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linux/drivers/usb/cdns3
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Ralph Siemsen a1059896f2 usb: cdns3: Fix deadlock when using NCM gadget 
The cdns3 driver has the same NCM deadlock as fixed in cdnsp by commit
58f2fcb3a8 ("usb: cdnsp: Fix deadlock issue during using NCM gadget").

Under PREEMPT_RT the deadlock can be readily triggered by heavy network
traffic, for example using "iperf --bidir" over NCM ethernet link.

The deadlock occurs because the threaded interrupt handler gets
preempted by a softirq, but both are protected by the same spinlock.
Prevent deadlock by disabling softirq during threaded irq handler.

Cc: stable <stable@kernel.org>
Fixes: 7733f6c32e ("usb: cdns3: Add Cadence USB3 DRD Driver")
Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
Acked-by: Peter Chen <peter.chen@kernel.org>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250318-rfs-cdns3-deadlock-v2-1-bfd9cfcee732@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2025-04-11 16:20:59 +02:00
..
Kconfig
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Makefile
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cdns3-debug.h
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cdns3-ep0.c
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cdns3-gadget.c usb: cdns3: Fix deadlock when using NCM gadget 2025-04-11 16:20:59 +02:00
cdns3-gadget.h
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cdns3-imx.c usb: Switch back to struct platform_driver::remove() 2024-10-04 15:13:03 +02:00
cdns3-pci-wrap.c usb: cdns3: Synchronise PCI IDs via common data base 2024-11-13 07:16:31 +01:00
cdns3-plat.c usb: Switch back to struct platform_driver::remove() 2024-10-04 15:13:03 +02:00
cdns3-starfive.c usb: Switch back to struct platform_driver::remove() 2024-10-04 15:13:03 +02:00
cdns3-ti.c usb: cdns3-ti: run HW init at resume() if HW was reset 2025-03-14 09:18:02 +01:00
cdns3-trace.c
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cdns3-trace.h
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cdnsp-debug.h
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cdnsp-ep0.c
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cdnsp-gadget.c usb: cdns3: rename hibernated argument of role->resume() to lost_power 2025-03-14 09:18:02 +01:00
cdnsp-gadget.h usb: cdnsp: fix for Link TRB with TC 2024-08-24 10:07:46 +08:00
cdnsp-mem.c
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cdnsp-pci.c usb: cdns3: Synchronise PCI IDs via common data base 2024-11-13 07:16:31 +01:00
cdnsp-ring.c usb: cdnsp: Fix incorrect usb_request status 2024-09-11 15:35:23 +02:00
cdnsp-trace.c
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cdnsp-trace.h
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core.c usb: cdns3: call cdns_power_is_lost() only once in cdns_resume() 2025-03-14 09:18:02 +01:00
core.h usb: cdns3: rename hibernated argument of role->resume() to lost_power 2025-03-14 09:18:02 +01:00
drd.c
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drd.h
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gadget-export.h
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host-export.h
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host.c usb: host: cdns3: forward lost power information to xhci 2025-03-14 09:18:03 +01:00