NVMe: Reduce maximum queue depth by 1

The spec says we're not allowed to completely fill the submission queue.
Solve this by reducing the number of allocatable cmdids by 1.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

parent d8ee9d69

drivers/block/nvme.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -156,7 +156,7 @@ static struct nvme_cmd_info nvme_cmd_info(struct nvme_queue nvmeq)
		static int alloc_cmdid(struct nvme_queue nvmeq, void ctx, int handler,
		unsigned timeout)
		{
		int depth = nvmeq->q_depth;
		int depth = nvmeq->q_depth - 1;
		struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
		int cmdid;