@@ -45,6 +45,7 @@
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <asm/uaccess.h>
#include <scsi/scsi.h>
@@ -79,6 +80,11 @@ static DEFINE_MUTEX(sr_mutex);
static int sr_probe(struct device *);
static int sr_remove(struct device *);
static int sr_done(struct scsi_cmnd *);
+static int sr_runtime_suspend(struct device *dev);
+
+static struct dev_pm_ops sr_pm_ops = {
+ .runtime_suspend = sr_runtime_suspend,
+};
static struct scsi_driver sr_template = {
.owner = THIS_MODULE,
@@ -86,6 +92,7 @@ static struct scsi_driver sr_template = {
.name = "sr",
.probe = sr_probe,
.remove = sr_remove,
+ .pm = &sr_pm_ops,
},
.done = sr_done,
};
@@ -131,6 +138,16 @@ static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
return container_of(disk->private_data, struct scsi_cd, driver);
}
+static int sr_runtime_suspend(struct device *dev)
+{
+ struct scsi_cd *cd = dev_get_drvdata(dev);
+
+ if (cd->media_present)
+ return -EBUSY;
+ else
+ return 0;
+}
+
/*
* The get and put routines for the struct scsi_cd. Note this entity
* has a scsi_device pointer and owns a reference to this.
@@ -146,7 +163,8 @@ static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
kref_get(&cd->kref);
if (scsi_device_get(cd->device))
goto out_put;
- goto out;
+ if (!scsi_autopm_get_device(cd->device))
+ goto out;
out_put:
kref_put(&cd->kref, sr_kref_release);
@@ -162,6 +180,7 @@ 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);
}
@@ -540,6 +559,8 @@ 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);
/*
@@ -571,6 +592,7 @@ 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;
}
@@ -578,7 +600,13 @@ static unsigned int sr_block_check_events(struct gendisk *disk,
unsigned int clearing)
{
struct scsi_cd *cd = scsi_cd(disk);
- return cdrom_check_events(&cd->cdi, clearing);
+ unsigned int ret;
+
+ scsi_autopm_get_device(cd->device);
+ ret = cdrom_check_events(&cd->cdi, clearing);
+ scsi_autopm_put_device(cd->device);
+
+ return ret;
}
static int sr_block_revalidate_disk(struct gendisk *disk)
@@ -586,12 +614,16 @@ 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))
- return 0;
+ goto out;
sr_cd_check(&cd->cdi);
get_sectorsize(cd);
+out:
+ scsi_autopm_put_device(cd->device);
return 0;
}
@@ -718,6 +750,8 @@ static int sr_probe(struct device *dev)
sdev_printk(KERN_DEBUG, sdev,
"Attached scsi CD-ROM %s\n", cd->cdi.name);
+ scsi_autopm_put_device(cd->device);
+
return 0;
fail_put:
@@ -965,6 +999,8 @@ static int sr_remove(struct device *dev)
{
struct scsi_cd *cd = dev_get_drvdata(dev);
+ scsi_autopm_get_device(cd->device);
+
blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
del_gendisk(cd->disk);