ETH_ZLEN || rxlen > VLAN_ETH_FRAME_LEN) {
+		net_dbg_ratelimited("%s: Invalid frame length: %d\n", __func__,
+				    rxlen);
+		mse->stats.invalid_len++;
+		drop = true;
+	}
+
+	/* In case of a invalid CMD_RTS, the frame must be consumed anyway.
+	 * So assume the maximum possible frame length.
+	 */
+drop:
+	if (drop)
+		rxlen = VLAN_ETH_FRAME_LEN;
+
+	rxalign = ALIGN(rxlen + DET_SOF_LEN + DET_DFT_LEN, 4);
+	skb = netdev_alloc_skb_ip_align(mse->ndev, rxalign);
+	if (!skb)
+		return IRQ_NONE;
+
+	/* 2 bytes Start of frame (before ethernet header)
+	 * 2 bytes Data frame tail (after ethernet frame)
+	 * They are copied, but ignored.
+	 */
+	rxpkt = skb_put(skb, rxlen) - DET_SOF_LEN;
+	if (mse102x_rx_frame_spi(mse, rxpkt, rxlen, drop)) {
+		mse->ndev->stats.rx_errors++;
+		dev_kfree_skb(skb);
+		return IRQ_HANDLED;
+	}
+
+	if (netif_msg_pktdata(mse))
+		mse102x_dump_packet(__func__, skb->len, skb->data);
+
+	skb->protocol = eth_type_trans(skb, mse->ndev);
+	netif_rx(skb);
+
+	mse->ndev->stats.rx_packets++;
+	mse->ndev->stats.rx_bytes += rxlen;
+
+	return IRQ_HANDLED;
+}
+
+static int mse102x_tx_pkt_spi(struct mse102x_net *mse, struct sk_buff *txb,
+			      unsigned long work_timeout)
+{
+	unsigned int pad = 0;
+	__be16 rx = 0;
+	u16 cmd_resp;
+	int ret;
+	bool first = true;
+
+	if (txb->len < ETH_ZLEN)
+		pad = ETH_ZLEN - txb->len;
+
+	while (1) {
+		mse102x_tx_cmd_spi(mse, CMD_RTS | (txb->len + pad));
+		ret = mse102x_rx_cmd_spi(mse, (u8 *)&rx);
+		cmd_resp = be16_to_cpu(rx);
+
+		if (!ret) {
+			/* ready to send frame ? */
+			if (cmd_resp == CMD_CTR)
+				break;
+
+			net_dbg_ratelimited("%s: Unexpected response (0x%04x)\n",
+					    __func__, cmd_resp);
+			mse->stats.invalid_ctr++;
+		}
+
+		/* It's not predictable how long / many retries it takes to
+		 * send at least one packet, so TX timeouts are possible.
+		 * That's the reason why the netdev watchdog is not used here.
