Re: [PATCH 1/6] staging: sm750fb: hw_sm750le_de_wait: return -ETIMEDOUT on timeout

[Dan Carpenter <dan.carpenter@linaro.org>]

On Wed, Mar 04, 2026 at 11:05:24PM +0530, Soham Kute wrote:
> Return -ETIMEDOUT instead of -1 when the DE engine poll loop
> times out. The callers check for non-zero return value and
> propagate the error code back to their callers.
> 

They don't propagate the error back.  The callers do:

drivers/staging/sm750fb/sm750_accel.c
    87  int sm750_hw_fillrect(struct lynx_accel *accel,
    88                        u32 base, u32 pitch, u32 Bpp,
    89                        u32 x, u32 y, u32 width, u32 height,
    90                        u32 color, u32 rop)
    91  {
    92          u32 de_ctrl;
    93  
    94          if (accel->de_wait() != 0) {
    95                  /*
    96                   * int time wait and always busy,seems hardware
    97                   * got something error
    98                   */
    99                  pr_debug("De engine always busy\n");
   100                  return -1;
   101          }

They return -1.  Propagating the errors means:

	ret = accel->de_wait();
	if (ret)
		return ret;

Also this is a v3 patch, it needs v3 in the subject and a little
description of what changed.

https://staticthinking.wordpress.com/2022/07/27/how-to-send-a-v2-patch/

regards,
dan carpenter