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| author | Stanley Chu <stanley.chu@mediatek.com> | 2019-09-12 16:35:27 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-09-12 07:11:56 -0600 |
| commit | 8a15b4d7cd872b784f585d38d9240f6ee588381b (patch) | |
| tree | e4a4960021786eeeae82b0785a39d8551513a116 /block/blk-pm.c | |
| parent | f7c4ce890dd23f2d41ad9630263aad6e9720af58 (diff) | |
| download | linux-8a15b4d7cd872b784f585d38d9240f6ee588381b.tar.gz linux-8a15b4d7cd872b784f585d38d9240f6ee588381b.tar.bz2 linux-8a15b4d7cd872b784f585d38d9240f6ee588381b.zip | |
block: bypass blk_set_runtime_active for uninitialized q->dev
Some devices may skip blk_pm_runtime_init() and have null pointer
in its request_queue->dev. For example, SCSI devices of UFS Well-Known
LUNs.
Currently the null pointer is checked by the user of
blk_set_runtime_active(), i.e., scsi_dev_type_resume(). It is better to
check it by blk_set_runtime_active() itself instead of by its users.
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-pm.c')
| -rw-r--r-- | block/blk-pm.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/block/blk-pm.c b/block/blk-pm.c index 0a028c189897..1adc1cd748b4 100644 --- a/block/blk-pm.c +++ b/block/blk-pm.c @@ -207,10 +207,12 @@ EXPORT_SYMBOL(blk_post_runtime_resume); */ void blk_set_runtime_active(struct request_queue *q) { - spin_lock_irq(&q->queue_lock); - q->rpm_status = RPM_ACTIVE; - pm_runtime_mark_last_busy(q->dev); - pm_request_autosuspend(q->dev); - spin_unlock_irq(&q->queue_lock); + if (q->dev) { + spin_lock_irq(&q->queue_lock); + q->rpm_status = RPM_ACTIVE; + pm_runtime_mark_last_busy(q->dev); + pm_request_autosuspend(q->dev); + spin_unlock_irq(&q->queue_lock); + } } EXPORT_SYMBOL(blk_set_runtime_active); |