Older compilers like gcc-4.6 may run into a case that returns an uninitialized variable from rcar_drif_enable_rx() if that function was ever called with an empty cur_ch_mask: drivers/media/platform/rcar_drif.c:658:2: error: ‘ret’ may be used uninitialized in this function [-Werror=uninitialized] Newer compilers don't have that problem as they optimize the 'ret' variable away and just return zero in that case. This changes the function to return -EINVAL for this particular failure, to make it consistent across all compiler versions. In case gcc gets changed to report a warning for it in the future, it's also a good idea to shut it up now. Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82203 Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> --- drivers/media/platform/rcar_drif.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c index 522364ff0d5d..2c6afd38b78a 100644 --- a/drivers/media/platform/rcar_drif.c +++ b/drivers/media/platform/rcar_drif.c @@ -630,7 +630,7 @@ static int rcar_drif_enable_rx(struct rcar_drif_sdr *sdr) { unsigned int i; u32 ctr; - int ret; + int ret = -EINVAL; /* * When both internal channels are enabled, they can be synchronized -- 2.9.0
