From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>, <rdreier@cisco.com>,
<linux-scsi@vger.kernel.org>, <rmk@arm.linux.org.uk>,
<davem@davemloft.net>, <james.bottomley@steeleye.com>,
<ralf@linux-mips.org>
Subject: Re: [PATCH 2/2] scsi: Use new __dma_buffer to align sense buffer in scsi_cmnd
Date: Fri, 21 Dec 2007 10:33:26 +0000 [thread overview]
Message-ID: <20071221103326.7ce1bc4f@the-village.bc.nu> (raw)
In-Reply-To: <20071221023011.4C4BADDDFA@ozlabs.org>
On Fri, 21 Dec 2007 13:30:08 +1100
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> The sense buffer ins scsi_cmnd can nowadays be DMA'ed into directly
> by some low level drivers (that typically happens with USB mass
> storage).
Should that not be fixed in USB storage by using pci_alloc_coherent on the
PCI device of the hub not peeing directly into kernel space ?
It's also incomplete as a fix because I don't see what guarantees the
buffer size will always exceed cache line size
Alan
next prev parent reply other threads:[~2007-12-21 10:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-21 2:30 [PATCH 2/2] scsi: Use new __dma_buffer to align sense buffer in scsi_cmnd Benjamin Herrenschmidt
2007-12-21 10:33 ` Alan Cox [this message]
2007-12-21 13:16 ` Matthew Wilcox
2007-12-21 13:30 ` Thomas Bogendoerfer
2007-12-21 14:00 ` Matthew Wilcox
2007-12-21 16:35 ` Thomas Bogendoerfer
2007-12-21 21:29 ` Benjamin Herrenschmidt
2007-12-21 16:57 ` Roland Dreier
2007-12-21 21:27 ` Benjamin Herrenschmidt
2007-12-23 11:09 ` Boaz Harrosh
2007-12-23 23:04 ` Benjamin Herrenschmidt
2008-01-07 6:53 ` FUJITA Tomonori
2008-01-07 13:25 ` Boaz Harrosh
2008-01-07 23:32 ` FUJITA Tomonori
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