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| author | Arnd Bergmann <arnd@arndb.de> | 2008-05-20 21:15:41 +0400 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2008-06-21 00:05:55 +0400 |
| commit | 556889a4ae89d5f2adf98cac58ecf9326b0d0297 (patch) | |
| tree | 33348f1a09663a4f5717d22ad2517f9e378d3a84 /drivers/char/briq_panel.c | |
| parent | 8324af6dddac11f9f7e9df8b784f6949ddb61b5d (diff) | |
| download | linux-556889a4ae89d5f2adf98cac58ecf9326b0d0297.tar.xz | |
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.c | 9 |
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 @@ #include <linux/module.h> +#include <linux/smp_lock.h> #include <linux/types.h> #include <linux/errno.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) { - /* enforce single access */ - if (vfd_is_open) + lock_kernel(); + /* enforce single access, vfd_is_open is protected by BKL */ + if (vfd_is_open) { + unlock_kernel(); return -EBUSY; + } vfd_is_open = 1; + unlock_kernel(); return 0; } |