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| author | Alan Stern <stern@rowland.harvard.edu> | 2020-07-06 18:14:36 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-07-25 05:09:55 +0300 |
| commit | 8f38f8e0a30e1c33cdfc48eba2bd63ac2eae373a (patch) | |
| tree | dc5d4b4b9f4e0fec9caf350588785ad8a76b6a1e /drivers/scsi/scsi_pm.c | |
| parent | df4ec2fa7a4dc20bed62a407f77b5c57f1afbbc8 (diff) | |
| download | linux-8f38f8e0a30e1c33cdfc48eba2bd63ac2eae373a.tar.xz | |
scsi: block: pm: Simplify resume handling
Commit 05d18ae1cc8a ("scsi: pm: Balance pm_only counter of request queue
during system resume") fixed a problem in the block layer's runtime-PM
code: blk_set_runtime_active() failed to call blk_clear_pm_only().
However, the commit's implementation was awkward; it forced the SCSI
system-resume handler to choose whether to call blk_post_runtime_resume()
or blk_set_runtime_active(), depending on whether or not the SCSI device
had previously been runtime suspended.
This patch simplifies the situation considerably by adding the missing
function call directly into blk_set_runtime_active() (under the condition
that the queue is not already in the RPM_ACTIVE state). This allows the
SCSI routine to revert back to its original form. Furthermore, making this
change reveals that blk_post_runtime_resume() (in its success pathway) does
exactly the same thing as blk_set_runtime_active(). The duplicate code is
easily removed by making one routine call the other.
No functional changes are intended.
Link: https://lore.kernel.org/r/20200706151436.GA702867@rowland.harvard.edu
CC: Can Guo <cang@codeaurora.org>
CC: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_pm.c')
| -rw-r--r-- | drivers/scsi/scsi_pm.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c index 5f0ad8b32e3a..3717eea37ecb 100644 --- a/drivers/scsi/scsi_pm.c +++ b/drivers/scsi/scsi_pm.c @@ -80,10 +80,6 @@ static int scsi_dev_type_resume(struct device *dev, dev_dbg(dev, "scsi resume: %d\n", err); if (err == 0) { - bool was_runtime_suspended; - - was_runtime_suspended = pm_runtime_suspended(dev); - pm_runtime_disable(dev); err = pm_runtime_set_active(dev); pm_runtime_enable(dev); @@ -97,10 +93,8 @@ static int scsi_dev_type_resume(struct device *dev, */ if (!err && scsi_is_sdev_device(dev)) { struct scsi_device *sdev = to_scsi_device(dev); - if (was_runtime_suspended) - blk_post_runtime_resume(sdev->request_queue, 0); - else - blk_set_runtime_active(sdev->request_queue); + + blk_set_runtime_active(sdev->request_queue); } } |