From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: David Brownell <dbrownell@users.sourceforge.net>,
Eric Miao <eric.y.miao@gmail.com>,
Vasily Khoruzhick <anarsoul@gmail.com>,
Marek Vasut <marek.vasut@gmail.com>,
spi-devel-general@lists.sourceforge.net,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3] pxa2xx_spi: fix memory corruption
Date: Mon, 18 Jul 2011 11:10:30 +0100 [thread overview]
Message-ID: <20110718101030.GS23270@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20110715213106.GM2833@ponder.secretlab.ca>
On Fri, Jul 15, 2011 at 03:31:06PM -0600, Grant Likely wrote:
> ... plus care must be taken not to accidentally reload the line into
> cache after it has been pushed out for DMA, which is a risk on
> structures with embedded DMA buffers if other non-DMA elements end up
> in the same cache line. This is the situation I was wondering about.
I don't think it matters one bit in this case - we're not caring about
the actual data read/written in the DMA, we just need to do DMA to
keep the controller happy. That's especially true as we don't set the
address increment bit in the DMA command register, so we end up accessing
the same RAM location time and time again for each DMA transfer.
So please, merge the patch - it fixes a serious memory-scribbling bug.
next prev parent reply other threads:[~2011-07-18 10:10 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-09 21:14 [PATCH] pxa2xx_spi: fix memory corruption Vasily Khoruzhick
2011-07-09 23:05 ` Marek Vasut
2011-07-09 23:11 ` Russell King - ARM Linux
2011-07-10 7:14 ` Marek Vasut
[not found] ` <201107100914.45452.marek.vasut-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-07-10 7:57 ` Marek Vasut
2011-07-10 12:09 ` [PATCH v2] " Vasily Khoruzhick
2011-07-10 12:43 ` Marek Vasut
2011-07-10 13:09 ` Vasily Khoruzhick
2011-07-10 15:18 ` [PATCH v3] " Vasily Khoruzhick
[not found] ` <1310311099-24638-1-git-send-email-anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-07-14 12:17 ` Vasily Khoruzhick
[not found] ` <201107141517.36147.anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-07-14 12:21 ` Marek Vasut
2011-07-15 2:53 ` Grant Likely
2011-07-15 8:12 ` Russell King - ARM Linux
[not found] ` <20110715081242.GM23270-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2011-07-15 19:50 ` Grant Likely
2011-07-15 20:24 ` Russell King - ARM Linux
2011-07-15 21:31 ` Grant Likely
2011-07-18 10:10 ` Russell King - ARM Linux [this message]
2011-07-18 7:56 ` Vasily Khoruzhick
[not found] ` <201107181056.51782.anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-11-29 14:05 ` Vasily Khoruzhick
2011-11-29 14:31 ` Marek Vasut
2011-12-07 20:35 ` Wolfram Sang
[not found] ` <20111207203559.GB3744-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-12-08 8:19 ` [RESEND PATCH " Vasily Khoruzhick
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