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briq_panel: BKL pushdown

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2008-05-20 19:15:41 +02:00 committed by Jonathan Corbet
parent 8324af6ddd
commit 556889a4ae
1 changed files with 7 additions and 2 deletions
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9
drivers/char/briq_panel.c
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@ -6,6 +6,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/smp_lock.h>
#include <linux/types.h> #include <linux/types.h>
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/tty.h> #include <linux/tty.h>
@ -67,11 +68,15 @@ static void set_led(char state)
static int briq_panel_open(struct inode *ino, struct file *filep) static int briq_panel_open(struct inode *ino, struct file *filep)
{ {
/* enforce single access */ lock_kernel();
if (vfd_is_open) /* enforce single access, vfd_is_open is protected by BKL */
if (vfd_is_open) {
unlock_kernel();
return -EBUSY; return -EBUSY;
}
vfd_is_open = 1; vfd_is_open = 1;
unlock_kernel();
return 0; return 0;
} }