If bytes get lost in the communication with a serial mouse using the MS protocol, the kernel driver could do a better job getting back in sync. The first byte in a packet has bit 6 set, and no other bytes have that bit set. Therefore, if a byte is received with bit 6 cleared when the driver thinks it is at byte 0 in the packet, the driver thinks wrong and the byte should just be ignored.
This fix prevents spurious left/right button events when the serial communication is disturbed by a CPU-hungry real-time process. Signed-off-by: Peter Osterlund <[EMAIL PROTECTED]> --- drivers/input/mouse/sermouse.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/input/mouse/sermouse.c b/drivers/input/mouse/sermouse.c index a85d747..24bed4b 100644 --- a/drivers/input/mouse/sermouse.c +++ b/drivers/input/mouse/sermouse.c @@ -108,6 +108,7 @@ static void sermouse_process_ms(struct sermouse *sermouse, signed char data) signed char *buf = sermouse->buf; if (data & 0x40) sermouse->count = 0; + else if (sermouse->count == 0) return; switch (sermouse->count) { -- Peter Osterlund - [EMAIL PROTECTED] http://web.telia.com/~u89404340 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/