USB: introduce unmap_urb_setup_for_dma()

Split unmap_urb_for_dma() to allow just the setup buffer
to be unmapped. This allows HCDs to use PIO for the setup
buffer if it is not suitable for DMA.

Signed-off-by: Martin Fuzzey <mfuzzey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index cb2d894321da..61800f77dac8 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1263,10 +1263,8 @@ static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
         *dma_handle = 0;
 }
 
-void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
+void unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
 {
-        enum dma_data_direction dir;
-
         if (urb->transfer_flags & URB_SETUP_MAP_SINGLE)
                 dma_unmap_single(hcd->self.controller,
                                 urb->setup_dma,
@@ -1279,6 +1277,17 @@ void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
                                 sizeof(struct usb_ctrlrequest),
                                 DMA_TO_DEVICE);
 
+        /* Make it safe to call this routine more than once */
+        urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
+}
+EXPORT_SYMBOL_GPL(unmap_urb_setup_for_dma);
+
+void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
+{
+        enum dma_data_direction dir;
+
+        unmap_urb_setup_for_dma(hcd, 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,
@@ -1303,8 +1312,7 @@ void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
                                 dir);
 
         /* Make it safe to call this routine more than once */
-        urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL |
-                        URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
+        urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
                         URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
 }
 EXPORT_SYMBOL_GPL(unmap_urb_for_dma);