usb: core: hcd: fix possible deadlock in rh control transfers

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>From within the SCSI error handler memory allocations must not
trigger IO. Handling errors in UAS and the storage driver may
involve resetting a device. The thread doing the reset itself
relies on VM magic. However, that is insufficient, as resetting
a device involves resuming it. Resumption as well as resetting
involves conrol transfers to the parent of the device to be reset.
That may be a root hub. Hence usbcore must heed the flags passed
to usb_submit_urb() processing control transfers to root hubs.

The problem exist since the storage driver has been merged.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://patch.msgid.link/20260429094413.181038-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Oliver Neukum 2026-04-29 11:44:04 +02:00 • committed by Greg Kroah-Hartman

parent dd0c03d685

commit d5559f43d7

1 changed files with 8 additions and 6 deletions

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drivers/usb/core/hcd.c

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