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-rw-r--r--drivers/scsi/ch.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index c4b938bc30d3..aa2011b64683 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -22,6 +22,7 @@
#include <linux/chio.h> /* here are all the ioctls */
#include <linux/mutex.h>
#include <linux/idr.h>
+#include <linux/smp_lock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@@ -571,16 +572,19 @@ ch_open(struct inode *inode, struct file *file)
scsi_changer *ch;
int minor = iminor(inode);
+ lock_kernel();
spin_lock(&ch_index_lock);
ch = idr_find(&ch_index_idr, minor);
if (NULL == ch || scsi_device_get(ch->device)) {
spin_unlock(&ch_index_lock);
+ unlock_kernel();
return -ENXIO;
}
spin_unlock(&ch_index_lock);
file->private_data = ch;
+ unlock_kernel();
return 0;
}