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Date: Thu, 8 Dec 2022 09:28:41 -0800 From: Bart Van Assche <bvanassche@....org> To: Bean Huo <huobean@...il.com>, Arthur Simchaev <Arthur.Simchaev@....com>, martin.petersen@...cle.com Cc: beanhuo@...ron.com, linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v4 1/4] ufs: core: Remove redundant wb check On 12/8/22 04:22, Bean Huo wrote: > > On 08.12.22 12:31 AM, Bart Van Assche wrote: >> On 11/27/22 04:08, Arthur Simchaev wrote: >>> We used to use the extended-feature field in the device descriptor, >>> as an indication that the device supports ufs2.2 or later. >>> Remove that as this check is specifically done few lines above. >>> >>> Reviewed-by: Bean Huo <beanhuo@...ron.com> >>> Signed-off-by: Arthur Simchaev <Arthur.Simchaev@....com> >>> --- >>> drivers/ufs/core/ufshcd.c | 4 ---- >>> 1 file changed, 4 deletions(-) >>> >>> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c >>> index 2dbe249..2e47c69 100644 >>> --- a/drivers/ufs/core/ufshcd.c >>> +++ b/drivers/ufs/core/ufshcd.c >>> @@ -7608,10 +7608,6 @@ static void ufshcd_wb_probe(struct ufs_hba >>> *hba, const u8 *desc_buf) >>> (hba->dev_quirks & >>> UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES))) >>> goto wb_disabled; >>> - if (hba->desc_size[QUERY_DESC_IDN_DEVICE] < >>> - DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4) >>> - goto wb_disabled; >>> - >>> ext_ufs_feature = get_unaligned_be32(desc_buf + >>> DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP); >> >> Does this code really have to be removed? I see a check of the >> UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES flag above the removed >> code but no check of the descriptor size? >> > it is not necessary to check this, but if you have concern, we could > change to like this: > > > if (desc_buf[DEVICE_DESC_PARAM_LEN] < > DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4) > goto wb_disabled; > > then hba->desc_size could be removed. Hi Bean, My only concern is that this patch conflicts with the pending MCQ patch series. Since that conflict is unavoidable, let's keep this patch. Bart.
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