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authorAlan Stern <stern@rowland.harvard.edu>2010-03-05 15:10:17 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-20 13:21:31 -0700
commit0ede76fcec5415ef82a423a95120286895822e2d (patch)
tree61aa2a0b499a0101033c59b8884328bdb31e5956 /drivers/usb/storage/usb.c
parent749da5f82fe33ff68dd4aa1a5e35cd9aa6246dab (diff)
USB: remove uses of URB_NO_SETUP_DMA_MAP
This patch (as1350) removes all usages of coherent buffers for USB control-request setup-packet buffers. There's no good reason to reserve coherent memory for these things; control requests are hardly ever used in large quantity (the major exception is firmware transfers, and they aren't time-critical). Furthermore, only seven drivers used it. We might as well always use streaming DMA mappings for setup-packet buffers, and remove some extra complexity from usbcore. The DMA-mapping portion of hcd.c is currently in flux. A separate patch will be submitted to remove support for URB_NO_SETUP_DMA_MAP after everything else settles down. The removal should go smoothly, as by then nobody will be using it. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/storage/usb.c')
-rw-r--r--drivers/usb/storage/usb.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index bbeeb92a2131..c54a370c76c5 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -407,9 +407,8 @@ static int associate_dev(struct us_data *us, struct usb_interface *intf)
/* Store our private data in the interface */
usb_set_intfdata(intf, us);
- /* Allocate the device-related DMA-mapped buffers */
- us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
- GFP_KERNEL, &us->cr_dma);
+ /* Allocate the control/setup and DMA-mapped buffers */
+ us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL);
if (!us->cr) {
US_DEBUGP("usb_ctrlrequest allocation failed\n");
return -ENOMEM;
@@ -757,13 +756,9 @@ static void dissociate_dev(struct us_data *us)
{
US_DEBUGP("-- %s\n", __func__);
- /* Free the device-related DMA-mapped buffers */
- if (us->cr)
- usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,
- us->cr_dma);
- if (us->iobuf)
- usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf,
- us->iobuf_dma);
+ /* Free the buffers */
+ kfree(us->cr);
+ usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
/* Remove our private data from the interface */
usb_set_intfdata(us->pusb_intf, NULL);