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nvme: Prevent controller state invalid transition

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Acquiring the nvme_ctrl lock before reading ctrl->state in
nvme_change_ctrl_state() should prevent a theoretical invalid state
transition, in the event of two threads racing inside that function.

I haven't been able to observe this happening with the current code, and
the current state machine seems to be simple enough to not be
affected by these invalid transitions, but future modifications could
make it more likely to happen.

Signed-off-by: Gabriel Krisman Bertazi <krisman@linux.vnet.ibm.com>
Reviewed-by: Sagi Grimberg <sag@grimberg.me>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Gabriel Krisman Bertazi 2016-07-29 16:15:18 -03:00 committed by Jens Axboe
parent 694d0d0bb2
commit f6b6a28e2d
1 changed files with 5 additions and 2 deletions
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7
drivers/nvme/host/core.c
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@ -81,10 +81,12 @@ EXPORT_SYMBOL_GPL(nvme_cancel_request);
bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
enum nvme_ctrl_state new_state)
{
enum nvme_ctrl_state old_state = ctrl->state;
enum nvme_ctrl_state old_state;
bool changed = false;
spin_lock_irq(&ctrl->lock);
old_state = ctrl->state;
switch (new_state) {
case NVME_CTRL_LIVE:
switch (old_state) {
@ -140,11 +142,12 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
default:
break;
}
spin_unlock_irq(&ctrl->lock);
if (changed)
ctrl->state = new_state;
spin_unlock_irq(&ctrl->lock);
return changed;
}
EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);