linux-kernel - Re: [PATCH][next] mtd: rawnand: ensure return variable is initialized

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Date:   Tue, 8 Jun 2021 09:10:18 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Colin King <colin.king@...onical.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mtd: rawnand: ensure return variable is initialized

On Mon, Jun 07, 2021 at 08:57:11AM +0200, Miquel Raynal wrote:
> 
> In the ONFI specification, the sdr_timing_mode field is defined as
> follow:
> 
> SDR timing mode support
> BIT  VALUE MEANING
> 6-15 N/A   Reserved (0)
> 5    1     supports timing mode 5
> 4    1     supports timing mode 4
> 3    1     supports timing mode 3
> 2    1     supports timing mode 2
> 1    1     supports timing mode 1
> 0    1     supports timing mode 0, shall be 1
> 
> IOW sdr_timing_modes *cannot* be 0, or it is a truly deep and crazily
> impacting hardware bug (so far I am not aware of any chip not returning
> the right timing mode 0 value). Hence my proposal to turn best_mode as
> unsigned. I honestly don't know what is the best option here and am
> fully open to other suggestions to silence the robot.

If the hardware is broken we should just return -EINVAL.

regards,
dan carpenter