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authorDavid Vrabel <david.vrabel@csr.com>2009-12-07 13:50:39 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 11:55:26 -0800
commit0d370755dd4ad3d119818579cfa3eb2e9978b3eb (patch)
treef8b7fa0640f156f4780f3c37a24e7af1f08729c2 /drivers/usb/host/whci
parentf3f6faa9edf67c1018270793e0547b0f81abb47e (diff)
USB: whci-hcd: correctly handle sg lists longer than QTD_MAX_XFER_SIZE.
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>
Diffstat (limited to 'drivers/usb/host/whci')
-rw-r--r--drivers/usb/host/whci/qset.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c
index 39e855a55c6..7d4204db0f6 100644
--- a/drivers/usb/host/whci/qset.c
+++ b/drivers/usb/host/whci/qset.c
@@ -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;