linux-stable.git/block/blk-exec.c, branch linux-2.6.34.y

fix crash in scsi_dispatch_cmd()

2014-02-10T21:11:15+00:00

commit bfe159a51203c15d23cb3158fffdc25ec4b4dda1 upstream.

USB surprise removal of sr is triggering an oops in
scsi_dispatch_command().  What seems to be happening is that USB is
hanging on to a queue reference until the last close of the upper
device, so the crash is caused by surprise remove of a mounted CD
followed by attempted unmount.

The problem is that USB doesn't issue its final commands as part of
the SCSI teardown path, but on last close when the block queue is long
gone.  The long term fix is probably to make sr do the teardown in the
same way as sd (so remove all the lower bits on ejection, but keep the
upper disk alive until last close of user space).  However, the
current oops can be simply fixed by not allowing any commands to be
sent to a dead queue.

Signed-off-by: James Bottomley 
Signed-off-by: Paul Gortmaker

block: don't set REQ_NOMERGE unnecessarily

2009-04-28T05:37:33+00:00

RQ_NOMERGE_FLAGS already clears defines which REQ flags aren't
mergeable.  There is no reason to specify it superflously.  It only
adds to confusion.  Don't set REQ_NOMERGE for barriers and requests
with specific queueing directive.  REQ_NOMERGE is now exclusively used
by the merging code.

[ Impact: cleanup ]

Signed-off-by: Tejun Heo

Add some block/ source files to the kernel-api docbook. Fix kernel-doc notation in them as needed. Fix changed function parameter names. Fix typos/spellos. In comments, change REQ_SPECIAL to REQ_TYPE_SPECIAL and REQ_BLOCK_PC to REQ_TYPE_BLOCK_PC.

2008-10-09T06:56:03+00:00

Signed-off-by: Randy Dunlap 
Signed-off-by: Jens Axboe

block: unexport blk_end_sync_rq

2008-07-15T19:21:45+00:00

All the users of blk_end_sync_rq has gone (they are converted to use
blk_execute_rq). This unexports blk_end_sync_rq.

Signed-off-by: FUJITA Tomonori 
Cc: Borislav Petkov 
Signed-off-by: Jens Axboe 
Signed-off-by: Bartlomiej Zolnierkiewicz

block: handle blk_pm_resume_request() requests in blk_execute_rq_nowait()

2008-07-15T19:21:43+00:00

For blk_pm_resume_request() requests (which are used only by IDE subsystem
currently) the queue is stopped so we need to call ->request_fn explicitly.

Thanks to:
- Rafael for reporting/bisecting the bug
- Borislav/Rafael for testing the fix

This is a preparation for converting IDE to use blk_execute_rq().

Cc: FUJITA Tomonori 
Cc: Borislav Petkov 
Cc: Jens Axboe 
Cc: "Rafael J. Wysocki" 
Signed-off-by: Bartlomiej Zolnierkiewicz

block: make core bits checkpatch compliant

2008-02-01T08:26:33+00:00

Signed-off-by: Jens Axboe

block: continue ll_rw_blk.c splitup

2008-01-29T20:55:08+00:00

Adds files for barrier handling, rq execution, io context handling,
mapping data to requests, and queue settings.

Signed-off-by: Jens Axboe