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[v2,05/11] s390: pci: don't print uninitialized data for debugging

Message ID 20161110164454.293477-6-arnd@arndb.de
State Superseded
Headers show
Series [v2,01/11] Kbuild: enable -Wmaybe-uninitialized warning for "make W=1" | expand

Commit Message

Arnd Bergmann Nov. 10, 2016, 4:44 p.m. UTC 
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 <arnd@arndb.de>

Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>

Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

---
 arch/s390/pci/pci_dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.9.0
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Patch

diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 7350c8b..6b2f72f 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);