Merge tag 'pwm/for-6.19-rc7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux

Pull pwm fixes and a maintainer update from Uwe Kleine-König:

 - pwm: Ensure ioctl() returns a negative errno on error

   This affects two ioctls on /dev/pwmchipX where the return value of
   copy_to_user() was passed to userspace. This is fixed to return
   -EFAULT now instead.

 - pwm: max7360: Populate missing .sizeof_wfhw in max7360_pwm_ops

   This fixes an oversight in the original commit that added support for
   the max7360 driver (d93a75d: "pwm: max7360: Add MAX7360 PWM
   support"). There is no user-visible effect because the .sizeof_wfhw
   member is just a safe guard that the memory provided by the core is
   big enough. While it currently is big enough and there is no reason
   to assume that will change, doing that correctly is necessary.

 - MAINTAINERS: Add Michal Wilczynski as reviewer for PWM rust drivers

   Michal cares for the Rust parts of the pwm subsystem. Several of the
   patches sent recently for the (for now) only Rust pwm driver did not
   add Michal to Cc which resulted in the patches waiting for review as
   I thought Michal would care but he wasn't aware of them.

* tag 'pwm/for-6.19-rc7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux:
  MAINTAINERS: Add myself as reviewer for PWM rust drivers
  pwm: max7360: Populate missing .sizeof_wfhw in max7360_pwm_ops
  pwm: Ensure ioctl() returns a negative errno on error

Author: torvalds

MAINTAINERS

@@ -21103,6 +21103,10 @@ S:	Maintained
 F:	rust/helpers/pwm.c
 F:	rust/kernel/pwm.rs
 
+PWM SUBSYSTEM DRIVERS [RUST]
+R:	Michal Wilczynski <m.wilczynski@samsung.com>
+F:	drivers/pwm/*.rs
+
 PXA GPIO DRIVER
 M:	Robert Jarzmik <robert.jarzmik@free.fr>
 L:	linux-gpio@vger.kernel.org

drivers/pwm/core.c

@@ -2295,8 +2295,9 @@ static long pwm_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long ar
 				.duty_offset_ns = wf.duty_offset_ns,
 			};
 
-			return copy_to_user((struct pwmchip_waveform __user *)arg,
-					    &cwf, sizeof(cwf));
+			ret = copy_to_user((struct pwmchip_waveform __user *)arg,
+					   &cwf, sizeof(cwf));
+			return ret ? -EFAULT : 0;
 		}
 
 	case PWM_IOCTL_GETWF:
@@ -2329,8 +2330,9 @@ static long pwm_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long ar
 				.duty_offset_ns = wf.duty_offset_ns,
 			};
 
-			return copy_to_user((struct pwmchip_waveform __user *)arg,
-					    &cwf, sizeof(cwf));
+			ret = copy_to_user((struct pwmchip_waveform __user *)arg,
+					   &cwf, sizeof(cwf));
+			return ret ? -EFAULT : 0;
 		}
 
 	case PWM_IOCTL_SETROUNDEDWF:

drivers/pwm/pwm-max7360.c

@@ -153,6 +153,7 @@ static int max7360_pwm_read_waveform(struct pwm_chip *chip,
 }
 
 static const struct pwm_ops max7360_pwm_ops = {
+	.sizeof_wfhw = sizeof(struct max7360_pwm_waveform),
 	.request = max7360_pwm_request,
 	.round_waveform_tohw = max7360_pwm_round_waveform_tohw,
 	.round_waveform_fromhw = max7360_pwm_round_waveform_fromhw,