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author | Alan Stern <stern@rowland.harvard.edu> | 2008-11-21 11:46:17 -0500 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-01-07 09:59:57 -0800 |
commit | 96983d2d861bf94b7f70bc47ac3c5b289f519a2d (patch) | |
tree | 562c8f19df7dcf8bd2ad9a399e09fae71fcd8046 /drivers/usb/core/usb.c | |
parent | 3dae5345311271fe598a61bd01f563fc835b4217 (diff) | |
download | op-kernel-dev-96983d2d861bf94b7f70bc47ac3c5b289f519a2d.zip op-kernel-dev-96983d2d861bf94b7f70bc47ac3c5b289f519a2d.tar.gz |
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>
Diffstat (limited to 'drivers/usb/core/usb.c')
0 files changed, 0 insertions, 0 deletions