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nvme: switch abort_limit to an atomic_t

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There is no lock to sychronize access to the abort_limit field of
struct nvme_ctrl, so switch it to an atomic_t.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2015-11-20 09:36:44 +01:00 committed by Jens Axboe
parent 5c8809e650
commit 6bf25d1641
3 changed files with 7 additions and 6 deletions
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2
drivers/nvme/host/core.c
View File

@ -839,7 +839,7 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
}
ctrl->oncs = le16_to_cpup(&id->oncs);
ctrl->abort_limit = id->acl + 1;
atomic_set(&ctrl->abort_limit, id->acl + 1);
ctrl->vwc = id->vwc;
memcpy(ctrl->serial, id->sn, sizeof(id->sn));
memcpy(ctrl->model, id->mn, sizeof(id->mn));

2
drivers/nvme/host/nvme.h
View File

@ -77,7 +77,7 @@ struct nvme_ctrl {
u32 max_hw_sectors;
u32 stripe_size;
u16 oncs;
u16 abort_limit;
atomic_t abort_limit;
u8 event_limit;
u8 vwc;
u32 vs;

9
drivers/nvme/host/pci.c
View File

@ -388,7 +388,7 @@ static void abort_completion(struct nvme_queue *nvmeq, void *ctx,
blk_mq_free_request(req);
dev_warn(nvmeq->q_dmadev, "Abort status:%x result:%x", status, result);
++nvmeq->dev->ctrl.abort_limit;
atomic_inc(&nvmeq->dev->ctrl.abort_limit);
}
static void async_completion(struct nvme_queue *nvmeq, void *ctx,
@ -1124,13 +1124,15 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
return BLK_EH_HANDLED;
}
if (!dev->ctrl.abort_limit)
if (atomic_dec_and_test(&dev->ctrl.abort_limit))
return BLK_EH_RESET_TIMER;
abort_req = blk_mq_alloc_request(dev->ctrl.admin_q, WRITE,
BLK_MQ_REQ_NOWAIT);
if (IS_ERR(abort_req))
if (IS_ERR(abort_req)) {
atomic_inc(&dev->ctrl.abort_limit);
return BLK_EH_RESET_TIMER;
}
abort_cmd = blk_mq_rq_to_pdu(abort_req);
nvme_set_info(abort_cmd, abort_req, abort_completion);
@ -1141,7 +1143,6 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
cmd.abort.sqid = cpu_to_le16(nvmeq->qid);
cmd.abort.command_id = abort_req->tag;
--dev->ctrl.abort_limit;
cmd_rq->aborted = 1;
dev_warn(nvmeq->q_dmadev, "I/O %d QID %d timeout, aborting\n",