tree f8ef88a7710600ead9bcf533bd7f34618ee4a9b3
parent bda4e0fb3126aca15586d165b5a15a37edc0a984
author Akinobu Mita <akinobu.mita@gmail.com> 1443287359 +0900
committer Jens Axboe <axboe@fb.com> 1443547963 -0600

blk-mq: avoid setting hctx->tags->cpumask before allocation

When unmapped hw queue is remapped after CPU topology is changed,
hctx->tags->cpumask has to be set after hctx->tags is setup in
blk_mq_map_swqueue(), otherwise it causes null pointer dereference.

Fixes: f26cdc8536 ("blk-mq: Shared tag enhancements")
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>