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Once IR blasting or mceusb device commands fail with mce_async_callback()
TX -EPIPE error, all subsequent TX to device then fail with the same error.
...
[ 249.986174] mceusb 1-1.2:1.0: requesting 38000 HZ carrier
[ 249.986210] mceusb 1-1.2:1.0: send request called (size=0x4)
[ 249.986256] mceusb 1-1.2:1.0: send request complete (res=0)
[ 249.986403] mceusb 1-1.2:1.0: Error: request urb status = -32 (TX HALT)
[ 249.999885] mceusb 1-1.2:1.0: send request called (size=0x3)
[ 249.999929] mceusb 1-1.2:1.0: send request complete (res=0)
[ 250.000013] mceusb 1-1.2:1.0: Error: request urb status = -32 (TX HALT)
[ 250.019830] mceusb 1-1.2:1.0: send request called (size=0x21)
[ 250.019868] mceusb 1-1.2:1.0: send request complete (res=0)
[ 250.020007] mceusb 1-1.2:1.0: Error: request urb status = -32 (TX HALT)
...
Fault simulation/injection is by executing the following USB operation
in a mceusb instrumented driver, prior to TX I/O.
retval = usb_control_msg(ir->usbdev, usb_sndctrlpipe(ir->usbdev, 0),
USB_REQ_SET_FEATURE, USB_RECIP_ENDPOINT,
USB_ENDPOINT_HALT, usb_pipeendpoint(ir->pipe_out),
NULL, 0, USB_CTRL_SET_TIMEOUT);
dev_dbg(ir->dev, "set halt retval, %d", retval);
After setting halt state for the TX endpoint, perform an lirc "irsend"
to generate TX traffic to device. After the TX HALT, the patch restores
subsequent TX to working state.
...
[ 508.009638] mceusb 1-1.2:1.0: send request called (size=0x3)
[ 508.009697] mceusb 1-1.2:1.0: send request complete (res=0)
[ 508.009847] mce_async_callback()
[ 508.009864] mceusb 1-1.2:1.0: Error: request urb status = -32 (TX HALT)
[ 508.009890] mceusb 1-1.2:1.0: kevent 0 scheduled
[ 508.021552] mceusb 1-1.2:1.0: send request called (size=0x21)
[ 508.021598] mceusb 1-1.2:1.0: send request complete (res=0)
[ 508.021963] mce_async_callback()
[ 508.021981] mceusb 1-1.2:1.0: tx data: 84 b0 0c 8c 0c 84 8c 0c 8c 0c 84 8c 0c 8c 0c 84 98 0c 98 0c 84 98 0c 8c 0c 84 8c 0c 8c 0c 81 8c 80 (length=33)
[ 508.021997] mceusb 1-1.2:1.0: Raw IR data, 0 pulse/space samples
[ 508.066627] mceusb 1-1.2:1.0: send request called (size=0x3)
[ 508.066669] mceusb 1-1.2:1.0: send request complete (res=0)
[ 508.066841] mce_async_callback()
[ 508.066858] mceusb 1-1.2:1.0: tx data: 9f 08 03 (length=3)
...
Signed-off-by: A Sun <as1033x@comcast.net>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.