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[S390] dasd_eer: use mutex instead of semaphore

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Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christoph Hellwig 2007-05-31 17:38:02 +02:00 committed by Martin Schwidefsky
parent c41d4e3e68
commit 3006d7c671
1 changed files with 8 additions and 8 deletions
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16
drivers/s390/block/dasd_eer.c
View file

@ -14,9 +14,9 @@
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/atomic.h>
#include <asm/ebcdic.h>
@ -514,7 +514,7 @@ void dasd_eer_disable(struct dasd_device *device)
* to transfer in a readbuffer, which is protected by the readbuffer_mutex.
*/
static char readbuffer[PAGE_SIZE];
static DECLARE_MUTEX(readbuffer_mutex);
static DEFINE_MUTEX(readbuffer_mutex);
static int dasd_eer_open(struct inode *inp, struct file *filp)
{
@ -579,7 +579,7 @@ static ssize_t dasd_eer_read(struct file *filp, char __user *buf,
struct eerbuffer *eerb;
eerb = (struct eerbuffer *) filp->private_data;
if (down_interruptible(&readbuffer_mutex))
if (mutex_lock_interruptible(&readbuffer_mutex))
return -ERESTARTSYS;
spin_lock_irqsave(&bufferlock, flags);
@ -588,7 +588,7 @@ static ssize_t dasd_eer_read(struct file *filp, char __user *buf,
/* has been deleted */
eerb->residual = 0;
spin_unlock_irqrestore(&bufferlock, flags);
up(&readbuffer_mutex);
mutex_unlock(&readbuffer_mutex);
return -EIO;
} else if (eerb->residual > 0) {
/* OK we still have a second half of a record to deliver */
@ -602,7 +602,7 @@ static ssize_t dasd_eer_read(struct file *filp, char __user *buf,
if (!tc) {
/* no data available */
spin_unlock_irqrestore(&bufferlock, flags);
up(&readbuffer_mutex);
mutex_unlock(&readbuffer_mutex);
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
rc = wait_event_interruptible(
@ -610,7 +610,7 @@ static ssize_t dasd_eer_read(struct file *filp, char __user *buf,
eerb->head != eerb->tail);
if (rc)
return rc;
if (down_interruptible(&readbuffer_mutex))
if (mutex_lock_interruptible(&readbuffer_mutex))
return -ERESTARTSYS;
spin_lock_irqsave(&bufferlock, flags);
}
@ -626,11 +626,11 @@ static ssize_t dasd_eer_read(struct file *filp, char __user *buf,
spin_unlock_irqrestore(&bufferlock, flags);
if (copy_to_user(buf, readbuffer, effective_count)) {
up(&readbuffer_mutex);
mutex_unlock(&readbuffer_mutex);
return -EFAULT;
}
up(&readbuffer_mutex);
mutex_unlock(&readbuffer_mutex);
return effective_count;
}