X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fchar%2Fdtlk.c;h=6b900b297cc615f7687b8a320fd7ebc4987338a7;hb=fb6813f480806d62361719e84777c8e00d3e86a8;hp=abde6ddefe696e7e0af352e918085c68a83f4d89;hpb=ec4883b015c3212f6f6d04fb2ff45f528492f598;p=linux-2.6

diff --git a/drivers/char/dtlk.c b/drivers/char/dtlk.c
index abde6ddefe..6b900b297c 100644
--- a/drivers/char/dtlk.c
+++ b/drivers/char/dtlk.c
@@ -56,6 +56,7 @@
 #include <linux/errno.h>	/* for -EBUSY */
 #include <linux/ioport.h>	/* for request_region */
 #include <linux/delay.h>	/* for loops_per_jiffy */
+#include <linux/smp_lock.h>	/* cycle_kernel_lock() */
 #include <asm/io.h>		/* for inb_p, outb_p, inb, outb, etc. */
 #include <asm/uaccess.h>	/* for get_user, etc. */
 #include <linux/wait.h>		/* for wait_queue */
@@ -288,10 +289,12 @@ static int dtlk_ioctl(struct inode *inode,
 	}
 }
 
+/* Note that nobody ever sets dtlk_busy... */
 static int dtlk_open(struct inode *inode, struct file *file)
 {
 	TRACE_TEXT("(dtlk_open");
 
+	cycle_kernel_lock();
 	nonseekable_open(inode, file);
 	switch (iminor(inode)) {
 	case DTLK_MINOR: