linux-kernel - Re: [PATCH] scsi: ufs: add a quirk to disable FUA support

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Date:   Wed, 1 Jun 2022 10:06:23 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <beanhuo@...ron.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Can Guo <cang@...eaurora.org>
Subject: Re: [PATCH] scsi: ufs: add a quirk to disable FUA support

On 06/01, Bart Van Assche wrote:
> On 5/31/22 22:24, Adrian Hunter wrote:
> > On 31/05/22 23:10, Jaegeuk Kim wrote:
> > > +	/*
> > > +	 * This quirk disables FUA support.
> > > +	 */
> > > +	UFSHCD_QUIRK_BROKEN_FUA				= 1 << 17,
> > 
> > Wouldn't it be more appropriate to make it a UFS_DEVICE_QUIRK_
> > since it presumably depends on the UFS device not the host controller?
> > 
> > Also, as already commented by others, there needs to be a user of
> > the quirk
> 
> Another possibility is to use the generic SCSI blacklist mechanism. See also
> the scsi_static_device_list array. See also /proc/scsi/device_info. From
> scsi_devinfo.c:
> 
> /*
>  * proc_scsi_dev_info_write - allow additions to scsi_dev_info_list via
>  * /proc.
>  *
>  * Description: Adds a black/white list entry for vendor and model with
>  * an integer value of flag to the scsi device info list.
>  * To use, echo "vendor:model:flag" > /proc/scsi/device_info
>  */

Good to know. Thank you, Bart.

> 
> Thanks,
> 
> Bart.