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usb-storage: update earlier scatter-gather bug fix

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This patch (as1037) makes a small update to the earlier as1035 patch.
The minimum-length computation shouldn't be done in
usb_stor_access_xfer_buf(), since that routine can be called multiple
times for a single transfer.  It should be done in
usb_stor_set_xfer_buf() instead, which gets called only once.

The way it is now isn't really _wrong_, but it isn't really _right_
either.  Moving the statement will be an improvement.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2008-02-22 17:00:06 -05:00 committed by Greg Kroah-Hartman
parent 0ed930bffa
commit 6d512a80c2
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/storage/protocol.c
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@ -170,7 +170,6 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
if (!sg) if (!sg)
sg = scsi_sglist(srb); sg = scsi_sglist(srb);
buflen = min(buflen, scsi_bufflen(srb));
/* This loop handles a single s-g list entry, which may /* This loop handles a single s-g list entry, which may
* include multiple pages. Find the initial page structure * include multiple pages. Find the initial page structure
@ -232,6 +231,7 @@ void usb_stor_set_xfer_buf(unsigned char *buffer,
unsigned int offset = 0; unsigned int offset = 0;
struct scatterlist *sg = NULL; struct scatterlist *sg = NULL;
buflen = min(buflen, scsi_bufflen(srb));
buflen = usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset, buflen = usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset,
TO_XFER_BUF); TO_XFER_BUF);
if (buflen < scsi_bufflen(srb)) if (buflen < scsi_bufflen(srb))