From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mikulas Patocka Subject: [PATCH 1/9] dm-integrity: change the variable suspending from bool to int Date: Wed, 06 Jun 2018 17:33:08 +0200 Message-ID: <20180606153431.226306753@debian.vm> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Return-path: Content-Disposition: inline; filename=dm-integrity-suspending.patch Sender: stable-owner@vger.kernel.org To: Mike Snitzer , Milan Broz Cc: dm-devel@redhat.com, Mikulas Patocka , stable@vger.kernel.org List-Id: dm-devel.ids The early alpha processors can't write a byte or short atomically - they read 8 bytes, modify the byte or two bytes in registers and write back 8 bytes. The modification of the variable "suspending" may race with modification of the variable "failed". This patch changes suspending to an int. Signed-off-by: Mikulas Patocka Cc: stable@vger.kernel.org --- drivers/md/dm-integrity.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) Index: linux-2.6/drivers/md/dm-integrity.c =================================================================== --- linux-2.6.orig/drivers/md/dm-integrity.c 2018-05-01 00:23:32.000000000 +0200 +++ linux-2.6/drivers/md/dm-integrity.c 2018-05-01 00:38:57.000000000 +0200 @@ -178,7 +178,7 @@ struct dm_integrity_c { __u8 sectors_per_block; unsigned char mode; - bool suspending; + int suspending; int failed; @@ -2210,7 +2210,7 @@ static void dm_integrity_postsuspend(str del_timer_sync(&ic->autocommit_timer); - ic->suspending = true; + WRITE_ONCE(ic->suspending, 1); queue_work(ic->commit_wq, &ic->commit_work); drain_workqueue(ic->commit_wq); @@ -2220,7 +2220,7 @@ static void dm_integrity_postsuspend(str dm_integrity_flush_buffers(ic); } - ic->suspending = false; + WRITE_ONCE(ic->suspending, 0); BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));