linux-kernel - Re: [PATCH] scsi: ufs: core: Simplify param_set_mcq

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Date:   Wed, 26 Apr 2023 09:44:34 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     keosung.park@...sung.com, ALIM AKHTAR <alim.akhtar@...sung.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "quic_asutoshd@...cinc.com" <quic_asutoshd@...cinc.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: ufs: core: Simplify param_set_mcq_mode()

On 4/25/23 22:21, Keoseong Park wrote:
> This function does not require the "ret" variable because it returns
> only the result of param_set_bool().
> 
> Remove unnecessary "ret" variable and simplify the code.
> 
> Signed-off-by: Keoseong Park <keosung.park@...sung.com>
> ---
>   drivers/ufs/core/ufshcd.c | 8 +-------
>   1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 9434328ba323..46c4ed478ad0 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -108,13 +108,7 @@ static bool is_mcq_supported(struct ufs_hba *hba)
>   
>   static int param_set_mcq_mode(const char *val, const struct kernel_param *kp)
>   {
> -	int ret;
> -
> -	ret = param_set_bool(val, kp);
> -	if (ret)
> -		return ret;
> -
> -	return 0;
> +	return param_set_bool(val, kp);
>   }
>   
>   static const struct kernel_param_ops mcq_mode_ops = {

Why do we even have the param_set_mcq_mode() callback? Has it been considered
to remove mcq_mode_ops as in the untested patch below?

Thanks,

Bart.

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 7b1e7d7091ff..2b8c2613f7d7 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -98,7 +98,7 @@
  /* Polling time to wait for fDeviceInit */
  #define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */

-/* UFSHC 4.0 compliant HC support this mode, refer param_set_mcq_mode() */
+/* UFSHC 4.0 compliant HC support this mode. */
  static bool use_mcq_mode = true;

  static bool is_mcq_supported(struct ufs_hba *hba)
@@ -106,23 +106,7 @@ static bool is_mcq_supported(struct ufs_hba *hba)
  	return hba->mcq_sup && use_mcq_mode;
  }

-static int param_set_mcq_mode(const char *val, const struct kernel_param *kp)
-{
-	int ret;
-
-	ret = param_set_bool(val, kp);
-	if (ret)
-		return ret;
-
-	return 0;
-}
-
-static const struct kernel_param_ops mcq_mode_ops = {
-	.set = param_set_mcq_mode,
-	.get = param_get_bool,
-};
-
-module_param_cb(use_mcq_mode, &mcq_mode_ops, &use_mcq_mode, 0644);
+module_param(use_mcq_mode, bool, 0644);
  MODULE_PARM_DESC(use_mcq_mode, "Control MCQ mode for controllers starting from UFSHCI 4.0. 1 - enable MCQ, 0 - disable MCQ. MCQ is enabled by default");

  #define ufshcd_toggle_vreg(_dev, _vreg, _on)				\