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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2009-11-30 07:40:58 (GMT)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-11-30 07:41:15 (GMT)
commit21cea58e49cf59e7c77ce2a01be432458e9f99a9 (patch)
tree69c02730498e25664f0ef32e2b97aa26ba93962c /drivers/char/keyboard.c
parentdbe1420b4ba398feef035f7cd8181ec2e492228b (diff)
downloadlinux-21cea58e49cf59e7c77ce2a01be432458e9f99a9.tar.xz
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.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 747683f..ca090e5 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();