tree 586970f94cffed8c3fdff45fdce24746b59f1693
parent 9ca6a4d89872d6c1abb41ded2aa139b703d67ab2
author Oliver Neukum <oneukum@suse.com> 1586960270 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1588170694 +0200

UAS: fix deadlock in error handling and PM flushing work

commit f6cc6093a729ede1ff5658b493237c42b82ba107 upstream.

A SCSI error handler and block runtime PM must not allocate
memory with GFP_KERNEL. Furthermore they must not wait for
tasks allocating memory with GFP_KERNEL.
That means that they cannot share a workqueue with arbitrary tasks.

Fix this for UAS using a private workqueue.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Fixes: f9dc024a2da1f ("uas: pre_reset and suspend: Fix a few races")
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200415141750.811-2-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>