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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-11-29 23:40:58 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-11-29 23:41:15 -0800 |
| commit | 21cea58e49cf59e7c77ce2a01be432458e9f99a9 (patch) | |
| tree | 69c02730498e25664f0ef32e2b97aa26ba93962c /drivers/char/keyboard.c | |
| parent | dbe1420b4ba398feef035f7cd8181ec2e492228b (diff) | |
| download | linux-stable-21cea58e49cf59e7c77ce2a01be432458e9f99a9.tar.gz linux-stable-21cea58e49cf59e7c77ce2a01be432458e9f99a9.tar.bz2 linux-stable-21cea58e49cf59e7c77ce2a01be432458e9f99a9.zip | |
Input: keyboard - add locking around event handling
Keyboard input handler is multiplexing events form all keyboard-like
devices in the system. Because of that per-device lock provided by
input core is not enough to prevent clashes in ked_event() and we
need our own lock to ensure that only one thread at a time executing
kbd_event().
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/char/keyboard.c')
| -rw-r--r-- | drivers/char/keyboard.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c index 747683f055ed..ca090e57e161 100644 --- a/drivers/char/keyboard.c +++ b/drivers/char/keyboard.c @@ -132,6 +132,7 @@ int shift_state = 0; */ static struct input_handler kbd_handler; +static DEFINE_SPINLOCK(kbd_event_lock); static unsigned long key_down[BITS_TO_LONGS(KEY_CNT)]; /* keyboard key bitmap */ static unsigned char shift_down[NR_SHIFT]; /* shift state counters.. */ static int dead_key_next; @@ -1296,10 +1297,16 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw) static void kbd_event(struct input_handle *handle, unsigned int event_type, unsigned int event_code, int value) { + /* We are called with interrupts disabled, just take the lock */ + spin_lock(&kbd_event_lock); + if (event_type == EV_MSC && event_code == MSC_RAW && HW_RAW(handle->dev)) kbd_rawcode(value); if (event_type == EV_KEY) kbd_keycode(event_code, value, HW_RAW(handle->dev)); + + spin_unlock(&kbd_event_lock); + tasklet_schedule(&keyboard_tasklet); do_poke_blanked_console = 1; schedule_console_callback(); |