From: Lukas Wunner lukas@wunner.de
commit 89efbe70b27dd325d8a8c177743a26b885f7faec upstream.
pl011_probe() calls pl011_setup_port() to reserve an amba_ports[] entry, then calls pl011_register_port() to register the uart driver with the tty layer.
If registration of the uart driver fails, the amba_ports[] entry is not released. If this happens 14 times (value of UART_NR macro), then all amba_ports[] entries will have been leaked and driver probing is no longer possible. (To be fair, that can only happen if the DeviceTree doesn't contain alias IDs since they cause the same entry to be used for a given port.) Fix it.
Fixes: ef2889f7ffee ("serial: pl011: Move uart_register_driver call to device") Signed-off-by: Lukas Wunner lukas@wunner.de Cc: stable@vger.kernel.org # v3.15+ Cc: Tushar Behera tushar.behera@linaro.org Link: https://lore.kernel.org/r/138f8c15afb2f184d8102583f8301575566064a6.159731616... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/tty/serial/amba-pl011.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -2593,7 +2593,7 @@ static int pl011_setup_port(struct devic
static int pl011_register_port(struct uart_amba_port *uap) { - int ret; + int ret, i;
/* Ensure interrupts from this UART are masked and cleared */ pl011_write(0, uap, REG_IMSC); @@ -2604,6 +2604,9 @@ static int pl011_register_port(struct ua if (ret < 0) { dev_err(uap->port.dev, "Failed to register AMBA-PL011 driver\n"); + for (i = 0; i < ARRAY_SIZE(amba_ports); i++) + if (amba_ports[i] == uap) + amba_ports[i] = NULL; return ret; } }