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

1 files changed, 229 insertions, 0 deletions

diff --git a/drivers/scsi/qlogicfas.c b/drivers/scsi/qlogicfas.c
new file mode 100644
index 000000000..8f05e3707
--- /dev/null
+++ b/drivers/scsi/qlogicfas.c
@@ -0,0 +1,229 @@
+/*
+ * Qlogic FAS408 ISA card driver
+ *
+ * Copyright 1994, Tom Zerucha.   
+ * tz@execpc.com
+ * 
+ * Redistributable under terms of the GNU General Public License
+ *
+ * For the avoidance of doubt the "preferred form" of this code is one which
+ * is in an open non patent encumbered format. Where cryptographic key signing
+ * forms part of the process of creating an executable the information
+ * including keys needed to generate an equivalently functional executable
+ * are deemed to be part of the source code.
+ *
+ * Check qlogicfas408.c for more credits and info.
+ */
+
+#include <linux/module.h>
+#include <linux/blkdev.h>		/* to get disk capacity */
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/unistd.h>
+#include <linux/spinlock.h>
+#include <linux/stat.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include "qlogicfas408.h"
+
+/* Set the following to 2 to use normal interrupt (active high/totempole-
+ * tristate), otherwise use 0 (REQUIRED FOR PCMCIA) for active low, open
+ * drain
+ */
+#define INT_TYPE	2
+
+static char qlogicfas_name[] = "qlogicfas";
+
+/*
+ *	Look for qlogic card and init if found 
+ */
+ 
+static struct Scsi_Host *__qlogicfas_detect(struct scsi_host_template *host,
+								int qbase,
+								int qlirq)
+{
+	int qltyp;		/* type of chip */
+	int qinitid;
+	struct Scsi_Host *hreg;	/* registered host structure */
+	struct qlogicfas408_priv *priv;
+
+	/*	Qlogic Cards only exist at 0x230 or 0x330 (the chip itself
+	 *	decodes the address - I check 230 first since MIDI cards are
+	 *	typically at 0x330
+	 *
+	 *	Theoretically, two Qlogic cards can coexist in the same system.
+	 *	This should work by simply using this as a loadable module for
+	 *	the second card, but I haven't tested this.
+	 */
+
+	if (!qbase || qlirq == -1)
+		goto err;
+
+	if (!request_region(qbase, 0x10, qlogicfas_name)) {
+		printk(KERN_INFO "%s: address %#x is busy\n", qlogicfas_name,
+							      qbase);
+		goto err;
+	}
+
+	if (!qlogicfas408_detect(qbase, INT_TYPE)) {
+		printk(KERN_WARNING "%s: probe failed for %#x\n",
+								qlogicfas_name,
+								qbase);
+		goto err_release_mem;
+	}
+
+	printk(KERN_INFO "%s: Using preset base address of %03x,"
+			 " IRQ %d\n", qlogicfas_name, qbase, qlirq);
+
+	qltyp = qlogicfas408_get_chip_type(qbase, INT_TYPE);
+	qinitid = host->this_id;
+	if (qinitid < 0)
+		qinitid = 7;	/* if no ID, use 7 */
+
+	qlogicfas408_setup(qbase, qinitid, INT_TYPE);
+
+	hreg = scsi_host_alloc(host, sizeof(struct qlogicfas408_priv));
+	if (!hreg)
+		goto err_release_mem;
+	priv = get_priv_by_host(hreg);
+	hreg->io_port = qbase;
+	hreg->n_io_port = 16;
+	hreg->dma_channel = -1;
+	if (qlirq != -1)
+		hreg->irq = qlirq;
+	priv->qbase = qbase;
