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authorAaron Lu <aaron.lu@intel.com>2013-10-28 15:27:49 +0800
committerJames Bottomley <JBottomley@Parallels.com>2013-12-16 10:57:51 -0800
commit6627b38fd902cd31c6ad52f9be12a17a38f0faef (patch)
tree73a734d7a13ba1589211939f4d38bbbcf4814aac /drivers/scsi/sr.c
parent3c60cfd73966797746530768d66597d025a69804 (diff)
downloadlinux-6627b38fd902cd31c6ad52f9be12a17a38f0faef.tar.gz
[SCSI] sr: use block layer runtime PM
Migrate sr to make use of block layer runtime PM. Accordingly, the SCSI bus layer runtime PM callback is simplified as all SCSI drivers implementing runtime PM now use the block layer's request-based mechanism. Note that due to the device will be polled by kernel at a constant interval, if the autosuspend delay is set longer than the polling interval then the device will never suspend. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/sr.c')
-rw-r--r--drivers/scsi/sr.c37
1 files changed, 13 insertions, 24 deletions
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 119d67f9c47e..40d85929aefe 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -161,14 +161,10 @@ static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
goto out;
cd = scsi_cd(disk);
kref_get(&cd->kref);
- if (scsi_device_get(cd->device))
- goto out_put;
- if (!scsi_autopm_get_device(cd->device))
- goto out;
-
- out_put:
- kref_put(&cd->kref, sr_kref_release);
- cd = NULL;
+ if (scsi_device_get(cd->device)) {
+ kref_put(&cd->kref, sr_kref_release);
+ cd = NULL;
+ }
out:
mutex_unlock(&sr_ref_mutex);
return cd;
@@ -180,7 +176,6 @@ static void scsi_cd_put(struct scsi_cd *cd)
mutex_lock(&sr_ref_mutex);
kref_put(&cd->kref, sr_kref_release);
- scsi_autopm_put_device(sdev);
scsi_device_put(sdev);
mutex_unlock(&sr_ref_mutex);
}
@@ -558,8 +553,6 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
void __user *argp = (void __user *)arg;
int ret;
- scsi_autopm_get_device(cd->device);
-
mutex_lock(&sr_mutex);
/*
@@ -591,7 +584,6 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
out:
mutex_unlock(&sr_mutex);
- scsi_autopm_put_device(cd->device);
return ret;
}
@@ -599,17 +591,11 @@ static unsigned int sr_block_check_events(struct gendisk *disk,
unsigned int clearing)
{
struct scsi_cd *cd = scsi_cd(disk);
- unsigned int ret;
- if (atomic_read(&cd->device->disk_events_disable_depth) == 0) {
- scsi_autopm_get_device(cd->device);
- ret = cdrom_check_events(&cd->cdi, clearing);
- scsi_autopm_put_device(cd->device);
- } else {
- ret = 0;
- }
+ if (atomic_read(&cd->device->disk_events_disable_depth))
+ return 0;
- return ret;
+ return cdrom_check_events(&cd->cdi, clearing);
}
static int sr_block_revalidate_disk(struct gendisk *disk)
@@ -617,8 +603,6 @@ static int sr_block_revalidate_disk(struct gendisk *disk)
struct scsi_cd *cd = scsi_cd(disk);
struct scsi_sense_hdr sshdr;
- scsi_autopm_get_device(cd->device);
-
/* if the unit is not ready, nothing more to do */
if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
goto out;
@@ -626,7 +610,6 @@ static int sr_block_revalidate_disk(struct gendisk *disk)
sr_cd_check(&cd->cdi);
get_sectorsize(cd);
out:
- scsi_autopm_put_device(cd->device);
return 0;
}
@@ -747,6 +730,12 @@ static int sr_probe(struct device *dev)
if (register_cdrom(&cd->cdi))
goto fail_put;
+ /*
+ * Initialize block layer runtime PM stuffs before the
+ * periodic event checking request gets started in add_disk.
+ */
+ blk_pm_runtime_init(sdev->request_queue, dev);
+
dev_set_drvdata(dev, cd);
disk->flags |= GENHD_FL_REMOVABLE;
add_disk(disk);