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nvme: fix sqhd reference when admin queue connect fails 

Fix bug in sqhd patch.

It wasn't the sq that was at risk. In the case where the admin queue
connect command fails, the sq->size field is not set. Therefore, this
becomes a divide by zero error.

Add a quick check to bypass under this failure condition.

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
James Smart 2017-09-21 08:13:49 -07:00 committed by Jens Axboe
parent f5c156c4c2
commit 8cbd96a628
1 changed files with 2 additions and 1 deletions
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3
drivers/nvme/target/core.c
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@ -390,7 +390,8 @@ static void __nvmet_req_complete(struct nvmet_req *req, u16 status)
if (status)
nvmet_set_status(req, status);
req->sq->sqhd = (req->sq->sqhd + 1) % req->sq->size;
if (req->sq->size)
req->sq->sqhd = (req->sq->sqhd + 1) % req->sq->size;
req->rsp->sq_head = cpu_to_le16(req->sq->sqhd);
req->rsp->sq_id = cpu_to_le16(req->sq->qid);
req->rsp->command_id = req->cmd->common.command_id;