diff options
Diffstat (limited to 'drivers/input/serio/libps2.c')
| -rw-r--r-- | drivers/input/serio/libps2.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c index 79c97f94bcb..ed202f2f251 100644 --- a/drivers/input/serio/libps2.c +++ b/drivers/input/serio/libps2.c @@ -177,7 +177,12 @@ int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command) return -1; } - mutex_lock(&ps2dev->cmd_mutex); + if (send && !param) { + WARN_ON(1); + return -1; + } + + mutex_lock_nested(&ps2dev->cmd_mutex, SINGLE_DEPTH_NESTING); serio_pause_rx(ps2dev->serio); ps2dev->flags = command == PS2_CMD_GETID ? PS2_FLAG_WAITID : 0; |