linux-kernel - Re: [PATCH v2] mtd: spi-nor: core: Skip setting erase types when SPI_NOR_NO_ERASE is set

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Date:   Fri, 29 Apr 2022 11:44:28 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
CC:     <michael@...le.cc>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH v2] mtd: spi-nor: core: Skip setting erase types when
 SPI_NOR_NO_ERASE is set

On 02/04/22 01:35AM, Pratyush Yadav wrote:
> On 08/03/22 11:11AM, Tudor Ambarus wrote:
> > Even if SPI_NOR_NO_ERASE was specified at flash declaration, the erase
> > type of size nor->info->sector_size was incorrectly set as supported.
> > Don't set erase types when SPI_NOR_NO_ERASE is set.
> 
> Does this have any practical implications? Since we set MTD_NO_ERASE, 
> erase should never be called for this flash anyway, right?
> 
> > 
> > Fixes: b199489d37b2 ("mtd: spi-nor: add the framework for SPI NOR")
> > Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> > Cc: stable@...r.kernel.org
> > ---
> > v2:
> > - add comment, update commit message, split change in individual commit
> > - add fixes tag and cc to stable.
> > 
> >  drivers/mtd/spi-nor/core.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> > index b4f141ad9c9c..64cf7b9df621 100644
> > --- a/drivers/mtd/spi-nor/core.c
> > +++ b/drivers/mtd/spi-nor/core.c
> > @@ -2392,6 +2392,10 @@ static void spi_nor_no_sfdp_init_params(struct spi_nor *nor)
> >  					SPINOR_OP_PP, SNOR_PROTO_8_8_8_DTR);
> >  	}
> >  
> > +	/* Skip setting erase types when SPI_NOR_NO_ERASE is set. */
> > +	if (nor->info->flags & SPI_NOR_NO_ERASE)
> > +		return;

Can you instead do

	if (!(nor->info->flags & SPI_NOR_NO_ERASE)) {
		...
	}

This way when someone adds code to the bottom of this function that sets 
something other than erase types it will execute for flashes with 
SPI_NOR_NO_ERASE as well.

> > +
> >  	/*
> >  	 * Sector Erase settings. Sort Erase Types in ascending order, with the
> >  	 * smallest erase size starting at BIT(0).
> > -- 
> > 2.25.1
> > 
> 
> -- 
> Regards,
> Pratyush Yadav
> Texas Instruments Inc.
> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.

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