Commit 28f85009 authored by Matthias Kaehlcke's avatar Matthias Kaehlcke Committed by James Bottomley
Browse files

[SCSI] st: Use mutex instead of semaphore 



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

Signed-off-by: default avatarMatthias Kaehlcke <matthias.kaehlcke@gmail.com>
Acked-by: default avatarKai Makisara <kai.makisara@kolumbus.fi>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 0c6a89ba

drivers/scsi/st.c

+8 −8
Original line number Diff line number Diff line
@@ -1485,7 +1485,7 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 
	struct st_buffer *STbp;

	char *name = tape_name(STp);



	if (down_interruptible(&STp->lock))

	if (mutex_lock_interruptible(&STp->lock))

		return -ERESTARTSYS;



	retval = rw_checks(STp, filp, count);
@@ -1736,7 +1736,7 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 
	if (SRpnt != NULL)

		st_release_request(SRpnt);

	release_buffering(STp, 0);

	up(&STp->lock);

	mutex_unlock(&STp->lock);



	return retval;

}
@@ -1942,7 +1942,7 @@ st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 
	struct st_buffer *STbp = STp->buffer;

	DEB( char *name = tape_name(STp); )



	if (down_interruptible(&STp->lock))

	if (mutex_lock_interruptible(&STp->lock))

		return -ERESTARTSYS;



	retval = rw_checks(STp, filp, count);
@@ -2069,7 +2069,7 @@ st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 
		release_buffering(STp, 1);

		STbp->buffer_bytes = 0;

	}

	up(&STp->lock);

	mutex_unlock(&STp->lock);



	return retval;

}
@@ -3226,7 +3226,7 @@ static int st_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;



        DEB(
@@ -3537,7 +3537,7 @@ static int st_ioctl(struct inode *inode, struct file *file, 
			retval = (-EFAULT);

		goto out;

	}

	up(&STp->lock);

	mutex_unlock(&STp->lock);

	switch (cmd_in) {

		case SCSI_IOCTL_GET_IDLUN:

		case SCSI_IOCTL_GET_BUS_NUMBER:
@@ -3563,7 +3563,7 @@ static int st_ioctl(struct inode *inode, struct file *file, 
	return retval;



 out:

	up(&STp->lock);

	mutex_unlock(&STp->lock);

	return retval;

}
@@ -4029,7 +4029,7 @@ static int st_probe(struct device *dev) 


	tpnt->density_changed = tpnt->compression_changed =

	    tpnt->blksize_changed = 0;

	init_MUTEX(&tpnt->lock);

	mutex_init(&tpnt->lock);



	st_nr_dev++;

	write_unlock(&st_dev_arr_lock);

drivers/scsi/st.h

+2 −1
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
#define _ST_H



#include <linux/completion.h>

#include <linux/mutex.h>

#include <linux/kref.h>

#include <scsi/scsi_cmnd.h>
@@ -98,7 +99,7 @@ struct st_partstat { 
struct scsi_tape {

	struct scsi_driver *driver;

	struct scsi_device *device;

	struct semaphore lock;	/* For serialization */

	struct mutex lock;	/* For serialization */

	struct completion wait;	/* For SCSI commands */

	struct st_buffer *buffer;

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