+		 */
+		if (time_after(jiffies, work_timeout))
+			return -ETIMEDOUT;
+
+		if (first) {
+			/* throttle at first issue */
+			netif_stop_queue(mse->ndev);
+			/* fast retry */
+			usleep_range(50, 100);
+			first = false;
+		} else {
+			msleep(20);
+		}
+	}
+
+	ret = mse102x_tx_frame_spi(mse, txb, pad);
+	if (ret)
+		net_dbg_ratelimited("%s: Failed to send (%d), drop frame\n",
+				    __func__, ret);
+
+	return ret;
+}
+
+#define TX_QUEUE_MAX 10
+
+static void mse102x_tx_work(struct work_struct *work)
+{
+	/* Make sure timeout is sufficient to transfer TX_QUEUE_MAX frames */
+	unsigned long work_timeout = jiffies + msecs_to_jiffies(1000);
+	struct mse102x_net_spi *mses;
+	struct mse102x_net *mse;
+	struct sk_buff *txb;
+	int ret = 0;
+
+	mses = container_of(work, struct mse102x_net_spi, tx_work);
+	mse = &mses->mse102x;
+
+	while ((txb = skb_dequeue(&mse->txq))) {
+		unsigned int len = max_t(unsigned int, txb->len, ETH_ZLEN);
+
+		mutex_lock(&mses->lock);
+		ret = mse102x_tx_pkt_spi(mse, txb, work_timeout);
+		mutex_unlock(&mses->lock);
+		if (ret) {
+			mse->ndev->stats.tx_dropped++;
+		} else {
+			mse->ndev->stats.tx_bytes += len;
+			mse->ndev->stats.tx_packets++;
+		}
+
+		dev_kfree_skb(txb);
+	}
+
+	if (ret == -ETIMEDOUT) {
+		if (netif_msg_timer(mse))
+			netdev_err_once(mse->ndev, "tx work timeout\n");
+
+		mse->stats.tx_timeout++;
+	}
+
+	netif_wake_queue(mse->ndev);
+}
+
+static netdev_tx_t mse102x_start_xmit_spi(struct sk_buff *skb,
+					  struct net_device *ndev)
+{
+	struct mse102x_net *mse = netdev_priv(ndev);
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+
+	netif_dbg(mse, tx_queued, ndev,
+		  "%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data);
+
+	skb_queue_tail(&mse->txq, skb);
+
+	if (skb_queue_len(&mse->txq) >= TX_QUEUE_MAX)
+		netif_stop_queue(ndev);
+
+	schedule_work(&mses->tx_work);
+
+	return NETDEV_TX_OK;
+}
+
+static void mse102x_init_mac(struct mse102x_net *mse, struct device_node *np)
+{
+	struct net_device *ndev = mse->ndev;
+	int ret = of_get_ethdev_address(np, ndev);
+
+	if (ret) {
+		eth_hw_addr_random(ndev);
+		dev_warn(ndev->dev.parent, "Using random MAC address: %pM\n",
+			 ndev->dev_addr);
+	}
+}
+
+/* Assumption: this is called for every incoming packet */
+static irqreturn_t mse102x_irq(int irq, void *_mse)
+{
+	struct mse102x_net *mse = _mse;
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+	irqreturn_t ret;
+
+	mutex_lock(&mses->lock);
+	ret = mse102x_rx_pkt_spi(mse);
+	mutex_unlock(&mses->lock);
+
+	return ret;
+}
+
+static int mse102x_net_open(struct net_device *ndev)
+{
+	struct irq_data *irq_data = irq_get_irq_data(ndev->irq);
+	struct mse102x_net *mse = netdev_priv(ndev);
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+	int ret;
+
+	if (!irq_data) {
+		netdev_err(ndev, "Invalid IRQ: %d\n", ndev->irq);
+		return -EINVAL;
+	}
+
+	switch (irqd_get_trigger_type(irq_data)) {
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		break;
+	default:
+		netdev_warn_once(ndev, "Only IRQ type level recommended, please update your device tree firmware.\n");
+		break;
+	}
+
+	ret = request_threaded_irq(ndev->irq, NULL, mse102x_irq, IRQF_ONESHOT,
+				   ndev->name, mse);
+	if (ret < 0) {
+		netdev_err(ndev, "Failed to get irq: %d\n", ret);
+		return ret;
+	}
+
+	netif_dbg(mse, ifup, ndev, "opening\n");
+
+	netif_start_queue(ndev);
+
+	netif_carrier_on(ndev);
+
+	/* The SPI interrupt can stuck in case of pending packet(s).
+	 * So poll for possible packet(s) to re-arm the interrupt.
