[dm-devel] [PATCH V4 0/2] block/scsi/dm-rq: fix leak of request private data in dm-mpath

[Jens Axboe]

On 7/24/19 7:04 PM, Ming Lei wrote:
> Hi,
> 
> When one request is dispatched to LLD via dm-rq, if the result is
> BLK_STS_*RESOURCE, dm-rq will free the request. However, LLD may allocate
> private data for this request, so this way will cause memory leak.
> 
> Add .cleanup_rq() callback and implement it in SCSI for fixing the issue,
> since SCSI is the only driver which allocates private requst data in
> .queue_rq() path.
> 
> Another use case of this callback is to free the request and re-submit
> bios during cpu hotplug when the hctx is dead, see the following link:
> 
> https://lore.kernel.org/linux-block/f122e8f2-5ede-2d83-9ca0-bc713ce66d01@huawei.com/T/#t

Applied for 5.4, thanks.

-- 
Jens Axboe