lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <51F14513.5030200@metafoo.de>
Date:	Thu, 25 Jul 2013 17:32:35 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	balbi@...com, george.cherian@...com,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>
Subject: Re: [PATCH 15/16] dmaengine: add transfered member to dma_async_tx_descriptor

On 07/25/2013 05:12 PM, Sebastian Andrzej Siewior wrote:
> On 07/25/2013 04:57 PM, Lars-Peter Clausen wrote:
>> I'm not sure that this will work. Once you've submitted the descriptor it is
>> owned by the dmaengine driver and you are not allowed to dereference it
>> anymore since the dmaengine driver might free the memory at any time. You
>> should only reference the descriptor by the cookie returned by submit().
> 
> I see. But it can't be reused before calling the callback if it is
> going to call the callback, right?
> So if this is a no-no, I'm left with an additional argument to the
> complete callback?

Hm, maybe using dmaengine_tx_status() and checking the residue field of the
state struct. transferred is basically len - residue.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