+	 */
+	mutex_lock(&mses->lock);
+	if (mse102x_rx_pkt_spi(mse) == IRQ_NONE)
+		mse102x_rx_pkt_spi(mse);
+	mutex_unlock(&mses->lock);
+
+	netif_dbg(mse, ifup, ndev, "network device up\n");
+
+	return 0;
+}
+
+static int mse102x_net_stop(struct net_device *ndev)
+{
+	struct mse102x_net *mse = netdev_priv(ndev);
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+
+	netif_info(mse, ifdown, ndev, "shutting down\n");
+
+	netif_carrier_off(mse->ndev);
+
+	/* stop any outstanding work */
+	flush_work(&mses->tx_work);
+
+	netif_stop_queue(ndev);
+
+	skb_queue_purge(&mse->txq);
+
+	free_irq(ndev->irq, mse);
+
+	return 0;
+}
+
+static const struct net_device_ops mse102x_netdev_ops = {
+	.ndo_open		= mse102x_net_open,
+	.ndo_stop		= mse102x_net_stop,
+	.ndo_start_xmit		= mse102x_start_xmit_spi,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+/* ethtool support */
+
+static void mse102x_get_drvinfo(struct net_device *ndev,
+				struct ethtool_drvinfo *di)
+{
+	strscpy(di->driver, DRV_NAME, sizeof(di->driver));
+	strscpy(di->bus_info, dev_name(ndev->dev.parent), sizeof(di->bus_info));
+}
+
+static u32 mse102x_get_msglevel(struct net_device *ndev)
+{
+	struct mse102x_net *mse = netdev_priv(ndev);
+
+	return mse->msg_enable;
+}
+
+static void mse102x_set_msglevel(struct net_device *ndev, u32 to)
+{
+	struct mse102x_net *mse = netdev_priv(ndev);
+
+	mse->msg_enable = to;
+}
+
+static void mse102x_get_ethtool_stats(struct net_device *ndev,
+				      struct ethtool_stats *estats, u64 *data)
+{
+	struct mse102x_net *mse = netdev_priv(ndev);
+	struct mse102x_stats *st = &mse->stats;
+
+	memcpy(data, st, ARRAY_SIZE(mse102x_gstrings_stats) * sizeof(u64));
+}
+
+static void mse102x_get_strings(struct net_device *ndev, u32 stringset, u8 *buf)
+{
+	switch (stringset) {
+	case ETH_SS_STATS:
+		memcpy(buf, &mse102x_gstrings_stats,
+		       sizeof(mse102x_gstrings_stats));
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
+}
+
+static int mse102x_get_sset_count(struct net_device *ndev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return ARRAY_SIZE(mse102x_gstrings_stats);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct ethtool_ops mse102x_ethtool_ops = {
+	.get_drvinfo		= mse102x_get_drvinfo,
+	.get_link		= ethtool_op_get_link,
+	.get_msglevel		= mse102x_get_msglevel,
+	.set_msglevel		= mse102x_set_msglevel,
+	.get_ethtool_stats	= mse102x_get_ethtool_stats,
+	.get_strings		= mse102x_get_strings,
+	.get_sset_count		= mse102x_get_sset_count,
+};
+
+/* driver bus management functions */
+
+static int mse102x_suspend(struct device *dev)
+{
+	struct mse102x_net *mse = dev_get_drvdata(dev);
+	struct net_device *ndev = mse->ndev;
+
+	if (netif_running(ndev)) {
+		netif_device_detach(ndev);
+		mse102x_net_stop(ndev);
+	}
+
+	return 0;
+}
+
+static int mse102x_resume(struct device *dev)
+{
+	struct mse102x_net *mse = dev_get_drvdata(dev);
+	struct net_device *ndev = mse->ndev;
+
+	if (netif_running(ndev)) {
+		mse102x_net_open(ndev);
+		netif_device_attach(ndev);
+	}
