From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace 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 --- drivers/usb/misc/emi62.c | 272 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 272 insertions(+) create mode 100644 drivers/usb/misc/emi62.c (limited to 'drivers/usb/misc/emi62.c') diff --git a/drivers/usb/misc/emi62.c b/drivers/usb/misc/emi62.c new file mode 100644 index 000000000..3eea60437 --- /dev/null +++ b/drivers/usb/misc/emi62.c @@ -0,0 +1,272 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Emagic EMI 2|6 usb audio interface firmware loader. + * Copyright (C) 2002 + * Tapio Laxström (tapio.laxstrom@iptime.fi) + */ +#include +#include +#include +#include +#include +#include +#include +#include + +/* include firmware (variables)*/ + +/* FIXME: This is quick and dirty solution! */ +#define SPDIF /* if you want SPDIF comment next line */ +//#undef SPDIF /* if you want MIDI uncomment this line */ + +#ifdef SPDIF +#define FIRMWARE_FW "emi62/spdif.fw" +#else +#define FIRMWARE_FW "emi62/midi.fw" +#endif + +#define EMI62_VENDOR_ID 0x086a /* Emagic Soft-und Hardware GmBH */ +#define EMI62_PRODUCT_ID 0x0110 /* EMI 6|2m without firmware */ + +#define ANCHOR_LOAD_INTERNAL 0xA0 /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */ +#define ANCHOR_LOAD_EXTERNAL 0xA3 /* This command is not implemented in the core. Requires firmware */ +#define ANCHOR_LOAD_FPGA 0xA5 /* This command is not implemented in the core. Requires firmware. Emagic extension */ +#define MAX_INTERNAL_ADDRESS 0x1B3F /* This is the highest internal RAM address for the AN2131Q */ +#define CPUCS_REG 0x7F92 /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */ +#define INTERNAL_RAM(address) (address <= MAX_INTERNAL_ADDRESS) + +static int emi62_writememory(struct usb_device *dev, int address, + const unsigned char *data, int length, + __u8 bRequest); +static int emi62_set_reset(struct usb_device *dev, unsigned char reset_bit); +static int emi62_load_firmware (struct usb_device *dev); +static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id); +static void emi62_disconnect(struct usb_interface *intf); + +/* thanks to drivers/usb/serial/keyspan_pda.c code */ +static int emi62_writememory(struct usb_device *dev, int address, + const unsigned char *data, int length, + __u8 request) +{ + int result; + unsigned char *buffer = kmemdup(data, length, GFP_KERNEL); + + if (!buffer) { + dev_err(&dev->dev, "kmalloc(%d) failed.\n", length); + return -ENOMEM; + } + /* Note: usb_control_msg returns negative value on error or length of the + * data that was written! */ + result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300); + kfree (buffer); + return result; +} + +/* thanks to drivers/usb/serial/keyspan_pda.c code */ +static int emi62_set_reset (struct usb_device *dev, unsigned char reset_bit) +{ + int response; + dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit); + + response = emi62_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0); + if (response < 0) + dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit); + return response; +} + +#define FW_LOAD_SIZE 1023 + +static int emi62_load_firmware (struct usb_device *dev) +{ + const struct firmware *loader_fw = NULL; + const struct firmware *bitstream_fw = NULL; + const struct firmware *firmware_fw = NULL; + const struct ihex_binrec *rec; + int err = -ENOMEM; + int i; + __u32 addr; /* Address to write */ + __u8 *buf; + + dev_dbg(&dev->dev, "load_firmware\n"); + buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL); + if (!buf) + goto wraperr; + + err = request_ihex_firmware(&loader_fw, "emi62/loader.fw", &dev->dev); + if (err) + goto nofw; + + err = request_ihex_firmware(&bitstream_fw, "emi62/bitstream.fw", + &dev->dev); + if (err) + goto nofw; + + err = request_ihex_firmware(&firmware_fw, FIRMWARE_FW, &dev->dev); + if (err) { + nofw: + goto wraperr; + } + + /* Assert reset (stop the CPU in the EMI) */ + err = emi62_set_reset(dev,1); + if (err < 0) + goto wraperr; + + rec = (const struct ihex_binrec *)loader_fw->data; + + /* 1. We need to put the