Re: [PATCH] staging: greybus: use sysfs_emit instead of sprintf in light.c

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Wed, Aug 19, 2026 at 05:44:55PM +0200, Tomasz Unger wrote:
> Per Documentation/filesystems/sysfs.rst, new implementations of
> show() methods should only use sysfs_emit() or sysfs_emit_at()
> when formatting the value to be returned to user space, since it
> is aware of the sysfs PAGE_SIZE buffer and includes sanity checks
> that sprintf() lacks.
> 
> This fixes fade_in_show() and fade_out_show() (both generated by
> the gb_lights_fade_attr() macro) and color_show().
> 
> Signed-off-by: Tomasz Unger <tomasz.unger@yahoo.pl>
> ---
> Verified with checkpatch.pl - no errors or warnings.
> Compiled the gb-light module successfully with CONFIG_GREYBUS_LIGHT=m
> and CONFIG_LEDS_CLASS_FLASH=m (both previously disabled).
> greybus.ko, led-class-flash.ko and gb-light.ko all load without
> errors in a QEMU environment (verified via insmod and lsmod, dmesg
> shows no errors). This confirms the modules load cleanly but does
> not exercise the changed sysfs show() code paths, which would
> require an actual Greybus light device bound to the driver.
> ---
>  drivers/staging/greybus/light.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Please see the archives for why this patch has been rejected in the
past.

sorry,

greg k-h