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NVMe: Skip async events for degraded controllers 

If the controller is degraded, the driver should stay out of the way so
the user can recover the drive. This patch skips driver initiated async
event requests when the drive is in this state.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2016-04-12 11:13:11 -06:00 committed by Jens Axboe
parent 8093f7ca73
commit 21f033f7c7
1 changed files with 10 additions and 2 deletions
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12
drivers/nvme/host/pci.c
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@ -1855,8 +1855,16 @@ static void nvme_reset_work(struct work_struct *work)
if (result)
goto out;
dev->ctrl.event_limit = NVME_NR_AEN_COMMANDS;
queue_work(nvme_workq, &dev->async_work);
/*
* A controller that can not execute IO typically requires user
* intervention to correct. For such degraded controllers, the driver
* should not submit commands the user did not request, so skip
* registering for asynchronous event notification on this condition.
*/
if (dev->online_queues > 1) {
dev->ctrl.event_limit = NVME_NR_AEN_COMMANDS;
queue_work(nvme_workq, &dev->async_work);
}
mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ));