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authorMaulik Mankad <x0082077@ti.com>2010-09-24 06:44:06 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 13:21:53 -0400
commit496dda704bca1208e08773ba39b29a69536f5381 (patch)
tree9b6e445625b8c40b526bef271e29df77b1cd8761 /drivers/usb/core
parent6587cc0f30cd2f27cf0677e470f18792925a23a4 (diff)
usb: musb: host: unmap the buffer for PIO data transfers
The USB stack maps the buffer for DMA if the controller supports DMA. MUSB controller can perform DMA as well as PIO transfers. The buffer needs to be unmapped before CPU can perform PIO data transfers. Export unmap_urb_for_dma() so that drivers can perform the DMA unmapping in a sane way. Signed-off-by: Maulik Mankad <x0082077@ti.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/hcd.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 5cca00a6d09d..cb2d894321da 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1263,7 +1263,7 @@ static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
1263 *dma_handle = 0; 1263 *dma_handle = 0;
1264} 1264}
1265 1265
1266static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) 1266void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1267{ 1267{
1268 enum dma_data_direction dir; 1268 enum dma_data_direction dir;
1269 1269
@@ -1307,6 +1307,7 @@ static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1307 URB_DMA_MAP_SG | URB_DMA_MAP_PAGE | 1307 URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
1308 URB_DMA_MAP_SINGLE | URB_MAP_LOCAL); 1308 URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
1309} 1309}
1310EXPORT_SYMBOL_GPL(unmap_urb_for_dma);
1310 1311
1311static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, 1312static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1312 gfp_t mem_flags) 1313 gfp_t mem_flags)