linux-kernel - Re: [PATCH 1/2] staging: zram: fix handle_pending_slot_free() and zram_reset

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Message-ID: <20130913091710.GA2225@swordfish>
Date:	Fri, 13 Sep 2013 12:17:11 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Minchan Kim <minchan@...nel.org>,
	driverdev-devel@...uxdriverproject.org,
	Jerome Marchand <jmarchan@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] staging: zram: fix handle_pending_slot_free() and
 zram_reset_device() race

On (09/12/13 15:12), Greg KH wrote:
> On Wed, Sep 11, 2013 at 02:12:50AM +0300, Sergey Senozhatsky wrote:
> > Dan Carpenter noted that handle_pending_slot_free() is racy with
> > zram_reset_device(). Take write init_lock in zram_slot_free(), thus
> > preventing any concurrent zram_slot_free(), zram_bvec_rw() or
> > zram_reset_device(). This also allows to safely check zram->init_done
> > in handle_pending_slot_free().
> > 
> > Initial intention was to minimze number of handle_pending_slot_free()
> > call from zram_bvec_rw(), which were slowing down READ requests due to
> > slot_free_lock spin lock. Jerome Marchand suggested to remove
> > handle_pending_slot_free() from zram_bvec_rw().
> > 
> > Link: https://lkml.org/lkml/2013/9/9/172
> > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> 
> I have multiple versions of this and the other zram patches from you,
> with no idea of which to accept.

yes, please, drop all patches. I did not Cc you in these two
patches to stop spamming your inbox with multiply versions.
I will send them back to you as soon as I get positive feedback.


> So, I'm going to drop them all, can you please resend what you wish to
> submit, and in the future, be a bit more obvious with your "vN"
> markings?
>

sorry for that.

	-ss

> thanks,
> 
> greg k-h
> 
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