Change the type of the URB's 'sg' pointer from a usb_sg_request to
a scatterlist. This allows drivers to submit scatter-gather lists
without using the usb_sg_wait() interface. It has the added benefit
of removing the typecasts that were added as part of patch as1368 (and
slightly decreasing the number of pointer dereferences).
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Reviewed-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Tested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 3aaee28..f642127 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1278,7 +1278,7 @@ static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
if (urb->transfer_flags & URB_DMA_MAP_SG)
dma_unmap_sg(hcd->self.controller,
- urb->sg->sg,
+ urb->sg,
urb->num_sgs,
dir);
else if (urb->transfer_flags & URB_DMA_MAP_PAGE)
@@ -1347,7 +1347,7 @@ static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
if (urb->num_sgs) {
int n = dma_map_sg(
hcd->self.controller,
- urb->sg->sg,
+ urb->sg,
urb->num_sgs,
dir);
if (n <= 0)
@@ -1360,9 +1360,7 @@ static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
URB_DMA_SG_COMBINED;
}
} else if (urb->sg) {
- struct scatterlist *sg;
-
- sg = (struct scatterlist *) urb->sg;
+ struct scatterlist *sg = urb->sg;
urb->transfer_dma = dma_map_page(
hcd->self.controller,
sg_page(sg),
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index d8329eb..63919b8 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -413,7 +413,7 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
sg->length;
}
}
- io->urbs[0]->sg = io;
+ io->urbs[0]->sg = sg;
io->urbs[0]->num_sgs = io->entries;
io->entries = 1;
} else {
@@ -454,7 +454,7 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
}
io->urbs[i]->transfer_buffer_length = len;
- io->urbs[i]->sg = (struct usb_sg_request *) sg;
+ io->urbs[i]->sg = sg;
}
io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT;
}
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 8952177..11a79c4 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -663,7 +663,7 @@ qh_urb_transaction (
*/
i = urb->num_sgs;
if (len > 0 && i > 0) {
- sg = urb->sg->sg;
+ sg = urb->sg;
buf = sg_dma_address(sg);
/* urb->transfer_buffer_length may be smaller than the
diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c
index b388dd1..ab5a14f 100644
--- a/drivers/usb/host/whci/qset.c
+++ b/drivers/usb/host/whci/qset.c
@@ -443,7 +443,7 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u
remaining = urb->transfer_buffer_length;
- for_each_sg(urb->sg->sg, sg, urb->num_sgs, i) {
+ for_each_sg(urb->sg, sg, urb->num_sgs, i) {
dma_addr_t dma_addr;
size_t dma_remaining;
dma_addr_t sp, ep;
@@ -561,7 +561,7 @@ static int qset_add_urb_sg_linearize(struct whc *whc, struct whc_qset *qset,
remaining = urb->transfer_buffer_length;
- for_each_sg(urb->sg->sg, sg, urb->sg->nents, i) {
+ for_each_sg(urb->sg, sg, urb->num_sgs, i) {
size_t len;
size_t sg_remaining;
void *orig;
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 084b47f..1582d50 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1764,7 +1764,7 @@ static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb)
xhci_dbg(xhci, "count sg list trbs: \n");
num_trbs = 0;
- for_each_sg(urb->sg->sg, sg, num_sgs, i) {
+ for_each_sg(urb->sg, sg, num_sgs, i) {
unsigned int previous_total_trbs = num_trbs;
unsigned int len = sg_dma_len(sg);
@@ -1927,7 +1927,7 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
* the amount of memory allocated for this scatter-gather list.
* 3. TRBs buffers can't cross 64KB boundaries.
*/
- sg = urb->sg->sg;
+ sg = urb->sg;
addr = (u64) sg_dma_address(sg);
this_sg_len = sg_dma_len(sg);
trb_buff_len = TRB_MAX_BUFF_SIZE -
diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c
index 8a7968d..e7fa364 100644
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -422,7 +422,7 @@ static unsigned int mon_bin_get_data(const struct mon_reader_bin *rp,
}
/* Copy up to the first non-addressable segment */
- for_each_sg(urb->sg->sg, sg, urb->num_sgs, i) {
+ for_each_sg(urb->sg, sg, urb->num_sgs, i) {
if (length == 0 || PageHighMem(sg_page(sg)))
break;
this_len = min_t(unsigned int, sg->length, length);
diff --git a/drivers/usb/mon/mon_text.c b/drivers/usb/mon/mon_text.c
index d562602..a545d65 100644
--- a/drivers/usb/mon/mon_text.c
+++ b/drivers/usb/mon/mon_text.c
@@ -159,7 +159,7 @@ static inline char mon_text_get_data(struct mon_event_text *ep, struct urb *urb,
if (src == NULL)
return 'Z'; /* '0' would be not as pretty. */
} else {
- struct scatterlist *sg = urb->sg->sg;
+ struct scatterlist *sg = urb->sg;
if (PageHighMem(sg_page(sg)))
return 'D';
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 599ac15..eb217f4 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1214,7 +1214,7 @@ struct urb {
unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/
void *transfer_buffer; /* (in) associated data buffer */
dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */
- struct usb_sg_request *sg; /* (in) scatter gather buffer list */
+ struct scatterlist *sg; /* (in) scatter gather buffer list */
int num_sgs; /* (in) number of entries in the sg list */
u32 transfer_buffer_length; /* (in) data buffer length */
u32 actual_length; /* (return) actual transfer length */
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
