ASoC: imx-audmux: Check for NULL pointer

Check for NULL pointer before accessing it.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/imx/imx-audmux.c b/sound/soc/imx/imx-audmux.c
index 912a342..0fe66c3 100644 (file)
--- a/sound/soc/imx/imx-audmux.c
+++ b/sound/soc/imx/imx-audmux.c
@@ -79,6 +79,9 @@ static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
        if (!buf)
                return -ENOMEM;
 
+       if (!audmux_base)
+               return -ENOSYS;
+
        if (audmux_clk)
                clk_prepare_enable(audmux_clk);