[PATCH 3.16 089/178] IB/qib: fix false-postive maybe-uninitialized warning

From: Ben Hutchings
Date: Sun Jul 16 2017 - 10:03:57 EST


3.16.46-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@xxxxxxxx>

commit f6aafac184a3e46e919769dd4faa8bf0dc436534 upstream.

aarch64-linux-gcc-7 complains about code it doesn't fully understand:

drivers/infiniband/hw/qib/qib_iba7322.c: In function 'qib_7322_txchk_change':
include/asm-generic/bitops/non-atomic.h:105:35: error: 'shadow' may be used uninitialized in this function [-Werror=maybe-uninitialized]

The code is right, and despite trying hard, I could not come up with a version
that I liked better than just adding a fake initialization here to shut up the
warning.

Fixes: f931551bafe1 ("IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/qib/qib_iba7322.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -7078,7 +7078,7 @@ static void qib_7322_txchk_change(struct
unsigned long flags;

while (wait) {
- unsigned long shadow;
+ unsigned long shadow = 0;
int cstart, previ = -1;

/*