Dan Williams f2b20d4365 block: fix blk_queue_end_tag() ... Commit 5e081591 "block: warn if tag is greater than real_max_depth" cleaned up blk_queue_end_tag() to warn when the tag is truly invalid (greater than real_max_depth). However, it changed behavior in the tag < max_depth case to not end the request. Leading to triggering of BUG_ON(blk_queued_rq(rq)) in the request completion path: http://marc.info/?l=linux-kernel&m=132204370518629&w=2 In order to allow blk_queue_resize_tags() to shrink the tag space blk_queue_end_tag() must always complete tags with a value less than real_max_depth regardless of the current max_depth. The comment about "handling the shrink case" seems to be what prompted changes in this space, so remove it and BUG on all invalid tags (made even simpler by Matthew's suggestion to use an unsigned compare). Signed-off-by: Dan Williams <dan.j.williams@intel.com> Cc: Tao Ma <boyu.mt@taobao.com> Cc: Matthew Wilcox <matthew@wil.cx> Reported-by: Meelis Roos <mroos@ut.ee> Reported-by: Ed Nadolski <edmund.nadolski@intel.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2011-12-29 09:16:28 +01:00
..
blk-cgroup.c
blk-cgroup.h
blk-core.c	block: don't kick empty queue in blk_drain_queue()	2011-12-15 20:03:04 +01:00
blk-exec.c
blk-flush.c
blk-integrity.c
blk-ioc.c
blk-iopoll.c
blk-lib.c
blk-map.c	block: re-use existing 'reading' variable instead of checking direction again	2011-12-21 15:27:24 +01:00
blk-merge.c
blk-settings.c
blk-softirq.c
blk-sysfs.c
blk-tag.c	block: fix blk_queue_end_tag()	2011-12-29 09:16:28 +01:00
blk-throttle.c
blk-timeout.c
blk.h
bsg-lib.c
bsg.c
cfq-iosched.c	block, cfq: fix empty queue crash caused by request merge	2011-12-16 14:04:23 +01:00
cfq.h
compat_ioctl.c
deadline-iosched.c
elevator.c
genhd.c
ioctl.c
Kconfig
Kconfig.iosched
Makefile
noop-iosched.c
scsi_ioctl.c