netdev - Re: [PATCH 5/5] mtd: Stop updating erase_info->state and calling mtd_erase

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Message-ID: <20180213091714.5eca4f45@bbrezillon>
Date:   Tue, 13 Feb 2018 09:17:14 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-mtd@...ts.infradead.org, Joern Engel <joern@...ybastard.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
        Edward Cree <ecree@...arflare.com>,
        Bert Kenward <bkenward@...arflare.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
        devel@...verdev.osuosl.org
Subject: Re: [PATCH 5/5] mtd: Stop updating erase_info->state and calling
 mtd_erase_callback()

On Tue, 13 Feb 2018 08:42:46 +0100
Miquel Raynal <miquel.raynal@...tlin.com> wrote:

> Hi Boris,
> 
> Just a few comments about the form.
> 
> Otherwise:
> Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
> 
> 
> > diff --git a/drivers/mtd/devices/lart.c b/drivers/mtd/devices/lart.c
> > index 555b94406e0b..3d6c8ffd351f 100644
> > --- a/drivers/mtd/devices/lart.c
> > +++ b/drivers/mtd/devices/lart.c
> > @@ -415,7 +415,6 @@ static int flash_erase (struct mtd_info *mtd,struct erase_info *instr)
> >  	 {
> >  		if (!erase_block (addr))
> >  		  {
> > -			 instr->state = MTD_ERASE_FAILED;
> >  			 return (-EIO);
> >  		  }  
> 
> You can also safely remove these '{' '}'

Well, this patch is not about fixing coding style issues, otherwise I'd
have a lot more work on this driver :-)

> 
> >  
> > @@ -425,9 +424,6 @@ static int flash_erase (struct mtd_info *mtd,struct erase_info *instr)
> >  		if (addr == mtd->eraseregions[i].offset + (mtd->eraseregions[i].erasesize * mtd->eraseregions[i].numblocks)) i++;
> >  	 }
> >  
> > -   instr->state = MTD_ERASE_DONE;
> > -   mtd_erase_callback(instr);
> > -
> >     return (0);
> >  }
> >  
> > diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
> > index 5dc8bd042cc5..aaaeaae01e1d 100644
> > --- a/drivers/mtd/devices/mtd_dataflash.c
> > +++ b/drivers/mtd/devices/mtd_dataflash.c
> > @@ -220,10 +220,6 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
> >  	}
> >  	mutex_unlock(&priv->lock);
> >  
> > -	/* Inform MTD subsystem that erase is complete */
> > -	instr->state = MTD_ERASE_DONE;
> > -	mtd_erase_callback(instr);
> > -
> >  	return 0;
> >  }
> >  
> > diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c
> > index 0bf4aeaf0cb8..efef43c6684b 100644
> > --- a/drivers/mtd/devices/mtdram.c
> > +++ b/drivers/mtd/devices/mtdram.c
> > @@ -60,8 +60,6 @@ static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
> >  	if (check_offs_len(mtd, instr->addr, instr->len))
> >  		return -EINVAL;
> >  	memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
> > -	instr->state = MTD_ERASE_DONE;
> > -	mtd_erase_callback(instr);  
> 
> Space ?

I could add a blank line, but again, I'm just following the coding style
in place in this file :-).

> 
> >  	return 0;
> >  }
> >  
> > diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c
> > index 7287696a21f9..a963c88d392d 100644
> > --- a/drivers/mtd/devices/phram.c
> > +++ b/drivers/mtd/devices/phram.c
> > @@ -44,8 +44,6 @@ static int phram_erase(struct mtd_info *mtd, struct erase_info *instr)
> >  	 * I don't feel at all ashamed. This kind of thing is possible anyway
> >  	 * with flash, but unlikely.
> >  	 */  
> 
> Not sure this comment is still relevant? Maybe you could remove it
> or at least change it? 
> 
> > -	instr->state = MTD_ERASE_DONE;
> > -	mtd_erase_callback(instr);  
> 
> Space ?
> 
> >  	return 0;
> >  }
> >  
> > diff --git a/drivers/mtd/devices/pmc551.c b/drivers/mtd/devices/pmc551.c
> > index cadea0620cd0..5d842cbca3de 100644
> > --- a/drivers/mtd/devices/pmc551.c
> > +++ b/drivers/mtd/devices/pmc551.c
> > @@ -184,12 +184,10 @@ static int pmc551_erase(struct mtd_info *mtd, struct erase_info *instr)
> >  	}
> >  
> >        out:
> > -	instr->state = MTD_ERASE_DONE;
> >  #ifdef CONFIG_MTD_PMC551_DEBUG
> >  	printk(KERN_DEBUG "pmc551_erase() done\n");
> >  #endif
> >  
> > -	mtd_erase_callback(instr);
> >  	return 0;
> >  }
> >  
> > diff --git a/drivers/mtd/devices/powernv_flash.c b/drivers/mtd/devices/powernv_flash.c
> > index 26f9feaa5d17..5f383630c16f 100644
> > --- a/drivers/mtd/devices/powernv_flash.c
> > +++ b/drivers/mtd/devices/powernv_flash.c
> > @@ -175,19 +175,12 @@ static int powernv_flash_erase(struct mtd_info *mtd, struct erase_info *erase)
> >  {
> >  	int rc;
> >  
> > -	erase->state = MTD_ERASING;
> > -
> >  	/* todo: register our own notifier to do a true async implementation */
> >  	rc =  powernv_flash_async_op(mtd, FLASH_OP_ERASE, erase->addr,
> >  			erase->len, NULL, NULL);  
> 
> Are you sure this is still needed? Maybe this should go away in your
> first patch?

Hm, indeed. This comment should be dropped.

> 
> > -
> > -	if (rc) {
> > +	if (rc)
> >  		erase->fail_addr = erase->addr;
> > -		erase->state = MTD_ERASE_FAILED;
> > -	} else {
> > -		erase->state = MTD_ERASE_DONE;
> > -	}
> > -	mtd_erase_callback(erase);
> > +
> >  	return rc;
> >  }
> >  
> > diff --git a/drivers/mtd/devices/slram.c b/drivers/mtd/devices/slram.c
> > index 0ec85f316d24..2f05e1801047 100644
> > --- a/drivers/mtd/devices/slram.c
> > +++ b/drivers/mtd/devices/slram.c
> > @@ -88,8 +88,6 @@ static int slram_erase(struct mtd_info *mtd, struct erase_info *instr)
> >  	 * I don't feel at all ashamed. This kind of thing is possible anyway
> >  	 * with flash, but unlikely.
> >  	 */  
> 
> Same with this comment.

Actually, I'm not sure I understand that comment, but I guess it's
talking about races between read/write and erase paths, so nothing
related to the changed I'm doing here.

> 
> > -	instr->state = MTD_ERASE_DONE;
> > -	mtd_erase_callback(instr);  
> 
> Space ?
> 
> >  	return(0);
> >  }
> >    
> 
> 
> 
> 



-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com