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(mse102x_pm_ops, mse102x_suspend, mse102x_resume);
+
+static int mse102x_probe_spi(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct mse102x_net_spi *mses;
+	struct net_device *ndev;
+	struct mse102x_net *mse;
+	int ret;
+
+	spi->bits_per_word = 8;
+	spi->mode |= SPI_MODE_3;
+	/* enforce minimum speed to ensure device functionality */
+	spi->controller->min_speed_hz = MIN_FREQ_HZ;
+
+	if (!spi->max_speed_hz)
+		spi->max_speed_hz = MAX_FREQ_HZ;
+
+	if (spi->max_speed_hz < MIN_FREQ_HZ ||
+	    spi->max_speed_hz > MAX_FREQ_HZ) {
+		dev_err(&spi->dev, "SPI max frequency out of range (min: %u, max: %u)\n",
+			MIN_FREQ_HZ, MAX_FREQ_HZ);
+		return -EINVAL;
+	}
+
+	ret = spi_setup(spi);
+	if (ret < 0) {
+		dev_err(&spi->dev, "Unable to setup SPI device: %d\n", ret);
+		return ret;
+	}
+
+	ndev = devm_alloc_etherdev(dev, sizeof(struct mse102x_net_spi));
+	if (!ndev)
+		return -ENOMEM;
+
+	ndev->needed_tailroom += ALIGN(DET_DFT_LEN, 4);
+	ndev->needed_headroom += ALIGN(DET_SOF_LEN, 4);
+	ndev->priv_flags &= ~IFF_TX_SKB_SHARING;
+	ndev->tx_queue_len = 100;
+
+	mse = netdev_priv(ndev);
+	mses = to_mse102x_spi(mse);
+
+	mses->spidev = spi;
+	mutex_init(&mses->lock);
+	INIT_WORK(&mses->tx_work, mse102x_tx_work);
+
+	/* initialise pre-made spi transfer messages */
+	spi_message_init(&mses->spi_msg);
+	spi_message_add_tail(&mses->spi_xfer, &mses->spi_msg);
+
+	ndev->irq = spi->irq;
+	mse->ndev = ndev;
+
+	/* set the default message enable */
+	mse->msg_enable = netif_msg_init(-1, MSG_DEFAULT);
+
+	skb_queue_head_init(&mse->txq);
+
+	SET_NETDEV_DEV(ndev, dev);
+
+	dev_set_drvdata(dev, mse);
+
+	netif_carrier_off(mse->ndev);
+	ndev->netdev_ops = &mse102x_netdev_ops;
+	ndev->ethtool_ops = &mse102x_ethtool_ops;
+
+	mse102x_init_mac(mse, dev->of_node);
+
+	ret = register_netdev(ndev);
+	if (ret) {
+		dev_err(dev, "failed to register network device: %d\n", ret);
+		return ret;
+	}
+
+	mse102x_init_device_debugfs(mses);
+
+	return 0;
+}
+
+static void mse102x_remove_spi(struct spi_device *spi)
+{
+	struct mse102x_net *mse = dev_get_drvdata(&spi->dev);
+	struct mse102x_net_spi *mses = to_mse102x_spi(mse);
+
+	mse102x_remove_device_debugfs(mses);
+	unregister_netdev(mse->ndev);
+}
+
+static const struct of_device_id mse102x_match_table[] = {
+	{ .compatible = "vertexcom,mse1021" },
+	{ .compatible = "vertexcom,mse1022" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mse102x_match_table);
+
+static const struct spi_device_id mse102x_ids[] = {
+	{ "mse1021" },
+	{ "mse1022" },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, mse102x_ids);
+
+static struct spi_driver mse102x_driver = {
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table = mse102x_match_table,
+		.pm = pm_sleep_ptr(&mse102x_pm_ops),
+	},
+	.probe = mse102x_probe_spi,
+	.remove = mse102x_remove_spi,
+	.id_table = mse102x_ids,
+};
+module_spi_driver(mse102x_driver);
+
+MODULE_DESCRIPTION("MSE102x Network driver");
+MODULE_AUTHOR("Stefan Wahren <stefan.wahren@chargebyte.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:" DRV_NAME);