linux-kernel - Re: [PATCH]drivers/ata/libata-eh.c:1509 unneeded memset()

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Message-ID: <5543f88f1001111141r5375d2a3kd726d2b70e124b94@mail.gmail.com>
Date:	Mon, 11 Jan 2010 11:41:35 -0800
From:	Marc Bejarano <beej@...j.org>
To:	René Bolldorf <xsecute@...glemail.com>
Cc:	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	James Bottomley <James.Bottomley@...e.de>,
	linux-kernel@...r.kernel.org, jgarzik@...ox.com
Subject: Re: [PATCH]drivers/ata/libata-eh.c:1509 unneeded memset()

and once more in plain text.  (sorry vger)

2010/1/11 Marc Bejarano <beej@...j.org>:
> oops.  seems that GMANE's reply function only goes to a single "newsgroup".
>  original recipients re-added.
> marc
> ----
> From: Marc Bejarano <beej <at> beej.org>
> Subject: Re: [PATCH]drivers/ata/libata-eh.c:1509 unneeded memset()
> Newsgroups: gmane.linux.scsi
> Date: 2010-01-08 22:21:09 GMT (2 days, 20 hours and 40 minutes ago)
>
> René Bolldorf <xsecute <at> googlemail.com> writes:
>> On 01/08/10 16:28, James Bottomley wrote:
>> > On Thu, 2010-01-07 at 14:15 -0500, Jeff Garzik wrote:
>> >> On 12/30/2009 05:59 PM, René Bolldorf wrote:
>> >>> We don't need this .
>
>> >>> - /* FIXME: is this needed? */
>> >>> - memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
>> >>
>> >> I need a little bit more detail than an unqualified statement...  Did
>> >> you audit all paths leading to this code point?
>
>> > But one also here:
>> >
>> > u8 *sense_buffer = dev->link->ap->sector_buf;
>> > [...]
>> > err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
>> >
>> > Which doesn't look OK because it looks like the sector_buf isn't cleared
>> > (and it is reused).
>> >
>> > James
>> >
>> >
>>
>> Thank's, you're right. I have overseen this, sry for that.
>
> René: perhaps you'd like to submit a patch that substitutes FIXME comment
> for one that explains why the memset is needed, crediting James in the
> description?  we may as well gain something permanent from this discussion
> that you started :)
>
> cheers,
> marc
>
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