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linux-sg2042
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[SCSI] st: implement PM 

This implements basic power management for SCSI tapes.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Acked-by: Kai Mäkisara <kai.makisara@kolumbus.fi>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Oliver Neukum 2012-01-15 00:16:51 +01:00 committed by James Bottomley
parent fea6d607e1
commit 46a243f72d
1 changed files with 11 additions and 0 deletions
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11
drivers/scsi/st.c
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@ -1177,6 +1177,7 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
static int st_open(struct inode *inode, struct file *filp)
{
int i, retval = (-EIO);
int resumed = 0;
struct scsi_tape *STp;
struct st_partstat *STps;
int dev = TAPE_NR(inode);
@ -1211,6 +1212,11 @@ static int st_open(struct inode *inode, struct file *filp)
write_unlock(&st_dev_arr_lock);
STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
if (scsi_autopm_get_device(STp->device) < 0) {
retval = -EIO;
goto err_out;
}
resumed = 1;
if (!scsi_block_when_processing_errors(STp->device)) {
retval = (-ENXIO);
goto err_out;
@ -1258,6 +1264,8 @@ static int st_open(struct inode *inode, struct file *filp)
normalize_buffer(STp->buffer);
STp->in_use = 0;
scsi_tape_put(STp);
if (resumed)
scsi_autopm_put_device(STp->device);
mutex_unlock(&st_mutex);
return retval;
@ -1391,6 +1399,7 @@ static int st_release(struct inode *inode, struct file *filp)
write_lock(&st_dev_arr_lock);
STp->in_use = 0;
write_unlock(&st_dev_arr_lock);
scsi_autopm_put_device(STp->device);
scsi_tape_put(STp);
return result;
@ -4154,6 +4163,7 @@ static int st_probe(struct device *dev)
if (error)
goto out_free_tape;
}
scsi_autopm_put_device(SDp);
sdev_printk(KERN_NOTICE, SDp,
"Attached scsi tape %s\n", tape_name(tpnt));
@ -4201,6 +4211,7 @@ static int st_remove(struct device *dev)
struct scsi_tape *tpnt;
int i, j, mode;
scsi_autopm_get_device(SDp);
write_lock(&st_dev_arr_lock);
for (i = 0; i < st_dev_max; i++) {
tpnt = scsi_tapes[i];