[PATCH v2 0/2] staging: sm750fb: Remove unused return values from functions

Modifies the return type of different static functions to void and
deletes unused return variables as the return value is being ignored 
in all subsequent function calls thus not useful to have a return type.

This improves code readability and maintainability.

Changes in v2:
- Ammend wording in cover letter.
Suggested-by: Julia Lawall <julia.lawall@inria.fr>
- Drop variable 'ret' entirely as it is unused.
Suggested-by: Julia Lawall <julia.lawall@inria.fr>, Greg Kroah-Hartman
[off-list ref], Dan Carpenter [off-list ref] 

Dorcas AnonoLitunya (2):
  staging: sm750fb: Remove unused return value in
    display_control_adjust_sm750le()
  staging: sm750fb: Remove unused return variable in
    program_mode_registers()

 drivers/staging/sm750fb/ddk750_mode.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

-- 
2.42.0.345.gaab89be2eb

Modifies the return type of display_control_adjust_sm750le()
to void from unsigned long as the return value is being ignored in
all subsequent function calls.

This improves code readability and maintainability.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dorcas AnonoLitunya <redacted>
---
 drivers/staging/sm750fb/ddk750_mode.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/staging/sm750fb/ddk750_mode.c b/drivers/staging/sm750fb/ddk750_mode.c
index bcdd291d25c9..83ace6cc9583 100644
--- a/drivers/staging/sm750fb/ddk750_mode.c
+++ b/drivers/staging/sm750fb/ddk750_mode.c

@@ -13,7 +13,7 @@
  * HW only supports 7 predefined pixel clocks, and clock select is
  * in bit 29:27 of Display Control register.
  */
-static unsigned long
+static void
 display_control_adjust_sm750le(struct mode_parameter *mode_param,
 			       unsigned long disp_control)
 {

@@ -70,8 +70,6 @@ display_control_adjust_sm750le(struct mode_parameter *mode_param,
 	disp_control |= DISPLAY_CTRL_CLOCK_PHASE;
 
 	poke32(CRT_DISPLAY_CTRL, disp_control);
-
-	return disp_control;
 }
 
 /* only timing related registers will be  programed */

-- 
2.42.0.345.gaab89be2eb

Drops variable ret as it is unused in the code. This therefore modifies
the return type of program_mode_registers() to void from int since the
return value is being ignored in all function calls. This improves code
readability and maintainability.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dorcas AnonoLitunya <redacted>
---
Changes in v2:
- Drop variable 'ret' entirely as it is unused.
Suggested-by: Julia Lawall <julia.lawall@inria.fr>, Greg Kroah-Hartman
[off-list ref], Dan Carpenter [off-list ref]

 drivers/staging/sm750fb/ddk750_mode.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/sm750fb/ddk750_mode.c b/drivers/staging/sm750fb/ddk750_mode.c
index 83ace6cc9583..4278f9a826ab 100644
--- a/drivers/staging/sm750fb/ddk750_mode.c
+++ b/drivers/staging/sm750fb/ddk750_mode.c

@@ -73,10 +73,9 @@ display_control_adjust_sm750le(struct mode_parameter *mode_param,
 }
 
 /* only timing related registers will be  programed */
-static int program_mode_registers(struct mode_parameter *mode_param,
-				  struct pll_value *pll)
+static void program_mode_registers(struct mode_parameter *mode_param,
+				   struct pll_value *pll)
 {
-	int ret = 0;
 	int cnt = 0;
 	unsigned int tmp, reg;
 

@@ -199,10 +198,7 @@ static int program_mode_registers(struct mode_parameter *mode_param,
 				break;
 			poke32(PANEL_DISPLAY_CTRL, tmp | reg);
 		}
-	} else {
-		ret = -1;
 	}
-	return ret;
 }
 
 int ddk750_set_mode_timing(struct mode_parameter *parm, enum clock_type clock)

-- 
2.42.0.345.gaab89be2eb

On Thu, Oct 19, 2023 at 01:13:36PM +0300, Dorcas AnonoLitunya wrote:

Modifies the return type of display_control_adjust_sm750le()
to void from unsigned long as the return value is being ignored in
all subsequent function calls.

This improves code readability and maintainability.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dorcas AnonoLitunya <redacted>
---
 drivers/staging/sm750fb/ddk750_mode.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

This patch doesn't apply against my latest branch.  Please rebase it and
resend.

thanks,

greg k-h

On 21/10/2023 13:01, Greg Kroah-Hartman wrote:

On Thu, Oct 19, 2023 at 01:13:36PM +0300, Dorcas AnonoLitunya wrote:

quoted

Modifies the return type of display_control_adjust_sm750le()
to void from unsigned long as the return value is being ignored in
all subsequent function calls.

This improves code readability and maintainability.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dorcas AnonoLitunya <redacted>
---
  drivers/staging/sm750fb/ddk750_mode.c | 4 +---
  1 file changed, 1 insertion(+), 3 deletions(-)

This patch doesn't apply against my latest branch.  Please rebase it and
resend.

thanks,

greg k-h

Hi Greg,

Sorry for the delay. Was occupied on the project starter tasks. I have 
rebased the patch and resent it. Thanks!


Dorcas