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path: root/drivers/block/paride/pt.c
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Diffstat (limited to 'drivers/block/paride/pt.c')
-rw-r--r--drivers/block/paride/pt.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/block/paride/pt.c b/drivers/block/paride/pt.c
index 8b9549ab4a4e..314333db16ee 100644
--- a/drivers/block/paride/pt.c
+++ b/drivers/block/paride/pt.c
@@ -146,6 +146,7 @@ static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
#include <linux/mtio.h>
#include <linux/device.h>
#include <linux/sched.h> /* current, TASK_*, schedule_timeout() */
+#include <linux/smp_lock.h>
#include <asm/uaccess.h>
@@ -650,8 +651,11 @@ static int pt_open(struct inode *inode, struct file *file)
struct pt_unit *tape = pt + unit;
int err;
- if (unit >= PT_UNITS || (!tape->present))
+ lock_kernel();
+ if (unit >= PT_UNITS || (!tape->present)) {
+ unlock_kernel();
return -ENODEV;
+ }
err = -EBUSY;
if (!atomic_dec_and_test(&tape->available))
@@ -678,10 +682,12 @@ static int pt_open(struct inode *inode, struct file *file)
}
file->private_data = tape;
+ unlock_kernel();
return 0;
out:
atomic_inc(&tape->available);
+ unlock_kernel();
return err;
}