On Fri, Feb 15, 2019 at 05:02:02PM +0800, Hsin-Yi Wang wrote: > i2c_get_dma_safe_msg_buf() allocates space based on msg->len. If threshold is > 0 and msg->len is also 0, function makes zero-length allocation, which returns > a special ZERO_SIZE_PTR instead of a NULL pointer, and this will cause later > code to fail. Modify the threshold to > 0 so the function returns NULL pointer. > > Fixes: fc66b39fe36a ("i2c: mediatek: Use DMA safe buffers for i2c transactions") > Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> Right. But we need to fix i2c_get_dma_safe_msg_buf(), so it will be handled for all callers. Do you want to add a check if msg->len is 0 or shall I? Both fine for me.
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