time: Fix signedness bug in sysfs_get_uname() and its callers

sysfs_get_uname() is erroneously declared as returning size_t even
though it may return a negative value, specifically -EINVAL.  Its
callers then check whether its return value is less than zero and indeed
that is never the case for size_t.

This patch changes sysfs_get_uname() to return ssize_t and makes sure
its callers use ssize_t accordingly.

Signed-off-by: Patrick Palka <patrick@parcs.ath.cx>
[jstultz: Didn't apply cleanly, as a similar partial fix was also applied
so had to resolve the collisions]
Signed-off-by: John Stultz <john.stultz@linaro.org>

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 38959c8..30554b9 100644 (file)
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -584,7 +584,7 @@ static ssize_t sysfs_unbind_tick_dev(struct device *dev,
                                     const char *buf, size_t count)
 {
        char name[CS_NAME_LEN];
-       size_t ret = sysfs_get_uname(buf, name, count);
+       ssize_t ret = sysfs_get_uname(buf, name, count);
        struct clock_event_device *ce;
 
        if (ret < 0)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index c9317e1..ba3e502 100644 (file)
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -909,7 +909,7 @@ sysfs_show_current_clocksources(struct device *dev,
        return count;
 }
 
-size_t sysfs_get_uname(const char *buf, char *dst, size_t cnt)
+ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt)
 {
        size_t ret = cnt;
 

diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index bc906ca..18e71f7 100644 (file)
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -31,7 +31,7 @@ extern void tick_install_replacement(struct clock_event_device *dev);
 
 extern void clockevents_shutdown(struct clock_event_device *dev);
 
-extern size_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
+extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
 
 /*
  * NO_HZ / high resolution timer shared code