From: Alan Stern <stern@rowland.harvard.edu>
Date: Fri, 21 Nov 2008 16:46:17 +0000 (-0500)
Subject: USB: storage: set bounce limit for non-DMA-capable host controllers
X-Git-Tag: v2.6.29-rc1~182^2~84
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96983d2d861bf94b7f70bc47ac3c5b289f519a2d;p=pandora-kernel.git

USB: storage: set bounce limit for non-DMA-capable host controllers

This patch (as1175) makes usb-storage set a SCSI device's
request-queue bounce limit such that all buffers will be located in
addressable memory (i.e., not in high memory) if the host controller's
dma_mask is NULL.  This is necessary when the host controller doesn't
support DMA: If a buffer is in high memory then the both the virtual
and DMA addresses produced by the scatter-gather library will be NULL,
preventing the HCD from accessing the buffer's data.

In particular, the isp1760 driver needs this when used on a system
with more than 1 GB of memory.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Tested-by: Thomas Hommel <Thomas.Hommel@gefanuc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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