drivers/misc/bh1770glc.c: error handling in bh1770_power_state_store()

There was a signedness bug so "ret" was never less than zero and that
breaks the error handling.  Also in the original code it would overwrite
ret and the result is still negative but it's bogus number instead of the
correct error code.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/misc/bh1770glc.c b/drivers/misc/bh1770glc.c
index cee632e645e1982fee9e99ef84e065daf0d17d39..d79a972f2c799c11b2aa4780efb86417eff13854 100644 (file)
--- a/drivers/misc/bh1770glc.c
+++ b/drivers/misc/bh1770glc.c
@@ -649,7 +649,7 @@ static ssize_t bh1770_power_state_store(struct device *dev,
 {
        struct bh1770_chip *chip =  dev_get_drvdata(dev);
        unsigned long value;
-       size_t ret;
+       ssize_t ret;
 
        if (strict_strtoul(buf, 0, &value))
                return -EINVAL;
@@ -659,8 +659,12 @@ static ssize_t bh1770_power_state_store(struct device *dev,
                pm_runtime_get_sync(dev);
 
                ret = bh1770_lux_rate(chip, chip->lux_rate_index);
-               ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
+               if (ret < 0) {
+                       pm_runtime_put(dev);
+                       goto leave;
+               }
 
+               ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
                if (ret < 0) {
                        pm_runtime_put(dev);
                        goto leave;