[PATCH v6 0/5] Fix potential kernel panic when increase hardware queue

[Weiping Zhang <zhangweiping@didiglobal.com>]

Hi,

This series mainly fix the kernel panic when increase hardware queue,
and also fix some other misc issue.

Memleak 1:

__blk_mq_alloc_rq_maps
	__blk_mq_alloc_rq_map

if fail
	blk_mq_free_rq_map

Actually, __blk_mq_alloc_rq_map alloc both map and request, here
also need free request.


Patch1: fix Memleak 1.
Patch2: fix prev_nr_hw_queues issue, need be saved before change.
Patch3: From Ming, fix potential kernel panic when increase hardware queue.
Patch4~5: rename two function, because these two function alloc both
map and request, and keep in pair with blk_mq_free_map_and_request(s).

Changes since V5:
 * fix 80 char per line for patch-4

Changes since V4:
 * use another way to fix kernel panic when increase hardware queue,
   this patch from Ming.

Changes since V3:
* record patchset, fix issue fistly then rename.
* rename function to blk_mq_alloc_map_and_request

Changes since V2:
 * rename some functions name and fix memleak when free map and requests
 * Not free new allocated map and request, they will be relased when tagset gone

Changes since V1:
 * Add fix for potential kernel panic when increase hardware queue

Ming Lei (1):
  block: alloc map and request for new hardware queue

Weiping Zhang (4):
  block: free both rq_map and request
  block: save previous hardware queue count before udpate
  block: rename __blk_mq_alloc_rq_map
  block: rename blk_mq_alloc_rq_maps

 block/blk-mq.c | 37 +++++++++++++++++++------------------
 1 file changed, 19 insertions(+), 18 deletions(-)

-- 
2.18.2