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SubjectRe: [PATCH] gpio: mockup: use simple_read_from_buffer() in debugfs read callback
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On 3/28/2019 4:30 PM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Calling read() for a single byte read will return 2 currently. Use
> simple_read_from_buffer() which correctly handles all sizes.
>
> Fixes: 2a9e27408e12 ("gpio: mockup: rework debugfs interface")
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
> drivers/gpio/gpio-mockup.c | 7 +------
> 1 file changed, 1 insertion(+), 6 deletions(-)
>
> diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
> index 74ba8b1d71d8..859585dce5c9 100644
> --- a/drivers/gpio/gpio-mockup.c
> +++ b/drivers/gpio/gpio-mockup.c
> @@ -219,12 +219,7 @@ static ssize_t gpio_mockup_debugfs_read(struct file *file,
> val = gpio_mockup_get(gc, priv->offset);
> cnt = snprintf(buf, sizeof(buf), "%d\n", val);


why \n is inserted in the buf..

rv variable is unused now.

>
> - rv = copy_to_user(usr_buf, buf, cnt);
> - if (rv)
> - return rv;
> -
> - *ppos += cnt;
> - return cnt;
> + return simple_read_from_buffer(usr_buf, size, ppos, buf, cnt);



Looks good to me.
Remove the unused variable.

Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>

-Mukesh

> }
>
> static ssize_t gpio_mockup_debugfs_write(struct file *file,

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