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Message-ID: <9fda4a263951753ca7c8d90b454f00f6815b64c6.camel@mediatek.com>
Date: Thu, 2 Oct 2025 08:00:21 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
To: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"wkon.kim@...sung.com" <wkon.kim@...sung.com>,
"James.Bottomley@...senPartnership.com"
<James.Bottomley@...senPartnership.com>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>, "martin.petersen@...cle.com"
<martin.petersen@...cle.com>
Subject: Re: [PATCH] ufs: core: Initialize a variable mode for PA_PWRMODE
On Thu, 2025-10-02 at 16:00 +0900, Wonkon Kim wrote:
>
> If ufshcd_dme_get() fails uic cmd error,
> a variable mode has a garbage value.
> It may return unintended result for pwr mode restore.
>
> Initialize it as 0 and will return true when ufshcd_dme_get() fails,
> because PA power mode 0 is not defined.
>
> Signed-off-by: Wonkon Kim <wkon.kim@...sung.com>
> ---
> drivers/ufs/core/ufshcd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 9a43102b2b21..a4438a3cb73a 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -6581,7 +6581,7 @@ static inline void
> ufshcd_recover_pm_error(struct ufs_hba *hba)
> static bool ufshcd_is_pwr_mode_restore_needed(struct ufs_hba *hba)
> {
> struct ufs_pa_layer_attr *pwr_info = &hba->pwr_info;
> - u32 mode;
> + u32 mode = 0;
>
> ufshcd_dme_get(hba, UIC_ARG_MIB(PA_PWRMODE), &mode);
>
> --
> 2.34.1
>
Reviewed-by: Peter Wang <peter.wang@...iatek.com>
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