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authorArnd Bergmann <arnd@arndb.de>2014-10-13 15:53:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-14 02:18:19 +0200
commite698a51239f26c370247d759da9ea016f5841fc3 (patch)
tree1108b805bcd3789cacb50cb2486f9d64e3b4a320 /drivers
parenta4d4121ba753737c89e42a8df22e4859069fcf25 (diff)
drivers/rtc/rtc-pcf8563.c: fix uninitialized use warning
gcc-4.9 found a potential condition under which the 'pending' variable may be used uninitialized: drivers/rtc/rtc-pcf8563.c: In function 'pcf8563_irq': drivers/rtc/rtc-pcf8563.c:173:5: warning: 'pending' may be used uninitialized in this function [-Wmaybe-uninitialized] This is because in the pcf8563_get_alarm_mode() function, we check any nonzero return of pcf8563_read_block_data, but in the irq function we only check for negative values, so a possible positive value does not get detected if the compiler chooses not to inline the entire call chain. Checking for any non-zero value in the interrupt handler as well is just as correct and lets the compiler know what we are doing, without needing a bogus initialization. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/rtc/rtc-pcf8563.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 5a197d9dc7e7..3a6f994c4da8 100644
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -167,7 +167,7 @@ static irqreturn_t pcf8563_irq(int irq, void *dev_id)
char pending;
err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
- if (err < 0)
+ if (err)
return err;
if (pending) {