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serial: pl011: protect attribute read from NULL platform data struct

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It's completely feasible that platform data will be empty i.e. when
booting with Device Tree with no device AUXDATA. So we must protect
it's use in these use-cases, or risk a kernel Oops.

Cc: Russell King <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Lee Jones 2013-05-09 13:50:55 +01:00 • committed by Greg Kroah-Hartman
commit f6b6f52b58
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/amba-pl011.c
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@ -332,7 +332,7 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port *
dmaengine_slave_config(chan, &rx_conf);
uap->dmarx.chan = chan;
if (plat->dma_rx_poll_enable) {
if (plat && plat->dma_rx_poll_enable) {
/* Set poll rate if specified. */
if (plat->dma_rx_poll_rate) {
uap->dmarx.auto_poll_rate = false;