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block: really disable runtime-pm for blk-mq

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Runtime PM isn't ready for blk-mq yet, and commit 765e40b675 ("block:
disable runtime-pm for blk-mq") tried to disable it. Unfortunately,
it can't take effect in that way since user space still can switch
it on via 'echo auto > /sys/block/sdN/device/power/control'.

This patch disables runtime-pm for blk-mq really by pm_runtime_disable()
and fixes all kinds of PM related kernel crash.

Cc: Tomas Janousek <[email protected]>
Cc: Przemek Socha <[email protected]>
Cc: Alan Stern <[email protected]>
Cc: <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Tested-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei 2018-07-30 20:02:19 +08:00 • committed by Jens Axboe
commit b233f12704
1 changed files with 4 additions and 2 deletions
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6
block/blk-core.c
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@ -3770,9 +3770,11 @@ EXPORT_SYMBOL(blk_finish_plug);
*/
void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
{
/* not support for RQF_PM and ->rpm_status in blk-mq yet */
if (q->mq_ops)
/* Don't enable runtime PM for blk-mq until it is ready */
if (q->mq_ops) {
pm_runtime_disable(dev);
return;
}
q->dev = dev;
q->rpm_status = RPM_ACTIVE;