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scsi: ch: remove ch_mutex() 

ch_mutex() was introduced with a mechanical conversion, but as we now have
correct locking we can remove it altogether.

Link: https://lore.kernel.org/r/20200213153207.123357-4-hare@suse.de
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
alistair/sensors
Hannes Reinecke 2020-02-13 16:32:07 +01:00 committed by Martin K. Petersen
parent 1c7ce4bcfb
commit 30f6d494cc
1 changed files with 0 additions and 5 deletions
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5
drivers/scsi/ch.c
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@ -44,7 +44,6 @@ MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
static DEFINE_MUTEX(ch_mutex);
static int init = 1;
module_param(init, int, 0444);
MODULE_PARM_DESC(init, \
@ -591,26 +590,22 @@ ch_open(struct inode *inode, struct file *file)
scsi_changer *ch;
int minor = iminor(inode);
mutex_lock(&ch_mutex);
spin_lock(&ch_index_lock);
ch = idr_find(&ch_index_idr, minor);
if (ch == NULL || !kref_get_unless_zero(&ch->ref)) {
spin_unlock(&ch_index_lock);
mutex_unlock(&ch_mutex);
return -ENXIO;
}
spin_unlock(&ch_index_lock);
if (scsi_device_get(ch->device)) {
kref_put(&ch->ref, ch_destroy);
mutex_unlock(&ch_mutex);
return -ENXIO;
}
/* Synchronize with ch_probe() */
mutex_lock(&ch->lock);
file->private_data = ch;
mutex_unlock(&ch->lock);
mutex_unlock(&ch_mutex);
return 0;
}