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| author | Ingo Molnar <mingo@elte.hu> | 2008-07-16 02:29:07 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-16 02:29:07 +0400 |
| commit | 82638844d9a8581bbf33201cc209a14876eca167 (patch) | |
| tree | 961d7f9360194421a71aa644a9d0c176a960ce49 /drivers/char/briq_panel.c | |
| parent | 9982fbface82893e77d211fbabfbd229da6bdde6 (diff) | |
| parent | 63cf13b77ab785e87c867defa8545e6d4a989774 (diff) | |
| download | linux-82638844d9a8581bbf33201cc209a14876eca167.tar.xz | |
Merge branch 'linus' into cpus4096
Conflicts:
arch/x86/xen/smp.c
kernel/sched_rt.c
net/iucv/iucv.c
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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; } |