From: David Miller <davem@davemloft.net>
To: jens.axboe@oracle.com
Cc: fujita.tomonori@lab.ntt.co.jp, linux-kernel@vger.kernel.org,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH] SPARC64: fix iommu sg chaining
Date: Wed, 17 Oct 2007 04:04:14 -0700 (PDT) [thread overview]
Message-ID: <20071017.040414.55507057.davem@davemloft.net> (raw)
In-Reply-To: <20071017105840.GT5043@kernel.dk>
From: Jens Axboe <jens.axboe@oracle.com>
Date: Wed, 17 Oct 2007 12:58:40 +0200
> The problem is that you cannot zero the entire sg entry, because then
> you'd potentially overwrite the chain pointer.
>
> I'd propose just adding a
>
> sg_dma_address(sg) = 0;
> sg_dma_len(sg) = 0;
>
> there for now, or provide an arch_clear_sg_entry() helper if we need
> more killed.
The "chain pointer" is indicated by an sg->page with the low
bit set, but we're explicitly initializing it here to a
non-chain page pointer value.
What's the problem?
next prev parent reply other threads:[~2007-10-17 11:04 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-17 5:07 [PATCH] SPARC64: fix iommu sg chaining FUJITA Tomonori
2007-10-17 7:21 ` Jens Axboe
2007-10-17 8:33 ` David Miller
2007-10-17 8:42 ` David Miller
2007-10-17 8:45 ` Jens Axboe
2007-10-17 9:13 ` David Miller
2007-10-17 9:16 ` Jens Axboe
2007-10-17 9:24 ` FUJITA Tomonori
2007-10-17 9:27 ` Jens Axboe
2007-10-17 9:45 ` David Miller
2007-10-17 11:08 ` FUJITA Tomonori
2007-10-17 11:13 ` Jens Axboe
2007-10-17 11:16 ` Jens Axboe
2007-10-17 10:54 ` David Miller
2007-10-17 10:58 ` Jens Axboe
2007-10-17 11:01 ` Jens Axboe
2007-10-17 11:10 ` David Miller
2007-10-17 11:11 ` Jens Axboe
2007-10-17 11:18 ` David Miller
2007-10-17 11:27 ` Jens Axboe
2007-10-17 11:37 ` FUJITA Tomonori
2007-10-17 11:41 ` Jens Axboe
2007-10-17 11:57 ` FUJITA Tomonori
2007-10-17 12:05 ` FUJITA Tomonori
2007-10-17 14:36 ` Jens Axboe
2007-10-17 23:01 ` FUJITA Tomonori
2007-10-17 11:04 ` David Miller [this message]
2007-10-17 11:04 ` Jens Axboe
2007-10-17 11:04 ` FUJITA Tomonori
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