tree 712f2616b235825d09dbb8e2df973e476db91c46
parent fbb92b6798894d3bf62fe3578d99fa62c720b242
author Kevin Wolf <kwolf@redhat.com> 1586261579 +0200
committer Kevin Wolf <kwolf@redhat.com> 1586266857 +0200

block: Fix blk->in_flight during blk_wait_while_drained()

Waiting in blk_wait_while_drained() while blk->in_flight is increased
for the current request is wrong because it will cause the drain
operation to deadlock.

This patch makes sure that blk_wait_while_drained() is called with
blk->in_flight increased exactly once for the current request, and that
it temporarily decreases the counter while it waits.

Fixes: cf3129323f900ef5ddbccbe86e4fa801e88c566e
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200407121259.21350-4-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>