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[SCSI] osst: Use mutex instead of semaphore 

The OnStream SCSI Tape driver uses a semaphore as mutex.  Use the mutex API
instead of the (binary) semaphore.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Reviewed-by: Satyam Sharma <satyam@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Willem Riede <wrlk@riede.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Matthias Kaehlcke 2007-08-10 14:50:44 -07:00 committed by James Bottomley
parent 488a5c8a9a
commit 4390e60163
2 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/scsi/osst.c
View File

@ -3298,7 +3298,7 @@ static ssize_t osst_write(struct file * filp, const char __user * buf, size_t co
char * name = tape_name(STp);
if (down_interruptible(&STp->lock))
if (mutex_lock_interruptible(&STp->lock))
return (-ERESTARTSYS);
/*
@ -3600,7 +3600,7 @@ if (SRpnt) printk(KERN_ERR "%s:A: Not supposed to have SRpnt at line %d\n", name
out:
if (SRpnt != NULL) osst_release_request(SRpnt);
up(&STp->lock);
mutex_unlock(&STp->lock);
return retval;
}
@ -3619,7 +3619,7 @@ static ssize_t osst_read(struct file * filp, char __user * buf, size_t count, lo
char * name = tape_name(STp);
if (down_interruptible(&STp->lock))
if (mutex_lock_interruptible(&STp->lock))
return (-ERESTARTSYS);
/*
@ -3785,7 +3785,7 @@ static ssize_t osst_read(struct file * filp, char __user * buf, size_t count, lo
out:
if (SRpnt != NULL) osst_release_request(SRpnt);
up(&STp->lock);
mutex_unlock(&STp->lock);
return retval;
}
@ -4852,7 +4852,7 @@ static int osst_ioctl(struct inode * inode,struct file * file,
char * name = tape_name(STp);
void __user * p = (void __user *)arg;
if (down_interruptible(&STp->lock))
if (mutex_lock_interruptible(&STp->lock))
return -ERESTARTSYS;
#if DEBUG
@ -5163,14 +5163,14 @@ static int osst_ioctl(struct inode * inode,struct file * file,
}
if (SRpnt) osst_release_request(SRpnt);
up(&STp->lock);
mutex_unlock(&STp->lock);
return scsi_ioctl(STp->device, cmd_in, p);
out:
if (SRpnt) osst_release_request(SRpnt);
up(&STp->lock);
mutex_unlock(&STp->lock);
return retval;
}
@ -5865,7 +5865,7 @@ static int osst_probe(struct device *dev)
tpnt->modes[2].defined = 1;
tpnt->density_changed = tpnt->compression_changed = tpnt->blksize_changed = 0;
init_MUTEX(&tpnt->lock);
mutex_init(&tpnt->lock);
osst_nr_dev++;
write_unlock(&os_scsi_tapes_lock);

3
drivers/scsi/osst.h
View File

@ -4,6 +4,7 @@
#include <asm/byteorder.h>
#include <linux/completion.h>
#include <linux/mutex.h>
/* FIXME - rename and use the following two types or delete them!
* and the types really should go to st.h anyway...
@ -532,7 +533,7 @@ struct osst_tape {
struct scsi_driver *driver;
unsigned capacity;
struct scsi_device *device;
struct semaphore lock; /* for serialization */
struct mutex lock; /* for serialization */
struct completion wait; /* for SCSI commands */
struct osst_buffer * buffer;