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45eae113dc
This commit addresses a rarely observed endpoint command timeout
which causes kernel panic due to warn when 'panic_on_warn' is enabled
and unnecessary call trace prints when 'panic_on_warn' is disabled.
It is seen during fast software-controlled connect/disconnect testcases.
The following is one such endpoint command timeout that we observed:
1. Connect
=======
->dwc3_thread_interrupt
->dwc3_ep0_interrupt
->configfs_composite_setup
->composite_setup
->usb_ep_queue
->dwc3_gadget_ep0_queue
->__dwc3_gadget_ep0_queue
->__dwc3_ep0_do_control_data
->dwc3_send_gadget_ep_cmd
2. Disconnect
==========
->dwc3_thread_interrupt
->dwc3_gadget_disconnect_interrupt
->dwc3_ep0_reset_state
->dwc3_ep0_end_control_data
->dwc3_send_gadget_ep_cmd
In the issue scenario, in Exynos platforms, we observed that control
transfers for the previous connect have not yet been completed and end
transfer command sent as a part of the disconnect sequence and
processing of USB_ENDPOINT_HALT feature request from the host timeout.
This maybe an expected scenario since the controller is processing EP
commands sent as a part of the previous connect. It maybe better to
remove WARN_ON in all places where device endpoint commands are sent to
avoid unnecessary kernel panic due to warn.
Cc: stable <stable@kernel.org>
Co-developed-by: Akash M <akash.m5@samsung.com>
Signed-off-by: Akash M <akash.m5@samsung.com>
Signed-off-by: Selvarasu Ganesan <selvarasu.g@samsung.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250808125315.1607-1-selvarasu.g@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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|---|---|---|
| .. | ||
| core.c | ||
| core.h | ||
| debug.h | ||
| debugfs.c | ||
| drd.c | ||
| dwc3-am62.c | ||
| dwc3-exynos.c | ||
| dwc3-haps.c | ||
| dwc3-imx8mp.c | ||
| dwc3-keystone.c | ||
| dwc3-meson-g12a.c | ||
| dwc3-octeon.c | ||
| dwc3-of-simple.c | ||
| dwc3-omap.c | ||
| dwc3-pci.c | ||
| dwc3-qcom-legacy.c | ||
| dwc3-qcom.c | ||
| dwc3-rtk.c | ||
| dwc3-st.c | ||
| dwc3-xilinx.c | ||
| ep0.c | ||
| gadget.c | ||
| gadget.h | ||
| glue.h | ||
| host.c | ||
| io.h | ||
| Kconfig | ||
| Makefile | ||
| trace.c | ||
| trace.h | ||
| ulpi.c | ||