diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-05-29 21:53:50 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-05-30 14:33:01 +0100 |
| commit | 2389b272168ceec056ca1d8a870a97fa9c26e11a (patch) | |
| tree | e3a8be37e9e97bb8e232fbe6bd7823799e6899c1 /drivers/serial/amba-pl011.c | |
| parent | 2ccdd1e77da52ad494e9af46bf272d816830cb28 (diff) | |
| download | lwn-2389b272168ceec056ca1d8a870a97fa9c26e11a.tar.gz lwn-2389b272168ceec056ca1d8a870a97fa9c26e11a.zip | |
[ARM] 4417/1: Serial: Fix AMBA drivers locking
The -rt patch triggered a lockdep warning in the amba serial drivers, which never
shows up on UP kernels. On SMP systems this would trigger as well.
Release the port lock before calling tty_flip_buffer_push() and reacquire it after
the call. This matches the code in the 8250 serial driver.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial/amba-pl011.c')
| -rw-r--r-- | drivers/serial/amba-pl011.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c index 44639e71372a..954073c6ce3a 100644 --- a/drivers/serial/amba-pl011.c +++ b/drivers/serial/amba-pl011.c @@ -153,8 +153,9 @@ static void pl011_rx_chars(struct uart_amba_port *uap) ignore_char: status = readw(uap->port.membase + UART01x_FR); } + spin_unlock(&uap->port.lock); tty_flip_buffer_push(tty); - return; + spin_lock(&uap->port.lock); } static void pl011_tx_chars(struct uart_amba_port *uap) |