+	priv->qlirq = qlirq;
+	priv->qinitid = qinitid;
+	priv->shost = hreg;
+	priv->int_type = INT_TYPE;
+
+	sprintf(priv->qinfo,
+		"Qlogicfas Driver version 0.46, chip %02X at %03X, IRQ %d, TPdma:%d",
+		qltyp, qbase, qlirq, QL_TURBO_PDMA);
+	host->name = qlogicfas_name;
+
+	if (request_irq(qlirq, qlogicfas408_ihandl, 0, qlogicfas_name, hreg))
+		goto free_scsi_host;
+
+	if (scsi_add_host(hreg, NULL))
+		goto free_interrupt;
+
+	scsi_scan_host(hreg);
+
+	return hreg;
+
+free_interrupt:
+	free_irq(qlirq, hreg);
+
+free_scsi_host:
+	scsi_host_put(hreg);
+
+err_release_mem:
+	release_region(qbase, 0x10);
+err:
+	return NULL;
+}
+
+#define MAX_QLOGICFAS	8
+static struct qlogicfas408_priv *cards;
+static int iobase[MAX_QLOGICFAS];
+static int irq[MAX_QLOGICFAS] = { [0 ... MAX_QLOGICFAS-1] = -1 };
+module_param_hw_array(iobase, int, ioport, NULL, 0);
+module_param_hw_array(irq, int, irq, NULL, 0);
+MODULE_PARM_DESC(iobase, "I/O address");
+MODULE_PARM_DESC(irq, "IRQ");
+
+static int qlogicfas_detect(struct scsi_host_template *sht)
+{
+	struct Scsi_Host *shost;
+	struct qlogicfas408_priv *priv;
+	int num;
+
+	for (num = 0; num < MAX_QLOGICFAS; num++) {
+		shost = __qlogicfas_detect(sht, iobase[num], irq[num]);
+		if (shost == NULL) {
+			/* no more devices */
+			break;
+		}
+		priv = get_priv_by_host(shost);
+		priv->next = cards;
+		cards = priv;
+	}
+
+	return num;
+}
+
+static int qlogicfas_release(struct Scsi_Host *shost)
+{
+	struct qlogicfas408_priv *priv = get_priv_by_host(shost);
+
+	scsi_remove_host(shost);
+	if (shost->irq) {
+		qlogicfas408_disable_ints(priv);	
+		free_irq(shost->irq, shost);
+	}
+	if (shost->io_port && shost->n_io_port)
+		release_region(shost->io_port, shost->n_io_port);
+	scsi_host_put(shost);
+
+	return 0;
+}
+
+/*
+ *	The driver template is also needed for PCMCIA
+ */
+static struct scsi_host_template qlogicfas_driver_template = {
+	.module			= THIS_MODULE,
+	.name			= qlogicfas_name,
+	.proc_name		= qlogicfas_name,
+	.info			= qlogicfas408_info,
+	.queuecommand		= qlogicfas408_queuecommand,
+	.eh_abort_handler	= qlogicfas408_abort,
+	.eh_host_reset_handler	= qlogicfas408_host_reset,
+	.bios_param		= qlogicfas408_biosparam,
+	.can_queue		= 1,
+	.this_id		= -1,
+	.sg_tablesize		= SG_ALL,
+	.dma_boundary		= PAGE_SIZE - 1,
+};
+
+static __init int qlogicfas_init(void)
+{
+	if (!qlogicfas_detect(&qlogicfas_driver_template)) {
+		/* no cards found */
+		printk(KERN_INFO "%s: no cards were found, please specify "
+				 "I/O address and IRQ using iobase= and irq= "
+				 "options", qlogicfas_name);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static __exit void qlogicfas_exit(void)
+{
+	struct qlogicfas408_priv *priv;
+
+	for (priv = cards; priv != NULL; priv = priv->next)
+		qlogicfas_release(priv->shost);
+}
+
+MODULE_AUTHOR("Tom Zerucha, Michael Griffith");
+MODULE_DESCRIPTION("Driver for the Qlogic FAS408 based ISA card");
+MODULE_LICENSE("GPL");
+module_init(qlogicfas_init);
+module_exit(qlogicfas_exit);
+