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[PATCH] PATCH: usb-storage: allocate separate sense buffer

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This patch is from Alan Stern (as560).  It has been rediffed against a
current tree.

This patch allocates a separate buffer for usb-storage to use when
auto-sensing.  Up to now we have been using the sense buffer embedded in a
scsi_cmnd struct, which is dangerous on hosts that (a) don't do
cache-coherent DMA or (b) have DMA alignment restrictions.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2005-10-23 19:40:22 -07:00
committed by Greg Kroah-Hartman
parent b876aef7f8
commit bbafa4668f
3 changed files with 13 additions and 2 deletions
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5
drivers/usb/storage/transport.c
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@@ -636,11 +636,11 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
/* use the new buffer we have */
old_request_buffer = srb->request_buffer;
srb->request_buffer = srb->sense_buffer;
srb->request_buffer = us->sensebuf;
/* set the buffer length for transfer */
old_request_bufflen = srb->request_bufflen;
srb->request_bufflen = 18;
srb->request_bufflen = US_SENSE_SIZE;
/* set up for no scatter-gather use */
old_sg = srb->use_sg;
@@ -652,6 +652,7 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
temp_result = us->transport(us->srb, us);
/* let's clean up right away */
memcpy(srb->sense_buffer, us->sensebuf, US_SENSE_SIZE);
srb->resid = old_resid;
srb->request_buffer = old_request_buffer;
srb->request_bufflen = old_request_bufflen;