ASoC: samsung: idma: Check of ioremap return value

[ Upstream commit 3ecb467 ]

Because of the potential failure of the ioremap(), the buf->area could
be NULL.
Therefore, we need to check it and return -ENOMEM in order to transfer
the error.

Fixes: f09aecd ("ASoC: SAMSUNG: Add I2S0 internal dma driver")
Signed-off-by: Jiasheng Jiang <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: JiangJias

sound/soc/samsung/idma.c

@@ -360,6 +360,8 @@ static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
 	buf->addr = idma.lp_tx_addr;
 	buf->bytes = idma_hardware.buffer_bytes_max;
 	buf->area = (unsigned char * __force)ioremap(buf->addr, buf->bytes);
+	if (!buf->area)
+		return -ENOMEM;
 
 	return 0;
 }