diff options
| author | Hannes Reinecke <hare@suse.com> | 2012-09-10 15:36:44 -0700 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-09-24 13:07:02 +0400 |
| commit | 0644f5393e915f13733bcc65f13195ff39aeb63e (patch) | |
| tree | 83484a2a59264721238bb2c25a88aeb46f3740d1 /drivers/scsi/st.c | |
| parent | fe542396da73b7e2b0848618c7e95855c1b75689 (diff) | |
[SCSI] st: remove st_mutex
The st_mutex was created when the BKL was removed, and
prevents simultaneous st_open calls. It is better to
protect just the necessary data.
Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Lee Duncan <lduncan@suse.com>
Acked-by: Kai Mäkisara <Kai.Makisara@kolumbus.fi>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/st.c')
| -rw-r--r-- | drivers/scsi/st.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index ceca095e5d8d..98156a97c472 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -75,7 +75,6 @@ static const char *verstr = "20101219"; #include "st_options.h" #include "st.h" -static DEFINE_MUTEX(st_mutex); static int buffer_kbs; static int max_sg_segs; static int try_direct_io = TRY_DIRECT_IO; @@ -1185,7 +1184,6 @@ static int st_open(struct inode *inode, struct file *filp) int dev = TAPE_NR(inode); char *name; - mutex_lock(&st_mutex); /* * We really want to do nonseekable_open(inode, filp); here, but some * versions of tar incorrectly call lseek on tapes and bail out if that @@ -1194,7 +1192,6 @@ static int st_open(struct inode *inode, struct file *filp) filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); if (!(STp = scsi_tape_get(dev))) { - mutex_unlock(&st_mutex); return -ENXIO; } @@ -1205,7 +1202,6 @@ static int st_open(struct inode *inode, struct file *filp) if (STp->in_use) { spin_unlock(&st_use_lock); scsi_tape_put(STp); - mutex_unlock(&st_mutex); DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) return (-EBUSY); } @@ -1259,16 +1255,16 @@ static int st_open(struct inode *inode, struct file *filp) retval = (-EIO); goto err_out; } - mutex_unlock(&st_mutex); return 0; err_out: normalize_buffer(STp->buffer); + spin_lock(&st_use_lock); STp->in_use = 0; + spin_unlock(&st_use_lock); scsi_tape_put(STp); if (resumed) scsi_autopm_put_device(STp->device); - mutex_unlock(&st_mutex); return retval; } |