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authorArnd Bergmann <arnd@arndb.de>2008-05-20 13:15:41 -0400
committerJonathan Corbet <corbet@lwn.net>2008-06-20 16:05:55 -0400
commit556889a4ae89d5f2adf98cac58ecf9326b0d0297 (patch)
tree33348f1a09663a4f5717d22ad2517f9e378d3a84 /drivers/char/briq_panel.c
parent8324af6dddac11f9f7e9df8b784f6949ddb61b5d (diff)
briq_panel: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/char/briq_panel.c')
-rw-r--r--drivers/char/briq_panel.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/char/briq_panel.c b/drivers/char/briq_panel.c
index b6f2639f903d..d8cff909001c 100644
--- a/drivers/char/briq_panel.c
+++ b/drivers/char/briq_panel.c
@@ -6,6 +6,7 @@
6 6
7#include <linux/module.h> 7#include <linux/module.h>
8 8
9#include <linux/smp_lock.h>
9#include <linux/types.h> 10#include <linux/types.h>
10#include <linux/errno.h> 11#include <linux/errno.h>
11#include <linux/tty.h> 12#include <linux/tty.h>
@@ -67,11 +68,15 @@ static void set_led(char state)
67 68
68static int briq_panel_open(struct inode *ino, struct file *filep) 69static int briq_panel_open(struct inode *ino, struct file *filep)
69{ 70{
70 /* enforce single access */ 71 lock_kernel();
71 if (vfd_is_open) 72 /* enforce single access, vfd_is_open is protected by BKL */
73 if (vfd_is_open) {
74 unlock_kernel();
72 return -EBUSY; 75 return -EBUSY;
76 }
73 vfd_is_open = 1; 77 vfd_is_open = 1;
74 78
79 unlock_kernel();
75 return 0; 80 return 0;
76} 81}
77 82