On Wed, Feb 06, 2019 at 06:39:59PM +0100, Enric Balletbo i Serra wrote:
> From: Guenter Roeck
>
> While ioctls normally return a negative error or 0 on success, this is not
> the case for CROS_EC_DEV_IOCXCMD in the cros_ec driver, which returns the
> number of bytes read instead. However, CROS_EC_DEV_IOCRDMEM in the same
> driver does not return the number of byte read on success. This is both
> inconsistent and problematic, since the amount of returned data can be
> dynamic. Have it return the number of data bytes for consistency.
>
> Signed-off-by: Guenter Roeck
> Signed-off-by: Enric Balletbo i Serra
Reviewed-by: Benson Leung
> ---
> Hi,
>
> This patch was send long time ago and never landed to mainline [1]. This
> is a second attempt. Originally was made to apply on platform/chrome but
> after the recent changes we did it should go now throught the MFD
> subsystem. Without this patch userspace tools like ectool doesn't work
> as expected.
>
> Best regards,
> Enric
>
> [1] https://lore.kernel.org/patchwork/patch/665211/
>
> Changes in v2:
> - Adapt and rebase to current mainline.
>
> drivers/mfd/cros_ec_dev.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index ed809fc97df8..d275deaecb12 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -224,7 +224,7 @@ static long ec_device_ioctl_readmem(struct cros_ec_dev
> *ec, void __user *arg)
> if (copy_to_user((void __user *)arg, _mem, sizeof(s_mem)))
> return -EFAULT;
>
> - return 0;
> + return num;
> }
>
> static long ec_device_ioctl(struct file *filp, unsigned int cmd,
> --
> 2.20.1
>
--
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
ble...@google.com
Chromium OS Project
ble...@chromium.org
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