loader for the FPGA into the EZ-USB */ + while (rec) { + err = emi62_writememory(dev, be32_to_cpu(rec->addr), + rec->data, be16_to_cpu(rec->len), + ANCHOR_LOAD_INTERNAL); + if (err < 0) + goto wraperr; + rec = ihex_next_binrec(rec); + } + + /* De-assert reset (let the CPU run) */ + err = emi62_set_reset(dev,0); + if (err < 0) + goto wraperr; + msleep(250); /* let device settle */ + + /* 2. We upload the FPGA firmware into the EMI + * Note: collect up to 1023 (yes!) bytes and send them with + * a single request. This is _much_ faster! */ + rec = (const struct ihex_binrec *)bitstream_fw->data; + do { + i = 0; + addr = be32_to_cpu(rec->addr); + + /* intel hex records are terminated with type 0 element */ + while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) { + memcpy(buf + i, rec->data, be16_to_cpu(rec->len)); + i += be16_to_cpu(rec->len); + rec = ihex_next_binrec(rec); + } + err = emi62_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA); + if (err < 0) + goto wraperr; + } while (rec); + + /* Assert reset (stop the CPU in the EMI) */ + err = emi62_set_reset(dev,1); + if (err < 0) + goto wraperr; + + /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */ + for (rec = (const struct ihex_binrec *)loader_fw->data; + rec; rec = ihex_next_binrec(rec)) { + err = emi62_writememory(dev, be32_to_cpu(rec->addr), + rec->data, be16_to_cpu(rec->len), + ANCHOR_LOAD_INTERNAL); + if (err < 0) + goto wraperr; + } + + /* De-assert reset (let the CPU run) */ + err = emi62_set_reset(dev,0); + if (err < 0) + goto wraperr; + msleep(250); /* let device settle */ + + /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */ + + for (rec = (const struct ihex_binrec *)firmware_fw->data; + rec; rec = ihex_next_binrec(rec)) { + if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) { + err = emi62_writememory(dev, be32_to_cpu(rec->addr), + rec->data, be16_to_cpu(rec->len), + ANCHOR_LOAD_EXTERNAL); + if (err < 0) + goto wraperr; + } + } + + /* Assert reset (stop the CPU in the EMI) */ + err = emi62_set_reset(dev,1); + if (err < 0) + goto wraperr; + + for (rec = (const struct ihex_binrec *)firmware_fw->data; + rec; rec = ihex_next_binrec(rec)) { + if (INTERNAL_RAM(be32_to_cpu(rec->addr))) { + err = emi62_writememory(dev, be32_to_cpu(rec->addr), + rec->data, be16_to_cpu(rec->len), + ANCHOR_LOAD_EXTERNAL); + if (err < 0) + goto wraperr; + } + } + + /* De-assert reset (let the CPU run) */ + err = emi62_set_reset(dev,0); + if (err < 0) + goto wraperr; + msleep(250); /* let device settle */ + + release_firmware(loader_fw); + release_firmware(bitstream_fw); + release_firmware(firmware_fw); + + kfree(buf); + + /* return 1 to fail the driver inialization + * and give real driver change to load */ + return 1; + +wraperr: + if (err < 0) + dev_err(&dev->dev,"%s - error loading firmware: error = %d\n", + __func__, err); + release_firmware(loader_fw); + release_firmware(bitstream_fw); + release_firmware(firmware_fw); + + kfree(buf); + dev_err(&dev->dev, "Error\n"); + return err; +} + +static const struct usb_device_id id_table[] = { + { USB_DEVICE(EMI62_VENDOR_ID, EMI62_PRODUCT_ID) }, + { } /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE (usb, id_table); + +static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id) +{ + struct usb_device *dev = interface_to_usbdev(intf); + dev_dbg(&intf->dev, "emi62_probe\n"); + + dev_info(&intf->dev, "%s start\n", __func__); + + emi62_load_firmware(dev); + + /* do not return the driver context, let real audio driver do that */ + return -EIO; +} + +static void emi62_disconnect(struct usb_interface *intf) +{ +} + +static struct usb_driver emi62_driver = { + .name = "emi62 - firmware loader", + .probe = emi62_probe, + .disconnect = emi62_disconnect, + .id_table = id_table, +}; + +module_usb_driver(emi62_driver); + +MODULE_AUTHOR("Tapio Laxström"); +MODULE_DESCRIPTION("Emagic EMI 6|2m firmware loader."); +MODULE_LICENSE("GPL"); + +MODULE_FIRMWARE("emi62/loader.fw"); +MODULE_FIRMWARE("emi62/bitstream.fw"); +MODULE_FIRMWARE(FIRMWARE_FW); +/* vi:ai:syntax=c:sw=8:ts=8:tw=80 + */ -- cgit v1.3.1