When building with -Wsometimes-uninitialized, Clang warns: drivers/scsi/gdth.c:3662:6: warning: variable 'paddr' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] Don't attempt to call dma_free_coherent when buf is NULL (meaning that we never called dma_alloc_coherent and initialized paddr), which avoids this warning. Link: https://github.com/ClangBuiltLinux/linux/issues/402 Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx> --- drivers/scsi/gdth.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c index e7f1dd4f3b66..0ca9b4393770 100644 --- a/drivers/scsi/gdth.c +++ b/drivers/scsi/gdth.c @@ -3697,8 +3697,9 @@ static int ioc_general(void __user *arg, char *cmnd) rval = 0; out_free_buf: - dma_free_coherent(&ha->pdev->dev, gen.data_len + gen.sense_len, buf, - paddr); + if (buf) + dma_free_coherent(&ha->pdev->dev, gen.data_len + gen.sense_len, + buf, paddr); return rval; } -- 2.21.0
