From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50564 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750915AbdHaGU6 (ORCPT ); Thu, 31 Aug 2017 02:20:58 -0400 Subject: Patch "scsi: sg: reset 'res_in_use' after unlinking reserved array" has been added to the 4.9-stable tree To: hare@suse.de, gregkh@linuxfoundation.org, hare@suse.com, hch@lst.de, jthumshirn@suse.de, martin.petersen@oracle.com, toddpoynor@google.com Cc: , From: Date: Thu, 31 Aug 2017 08:20:52 +0200 Message-ID: <150416045235228@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled scsi: sg: reset 'res_in_use' after unlinking reserved array to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: scsi-sg-reset-res_in_use-after-unlinking-reserved-array.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From e791ce27c3f6a1d3c746fd6a8f8e36c9540ec6f9 Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Mon, 24 Apr 2017 10:26:36 +0200 Subject: scsi: sg: reset 'res_in_use' after unlinking reserved array From: Hannes Reinecke commit e791ce27c3f6a1d3c746fd6a8f8e36c9540ec6f9 upstream. Once the reserved page array is unused we can reset the 'res_in_use' state; here we can do a lazy update without holding the mutex as we only need to check against concurrent access, not concurrent release. [mkp: checkpatch] Fixes: 1bc0eb044615 ("scsi: sg: protect accesses to 'reserved' page array") Signed-off-by: Hannes Reinecke Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig Signed-off-by: Martin K. Petersen Cc: Todd Poynor Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/sg.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -2042,6 +2042,8 @@ sg_unlink_reserve(Sg_fd * sfp, Sg_reques req_schp->sglist_len = 0; sfp->save_scat_len = 0; srp->res_used = 0; + /* Called without mutex lock to avoid deadlock */ + sfp->res_in_use = 0; } static Sg_request * Patches currently in stable-queue which might be from hare@suse.de are queue-4.9/scsi-sg-protect-accesses-to-reserved-page-array.patch queue-4.9/scsi-sg-reset-res_in_use-after-unlinking-reserved-array.patch