# \[PATCH v3 1/2\] staging: sm750fb: return -ETIMEDOUT on timeout in de\_wait functions

- From: Hungyu Lin \<hidden\>
- Date: 2026-04-27 05:47:54 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2026/04/3530370
- Thread: https://ratatoskr.run/linux-fbdev/2026/04/3530371/t.md

```text
The hw_sm750le_de_wait() and hw_sm750_de_wait() functions return -1
when a timeout occurs. Replace these with -ETIMEDOUT to use a proper
errno value and better describe the error condition.

All callers check the return value as non-zero, so this change does
not alter existing behavior.

Signed-off-by: Hungyu Lin <redacted>
---
 drivers/staging/sm750fb/sm750_hw.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/sm750fb/sm750_hw.c b/drivers/staging/sm750fb/sm750_hw.c
index a2798d428663..ab3d4a2bf1a6 100644
--- a/drivers/staging/sm750fb/sm750_hw.c
+++ b/drivers/staging/sm750fb/sm750_hw.c
@@ -501,8 +501,8 @@ int hw_sm750le_de_wait(void)
 		    (DE_STATE2_DE_FIFO_EMPTY | DE_STATE2_DE_MEM_FIFO_EMPTY))
 			return 0;
 	}
-	/* timeout error */
-	return -1;
+
+	return -ETIMEDOUT;
 }
 
 int hw_sm750_de_wait(void)
@@ -519,8 +519,8 @@ int hw_sm750_de_wait(void)
 		    (SYSTEM_CTRL_DE_FIFO_EMPTY | SYSTEM_CTRL_DE_MEM_FIFO_EMPTY))
 			return 0;
 	}
-	/* timeout error */
-	return -1;
+
+	return -ETIMEDOUT;
 }
 
 int hw_sm750_pan_display(struct lynxfb_crtc *crtc,
-- 
2.34.1

```