NVMe: Fix memory leak on retried commands
commit 0dfc70c3 upstream. Resources are reallocated for requeued commands, so unmap and release the iod for the failed command. It's a pretty bad memory leak and causes a kernel hang if you remove a drive because of a busy dma pool. You'll get messages spewing like this: nvme 0000:xx:xx.x: dma_pool_destroy prp list 256, ffff880420dec000 busy and lock up pci and the driver since removal never completes while holding a lock. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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