linux-kernel - RE: [PATCH v2 3/3] scsi: ufs: Remove redundant checks of !hba in suspend/resume callbacks

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Date:   Wed, 3 Mar 2021 07:19:22 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Can Guo <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "hongwus@...eaurora.org" <hongwus@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 3/3] scsi: ufs: Remove redundant checks of !hba in
 suspend/resume callbacks

> 
> Runtime and system suspend/resume can only come after hba probe invokes
> platform_set_drvdata(pdev, hba), meaning hba cannot be NULL in these PM
> callbacks, so remove the checks of !hba.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
Reviewed-by: Avri Altman <avri.altman@....com>


> ---
>  drivers/scsi/ufs/ufshcd.c | 21 ---------------------
>  1 file changed, 21 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 013eb73..2517ef1 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -95,8 +95,6 @@
>                        16, 4, buf, __len, false);                        \
>  } while (0)
> 
> -static bool early_suspend;
> -
>  int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
>                      const char *prefix)
>  {
> @@ -8978,11 +8976,6 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
>         int ret = 0;
>         ktime_t start = ktime_get();
> 
> -       if (!hba) {
> -               early_suspend = true;
> -               return 0;
> -       }
> -
>         down(&hba->host_sem);
> 
>         if (!hba->is_powered)
> @@ -9034,14 +9027,6 @@ int ufshcd_system_resume(struct ufs_hba *hba)
>         int ret = 0;
>         ktime_t start = ktime_get();
> 
> -       if (!hba)
> -               return -EINVAL;
> -
> -       if (unlikely(early_suspend)) {
> -               early_suspend = false;
> -               down(&hba->host_sem);
> -       }
> -
>         if (!hba->is_powered || pm_runtime_suspended(hba->dev))
>                 /*
>                  * Let the runtime resume take care of resuming
> @@ -9074,9 +9059,6 @@ int ufshcd_runtime_suspend(struct ufs_hba *hba)
>         int ret = 0;
>         ktime_t start = ktime_get();
> 
> -       if (!hba)
> -               return -EINVAL;
> -
>         if (!hba->is_powered)
>                 goto out;
>         else
> @@ -9115,9 +9097,6 @@ int ufshcd_runtime_resume(struct ufs_hba *hba)
>         int ret = 0;
>         ktime_t start = ktime_get();
> 
> -       if (!hba)
> -               return -EINVAL;
> -
>         if (!hba->is_powered)
>                 goto out;
>         else
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
> Foundation Collaborative Project.