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authorDavid Brownell <david-b@pacbell.net>2007-07-01 21:21:00 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-13 01:34:42 +0200
commitc67ab134ba9f83f9de86e58adfeaa14a9efa6e00 (patch)
treedf9022b4a38e955abbf254d71e00ac1fecce6420 /drivers/usb/gadget/goku_udc.c
parentusb gadget stack: remove usb_ep_*_buffer(), part 1 (diff)
downloadlinux-c67ab134ba9f83f9de86e58adfeaa14a9efa6e00.tar.xz
linux-c67ab134ba9f83f9de86e58adfeaa14a9efa6e00.zip
usb gadget stack: remove usb_ep_*_buffer(), part 2
This patch removes controller driver infrastructure which supported the now-removed usb_ep_{alloc,free}_buffer() calls. As can be seen, many of the implementations of this were broken to various degrees. Many didn't properly return dma-coherent mappings; those which did so were necessarily ugly because of bogosity in the underlying dma_free_coherent() calls ... which on many platforms can't be called from the same contexts (notably in_irq) from which their dma_alloc_coherent() sibling can be called. The main potential downside of removing this is that gadget drivers wouldn't have specific knowledge that the controller drivers have: endpoints that aren't dma-capable don't need any dma mappings at all. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/goku_udc.c')
-rw-r--r--drivers/usb/gadget/goku_udc.c48
1 files changed, 0 insertions, 48 deletions
diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index ae931af05cef..dfadb643597b 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -296,51 +296,6 @@ goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
/*-------------------------------------------------------------------------*/
-/* allocating buffers this way eliminates dma mapping overhead, which
- * on some platforms will mean eliminating a per-io buffer copy. with
- * some kinds of system caches, further tweaks may still be needed.
- */
-static void *
-goku_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
- dma_addr_t *dma, gfp_t gfp_flags)
-{
- void *retval;
- struct goku_ep *ep;
-
- ep = container_of(_ep, struct goku_ep, ep);
- if (!_ep)
- return NULL;
- *dma = DMA_ADDR_INVALID;
-
- if (ep->dma) {
- /* the main problem with this call is that it wastes memory
- * on typical 1/N page allocations: it allocates 1-N pages.
- */
-#warning Using dma_alloc_coherent even with buffers smaller than a page.
- retval = dma_alloc_coherent(&ep->dev->pdev->dev,
- bytes, dma, gfp_flags);
- } else
- retval = kmalloc(bytes, gfp_flags);
- return retval;
-}
-
-static void
-goku_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma, unsigned bytes)
-{
- /* free memory into the right allocator */
- if (dma != DMA_ADDR_INVALID) {
- struct goku_ep *ep;
-
- ep = container_of(_ep, struct goku_ep, ep);
- if (!_ep)
- return;
- dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
- } else
- kfree (buf);
-}
-
-/*-------------------------------------------------------------------------*/
-
static void
done(struct goku_ep *ep, struct goku_request *req, int status)
{
@@ -1026,9 +981,6 @@ static struct usb_ep_ops goku_ep_ops = {
.alloc_request = goku_alloc_request,
.free_request = goku_free_request,
- .alloc_buffer = goku_alloc_buffer,
- .free_buffer = goku_free_buffer,
-
.queue = goku_queue,
.dequeue = goku_dequeue,