diff options
authorArnd Bergmann <>2016-11-10 17:44:48 +0100
committerLinus Torvalds <>2016-11-11 08:45:08 -0800
commit92dfffee974f75c28b0c89f31318669091de1ec3 (patch)
parent069013a9e2bbf1ace3f796cb664023dcd40730f7 (diff)
s390: pci: don't print uninitialized data for debugging
gcc correctly warns about an incorrect use of the 'pa' variable in case we pass an empty scatterlist to __s390_dma_map_sg: arch/s390/pci/pci_dma.c: In function '__s390_dma_map_sg': arch/s390/pci/pci_dma.c:309:13: warning: 'pa' may be used uninitialized in this function [-Wmaybe-uninitialized] This adds a bogus initialization to the function to sanitize the debug output. I would have preferred a solution without the initialization, but I only got the report from the kbuild bot after turning on the warning again, and didn't manage to reproduce it myself. Signed-off-by: Arnd Bergmann <> Acked-by: Sebastian Ott <> Acked-by: Martin Schwidefsky <> Signed-off-by: Linus Torvalds <>
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 7350c8bc13a2..6b2f72f523b9 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -423,7 +423,7 @@ static int __s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
dma_addr_t dma_addr_base, dma_addr;
int flags = ZPCI_PTE_VALID;
struct scatterlist *s;
- unsigned long pa;
+ unsigned long pa = 0;
int ret;
size = PAGE_ALIGN(size);