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USB: use standard SG iterator in the scatter-gather library

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This patch (as1103) changes the iteration in the USB scatter-gather to
use a standard SG iterator.  Otherwise the iteration will fail if it
encounters a chained SG list.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2008-06-16 12:11:39 -04:00 committed by Greg Kroah-Hartman
parent 625f694936
commit 7c3e28bc56
1 changed files with 6 additions and 6 deletions
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12
drivers/usb/core/message.c
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@ -400,7 +400,7 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
if (usb_pipein(pipe))
urb_flags |= URB_SHORT_NOT_OK;
for (i = 0; i < io->entries; i++) {
for_each_sg(sg, sg, io->entries, i) {
unsigned len;
io->urbs[i] = usb_alloc_urb(0, mem_flags);
@ -434,17 +434,17 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
* to prevent stale pointers and to help spot bugs.
*/
if (dma) {
io->urbs[i]->transfer_dma = sg_dma_address(sg + i);
len = sg_dma_len(sg + i);
io->urbs[i]->transfer_dma = sg_dma_address(sg);
len = sg_dma_len(sg);
#if defined(CONFIG_HIGHMEM) || defined(CONFIG_GART_IOMMU)
io->urbs[i]->transfer_buffer = NULL;
#else
io->urbs[i]->transfer_buffer = sg_virt(&sg[i]);
io->urbs[i]->transfer_buffer = sg_virt(sg);
#endif
} else {
/* hc may use _only_ transfer_buffer */
io->urbs[i]->transfer_buffer = sg_virt(&sg[i]);
len = sg[i].length;
io->urbs[i]->transfer_buffer = sg_virt(sg);
len = sg->length;
}
if (length) {