diff options
| author | Tejun Heo <tj@kernel.org> | 2011-12-15 20:03:04 +0100 |
|---|---|---|
| committer | Ziyan <jaraidaniel@gmail.com> | 2016-01-08 10:37:04 +0100 |
| commit | d293ca5facb1bb4c3a60bf287b51fbdd3c86ac85 (patch) | |
| tree | 289aee518fe38dfa7eeada1bd1f526f78768ccf4 /block | |
| parent | 02ab8685496603c74868e8fc91847cbe12d22a48 (diff) | |
| download | kernel_samsung_tuna-d293ca5facb1bb4c3a60bf287b51fbdd3c86ac85.zip kernel_samsung_tuna-d293ca5facb1bb4c3a60bf287b51fbdd3c86ac85.tar.gz kernel_samsung_tuna-d293ca5facb1bb4c3a60bf287b51fbdd3c86ac85.tar.bz2 | |
block: don't kick empty queue in blk_drain_queue()
While probing, fd sets up queue, probes hardware and tears down the
queue if probing fails. In the process, blk_drain_queue() kicks the
queue which failed to finish initialization and fd is unhappy about
that.
floppy0: no floppy controllers found
------------[ cut here ]------------
WARNING: at drivers/block/floppy.c:2929 do_fd_request+0xbf/0xd0()
Hardware name: To Be Filled By O.E.M.
VFS: do_fd_request called on non-open device
Modules linked in:
Pid: 1, comm: swapper Not tainted 3.2.0-rc4-00077-g5983fe2 #2
Call Trace:
[<ffffffff81039a6a>] warn_slowpath_common+0x7a/0xb0
[<ffffffff81039b41>] warn_slowpath_fmt+0x41/0x50
[<ffffffff813d657f>] do_fd_request+0xbf/0xd0
[<ffffffff81322b95>] blk_drain_queue+0x65/0x80
[<ffffffff81322c93>] blk_cleanup_queue+0xe3/0x1a0
[<ffffffff818a809d>] floppy_init+0xdeb/0xe28
[<ffffffff818a72b2>] ? daring+0x6b/0x6b
[<ffffffff810002af>] do_one_initcall+0x3f/0x170
[<ffffffff81884b34>] kernel_init+0x9d/0x11e
[<ffffffff810317c2>] ? schedule_tail+0x22/0xa0
[<ffffffff815dbb14>] kernel_thread_helper+0x4/0x10
[<ffffffff81884a97>] ? start_kernel+0x2be/0x2be
[<ffffffff815dbb10>] ? gs_change+0xb/0xb
Avoid it by making blk_drain_queue() kick queue iff dispatch queue has
something on it.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Ralf Hildebrandt <Ralf.Hildebrandt@charite.de>
Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Tested-by: Sergei Trofimovich <slyich@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 9b1f358..24fc99d 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -369,7 +369,14 @@ void blk_drain_queue(struct request_queue *q, bool drain_all) if (drain_all) blk_throtl_drain(q); - __blk_run_queue(q); + /* + * This function might be called on a queue which failed + * driver init after queue creation. Some drivers + * (e.g. fd) get unhappy in such cases. Kick queue iff + * dispatch queue has something on it. + */ + if (!list_empty(&q->queue_head)) + __blk_run_queue(q); drain |= q->rq.elvpriv; |