linux-kernel - Re: [PATCH] zram: don't call idr_remove() from zram

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Message-ID: <20160115012545.GB1993@swordfish>
Date:	Fri, 15 Jan 2016 10:25:45 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Jerome Marchand <jmarchan@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Minchan Kim <minchan@...nel.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zram: don't call idr_remove() from zram_remove()

On (01/15/16 09:43), Sergey Senozhatsky wrote:
[..]
> a nano nitpick to add curly braces in the else clause.
> but, what is more important, may I please ask you to add -stable [4.2+]
> 
> > Signed-off-by: Jerome Marchand <jmarchan@...hat.com>
> + Cc: <stable@...r.kernel.org>
> 
> and to resend the patch?
> 

Jerome, please disregard my requests. Andrew has handled it. Thanks to both of you!

	-ss

> idr added in 4.2
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/block/zram/zram_drv.c?id=refs/tags/v4.2
> 
> 	-ss
> 
> > ---
> >  drivers/block/zram/zram_drv.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> > index 47915d7..5e86e1d 100644
> > --- a/drivers/block/zram/zram_drv.c
> > +++ b/drivers/block/zram/zram_drv.c
> > @@ -1325,7 +1325,6 @@ static int zram_remove(struct zram *zram)
> >  
> >  	pr_info("Removed device: %s\n", zram->disk->disk_name);
> >  
> > -	idr_remove(&zram_index_idr, zram->disk->first_minor);
> >  	blk_cleanup_queue(zram->disk->queue);
> >  	del_gendisk(zram->disk);
> >  	put_disk(zram->disk);
> > @@ -1367,9 +1366,10 @@ static ssize_t hot_remove_store(struct class *class,
> >  	mutex_lock(&zram_index_mutex);
> >  
> >  	zram = idr_find(&zram_index_idr, dev_id);
> > -	if (zram)
> > +	if (zram) {
> >  		ret = zram_remove(zram);
> > -	else
> > +		idr_remove(&zram_index_idr, dev_id);
> 
> +	} else {
> >  		ret = -ENODEV;
> +	}
> 
> 
> >  	mutex_unlock(&zram_index_mutex);
> > -- 
> > 2.5.0
> > 
>