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USB: whci-hcd: correctly handle sg lists longer than QTD_MAX_XFER_SIZE.

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When building qTDs (sTDs) from a scatter-gather list, the length of the
qTD must be a multiple of wMaxPacketSize if the transfer continues into
another qTD.

This also fixes a link failure on configurations for 32 bit processors
with 64 bit dma_addr_t (e.g., CONFIG_HIGHMEM_64G).

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Vrabel 2009-12-07 13:50:39 +00:00 committed by Greg Kroah-Hartman
parent f3f6faa9ed
commit 0d370755dd
1 changed files with 11 additions and 11 deletions
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22
drivers/usb/host/whci/qset.c
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@ -465,16 +465,16 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u
* - the previous one isn't full.
*
* If a new std is needed but the previous one
* did not end on a wMaxPacketSize boundary
* then this sg list cannot be mapped onto
* multiple qTDs. Return an error and let the
* caller sort it out.
* was not a whole number of packets then this
* sg list cannot be mapped onto multiple
* qTDs. Return an error and let the caller
* sort it out.
*/
if (!std
|| (prev_end & (WHCI_PAGE_SIZE-1))
|| (dma_addr & (WHCI_PAGE_SIZE-1))
|| std->len + WHCI_PAGE_SIZE > QTD_MAX_XFER_SIZE) {
if (prev_end % qset->max_packet != 0)
if (std->len % qset->max_packet != 0)
return -EINVAL;
std = qset_new_std(whc, qset, urb, mem_flags);
if (std == NULL) {
@ -487,14 +487,14 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u
dma_len = dma_remaining;
/*
* If the remainder in this element doesn't
* fit in a single qTD, end the qTD on a
* wMaxPacketSize boundary.
* If the remainder of this element doesn't
* fit in a single qTD, limit the qTD to a
* whole number of packets. This allows the
* remainder to go into the next qTD.
*/
if (std->len + dma_len > QTD_MAX_XFER_SIZE) {
dma_len = QTD_MAX_XFER_SIZE - std->len;
ep = ((dma_addr + dma_len) / qset->max_packet) * qset->max_packet;
dma_len = ep - dma_addr;
dma_len = (QTD_MAX_XFER_SIZE / qset->max_packet)
* qset->max_packet - std->len;
}
std->len += dma_len;