tree 73206e6aa46e6e1d32ecb51f050a3507505ca555
parent 495275925192edb0c5bd6cb1e3b6f85162ffd06b
author Wu, Josh <Josh.wu@atmel.com> 1399452645 +0800
committer Andreas Bießmann <andreas.devel@googlemail.com> 1401142245 +0200

gpio: at91: add sanity check for the NULL pointer

We need check the NULL pointer as at91_pio_get_port() may return NULL.

Also print a error message when at91_pio_get_port() failed otherwise we
cannot notice the failure.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>