Jerome Brunet 38203b8385 usb: cdc-acm: fix cooldown mechanism ... Commit a4e7279cd1 ("cdc-acm: introduce a cool down") is causing regression if there is some USB error, such as -EPROTO. This has been reported on some samples of the Odroid-N2 using the Combee II Zibgee USB dongle. > struct acm *acm = container_of(work, struct acm, work) is incorrect in case of a delayed work and causes warnings, usually from the workqueue: > WARNING: CPU: 0 PID: 0 at kernel/workqueue.c:1474 __queue_work+0x480/0x528. When this happens, USB eventually stops working completely after a while. Also the ACM_ERROR_DELAY bit is never set, so the cooldown mechanism previously introduced cannot be triggered and acm_submit_read_urb() is never called. This changes makes the cdc-acm driver use a single delayed work, fixing the pointer arithmetic in acm_softint() and set the ACM_ERROR_DELAY when the cooldown mechanism appear to be needed. Fixes: a4e7279cd1 ("cdc-acm: introduce a cool down") Cc: Oliver Neukum <oneukum@suse.com> Reported-by: Pascal Vizeli <pascal.vizeli@nabucasa.com> Acked-by: Oliver Neukum <oneukum@suse.com> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Link: https://lore.kernel.org/r/20201019170702.150534-1-jbrunet@baylibre.com Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-10-28 13:20:21 +01:00
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cdc-acm.c	usb: cdc-acm: fix cooldown mechanism	2020-10-28 13:20:21 +01:00
cdc-acm.h	usb: cdc-acm: fix cooldown mechanism	2020-10-28 13:20:21 +01:00
cdc-wdm.c	USB: cdc-wdm: Make wdm_flush() interruptible and add wdm_fsync().	2020-10-02 11:30:10 +02:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	USB: add SPDX identifiers to all remaining Makefiles	2017-11-07 15:53:48 +01:00
usblp.c	usblp: fix race between disconnect() and read()	2020-09-17 18:45:30 +02:00
usbtmc.c	usb: Use fallthrough pseudo-keyword	2020-07-10 08:55:17 +02:00