Make sure we report no buffer for 0-length messages. This can only
happen if threshold is set to 0 which is kind of bogus but we should
handle this situation nonetheless.
Reported-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
Fixes: e94bc5d18be0 ("i2c: add helpers to ease DMA handling")
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/i2c-core-base.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index cb6c5cb0df0b..22c8f38bf68c 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -2268,7 +2268,8 @@ EXPORT_SYMBOL(i2c_put_adapter);
*/
u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold)
{
- if (msg->len < threshold)
+ /* also skip 0-length msgs for bogus thresholds of 0 */
+ if (msg->len < threshold || msg->len == 0)
return NULL;
if (msg->flags & I2C_M_DMA_SAFE)
--
2.19.1
