There could be request timeout when the reset is ongoing.
nvme_timeout will not only meet the admin requests from the
initializing procedure, but also the IO and admin requests
from previous work before nvme_dev_disable is invoked. These
requests should be handled separately.
We could distinguish them through the ctrl->state.
If the state is NVME_CTRL_RESET_PREPARE, handle the expried
requests as nvme_cancel_request.
If the state is NVME_CTRL_RESETTING, the requests should be
from the initializing procedure. Handle them as before. Because the
nvme_reset_work will see the error and disable the dev itself, so
discard the nvme_dev_disable here.
Signed-off-by: Jianchao Wang <jianchao.w.w...@oracle.com>
---
drivers/nvme/host/pci.c | 29 ++++++++++++++++++++---------
1 file changed, 20 insertions(+), 9 deletions(-)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index f4b47b9..f3f6113 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1210,18 +1210,24 @@ static enum blk_eh_timer_return nvme_timeout(struct
request *req, bool reserved)
}
/*
- * Shutdown immediately if controller times out while starting. The
- * reset work will see the pci device disabled when it gets the forced
- * cancellation error. All outstanding requests are completed on
- * shutdown, so we return BLK_EH_HANDLED.
+ * There could be two kinds of expired reqs when reset is ongoing.
+ * Outstanding IO or admin requests from previous work before the
+ * nvme_reset_work invokes nvme_dev_disable. Handle them as the
+ * nvme_cancel_request. Outstanding admin requests from the
+ * initializing procedure. Set NVME_REQ_CANCELLED flag on them,
+ * then nvme_reset_work will see the error, then disable the device
+ * and remove the ctrl.
*/
- if (dev->ctrl.state == NVME_CTRL_RESETTING) {
- dev_warn(dev->ctrl.device,
- "I/O %d QID %d timeout, disable controller\n",
- req->tag, nvmeq->qid);
- nvme_dev_disable(dev, false);
+ switch (dev->ctrl.state) {
+ case NVME_CTRL_RESET_PREPARE:
+ nvme_req(req)->status = NVME_SC_ABORT_REQ;
+ return BLK_EH_HANDLED;
+ case NVME_CTRL_RESETTING:
+ WARN_ON_ONCE(nvmeq->qid);
nvme_req(req)->flags |= NVME_REQ_CANCELLED;
return BLK_EH_HANDLED;
+ default:
+ break;
}
/*
@@ -2316,6 +2322,11 @@ static void nvme_reset_work(struct work_struct *work)
if (dev->ctrl.ctrl_config & NVME_CC_ENABLE)
nvme_dev_disable(dev, false);
+ /*
+ * After this, all the outstanding requests must have been handled by
+ * nvme_cancel_request. This could ensure the nvme_timeout do the right
+ * thing. More details, please refer to the comment in nvme_timeout.
+ */
if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_RESETTING)) {
WARN_ON_ONCE(dev->ctrl.state != NVME_CTRL_DELETING);
goto out;
--
2.7.4
