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path: root/drivers/char/snsc.c
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Diffstat (limited to 'drivers/char/snsc.c')
-rw-r--r--drivers/char/snsc.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/char/snsc.c b/drivers/char/snsc.c
index 32b74de18f5..5816b39ff5a 100644
--- a/drivers/char/snsc.c
+++ b/drivers/char/snsc.c
@@ -21,7 +21,7 @@
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <asm/sn/io.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/module.h>
@@ -34,6 +34,7 @@
#define SCDRV_BUFSZ 2048
#define SCDRV_TIMEOUT 1000
+static DEFINE_MUTEX(scdrv_mutex);
static irqreturn_t
scdrv_interrupt(int irq, void *subch_data)
{
@@ -105,7 +106,7 @@ scdrv_open(struct inode *inode, struct file *file)
file->private_data = sd;
/* hook this subchannel up to the system controller interrupt */
- lock_kernel();
+ mutex_lock(&scdrv_mutex);
rv = request_irq(SGI_UART_VECTOR, scdrv_interrupt,
IRQF_SHARED | IRQF_DISABLED,
SYSCTL_BASENAME, sd);
@@ -113,10 +114,10 @@ scdrv_open(struct inode *inode, struct file *file)
ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch);
kfree(sd);
printk("%s: irq request failed (%d)\n", __func__, rv);
- unlock_kernel();
+ mutex_unlock(&scdrv_mutex);
return -EBUSY;
}
- unlock_kernel();
+ mutex_unlock(&scdrv_mutex);
return 0;
}
@@ -357,6 +358,7 @@ static const struct file_operations scdrv_fops = {
.poll = scdrv_poll,
.open = scdrv_open,
.release = scdrv_release,
+ .llseek = noop_llseek,
};
static struct class *snsc_class;