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The old function silently accepts garbage input. kstrtoint() returns -EINVAL so the driver can actually tell the user they typed something stupid instead of accepting 0 and wondering why the thermometer isn't responding. The 0-255 clamping stays the same, just with proper error handling in front of it now. Signed-off-by: Jad Keskes --- drivers/usb/misc/cytherm.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/usb/misc/cytherm.c b/drivers/usb/misc/cytherm.c index b183df9826bc..81de3fecf3da 100644 --- a/drivers/usb/misc/cytherm.c +++ b/drivers/usb/misc/cytherm.c @@ -85,7 +85,9 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *att if (!buffer) return 0; - cytherm->brightness = simple_strtoul(buf, NULL, 10); + retval = kstrtoint(buf, 10, &cytherm->brightness); + if (retval < 0) + return retval; if (cytherm->brightness > 0xFF) cytherm->brightness = 0xFF; @@ -217,7 +219,9 @@ static ssize_t port0_store(struct device *dev, struct device_attribute *attr, co if (!buffer) return 0; - tmp = simple_strtoul(buf, NULL, 10); + retval = kstrtoint(buf, 10, &tmp); + if (retval < 0) + return retval; if (tmp > 0xFF) tmp = 0xFF; @@ -272,7 +276,9 @@ static ssize_t port1_store(struct device *dev, struct device_attribute *attr, co if (!buffer) return 0; - tmp = simple_strtoul(buf, NULL, 10); + retval = kstrtoint(buf, 10, &tmp); + if (retval < 0) + return retval; if (tmp > 0xFF) tmp = 0xFF; -- 2.54.0