[PATCH] drivers: drop unused usb_gadget_{map,unmap}_request()

[PATCH] drivers: drop unused usb_gadget_{map,unmap}_request()

[Antony Pavlov]

There is no code that is dependent on
usb_gadget_{map,unmap}_request().

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 drivers/usb/gadget/udc-core.c | 55 -----------------------------------
 include/usb/gadget.h          | 10 -------
 2 files changed, 65 deletions(-)

diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c
index 2516676f86..bd3404f9cf 100644
--- a/drivers/usb/gadget/udc-core.c
+++ b/drivers/usb/gadget/udc-core.c
@@ -46,61 +46,6 @@ static LIST_HEAD(udc_list);
 
 /* ------------------------------------------------------------------------- */
 
-#ifdef	CONFIG_KERNEL_HAS_DMA
-
-int usb_gadget_map_request(struct usb_gadget *gadget,
-		struct usb_request *req, int is_in)
-{
-	if (req->length == 0)
-		return 0;
-
-	if (req->num_sgs) {
-		int     mapped;
-
-		mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs,
-				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-		if (mapped == 0) {
-			dev_err(&gadget->dev, "failed to map SGs\n");
-			return -EFAULT;
-		}
-
-		req->num_mapped_sgs = mapped;
-	} else {
-		req->dma = dma_map_single(&gadget->dev, req->buf, req->length,
-				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-
-		if (dma_mapping_error(&gadget->dev, req->dma)) {
-			dev_err(&gadget->dev, "failed to map buffer\n");
-			return -EFAULT;
-		}
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(usb_gadget_map_request);
-
-void usb_gadget_unmap_request(struct usb_gadget *gadget,
-		struct usb_request *req, int is_in)
-{
-	if (req->length == 0)
-		return;
-
-	if (req->num_mapped_sgs) {
-		dma_unmap_sg(&gadget->dev, req->sg, req->num_mapped_sgs,
-				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-
-		req->num_mapped_sgs = 0;
-	} else {
-		dma_unmap_single(&gadget->dev, req->dma, req->length,
-				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-	}
-}
-EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
-
-#endif	/* CONFIG_HAS_DMA */
-
-/* ------------------------------------------------------------------------- */
-
 void usb_gadget_set_state(struct usb_gadget *gadget,
 		enum usb_device_state state)
 {
diff --git a/include/usb/gadget.h b/include/usb/gadget.h
index 3e1d7153dc..431f316c46 100644
--- a/include/usb/gadget.h
+++ b/include/usb/gadget.h
@@ -1002,16 +1002,6 @@ void usb_free_all_descriptors(struct usb_function *f);
 
 /*-------------------------------------------------------------------------*/
 
-/* utility to simplify map/unmap of usb_requests to/from DMA */
-
-extern int usb_gadget_map_request(struct usb_gadget *gadget,
-		struct usb_request *req, int is_in);
-
-extern void usb_gadget_unmap_request(struct usb_gadget *gadget,
-		struct usb_request *req, int is_in);
-
-/*-------------------------------------------------------------------------*/
-
 /* utility to set gadget state properly */
 
 extern void usb_gadget_set_state(struct usb_gadget *gadget,
-- 
2.32.0.rc0


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Re: [PATCH] drivers: drop unused usb_gadget_{map,unmap}_request()

[Sascha Hauer]

On Mon, Jun 14, 2021 at 05:28:33PM +0300, Antony Pavlov wrote:
> There is no code that is dependent on
> usb_gadget_{map,unmap}_request().

My first reaction was: But maybe there *should* be code depending on
that, but

> -#ifdef	CONFIG_KERNEL_HAS_DMA
> -
> -int usb_gadget_map_request(struct usb_gadget *gadget,
> -		struct usb_request *req, int is_in)
> -{
> -	if (req->length == 0)
> -		return 0;
> -
> -	if (req->num_sgs) {
> -		int     mapped;
> -
> -		mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs,
> -				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);

Trying to use it would at least fail when trying to link this. We don't
have any implementation for dma_map_sg().

So ok to remove this nonfunctional code.

Sascha

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