usb-storage: update earlier scatter-gather bug fix
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>
diff --git a/drivers/usb/storage/protocol.c b/drivers/usb/storage/protocol.c
index 958f5b1..b9b8ede 100644
--- a/drivers/usb/storage/protocol.c
+++ b/drivers/usb/storage/protocol.c
@@ -170,7 +170,6 @@
if (!sg)
sg = scsi_sglist(srb);
- buflen = min(buflen, scsi_bufflen(srb));
/* This loop handles a single s-g list entry, which may
* include multiple pages. Find the initial page structure
@@ -232,6 +231,7 @@
unsigned int offset = 0;
struct scatterlist *sg = NULL;
+ buflen = min(buflen, scsi_bufflen(srb));
buflen = usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset,
TO_XFER_BUF);
if (buflen < scsi_bufflen(srb))