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USB: Change the scatterlist type in struct urb 

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@linux.intel.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthew Wilcox 2010-05-01 12:20:01 -06:00 committed by Greg Kroah-Hartman
parent 1e429018b6
commit 910f8d0ced
8 changed files with 13 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/usb/core/hcd.c
View File

@ -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)
@ -1346,7 +1346,7 @@ 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)
@ -1359,9 +1359,7 @@ 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),

4
drivers/usb/core/message.c
View File

@ -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;
}

2
drivers/usb/host/ehci-q.c
View File

@ -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

4
drivers/usb/host/whci/qset.c
View File

@ -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;

4
drivers/usb/host/xhci-ring.c
View File

@ -1788,7 +1788,7 @@ 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);
@ -1951,7 +1951,7 @@ 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 -

2
drivers/usb/mon/mon_bin.c
View File

@ -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);

2
drivers/usb/mon/mon_text.c
View File

@ -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';

2
include/linux/usb.h
View File

@ -1195,7 +1195,7 @@ 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 */