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USB: rename usb_buffer_alloc() and usb_buffer_free() 

For more clearance what the functions actually do,

  usb_buffer_alloc() is renamed to usb_alloc_coherent()
  usb_buffer_free()  is renamed to usb_free_coherent()

They should only be used in code which really needs DMA coherency.

[added compatibility macros so we can convert things easier - gregkh]

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Pedro Ribeiro <pedrib@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Daniel Mack 2010-04-12 13:17:25 +02:00 committed by Greg Kroah-Hartman
parent 75181f386f
commit 073900a28d
2 changed files with 25 additions and 13 deletions
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16
drivers/usb/core/usb.c
View File

@ -718,7 +718,7 @@ int __usb_get_extra_descriptor(char *buffer, unsigned size,
EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor);
/**
* usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
* usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
* @dev: device the buffer will be used with
* @size: requested buffer size
* @mem_flags: affect whether allocation may block
@ -737,29 +737,29 @@ EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor);
* architectures where CPU caches are not DMA-coherent. On systems without
* bus-snooping caches, these buffers are uncached.
*
* When the buffer is no longer used, free it with usb_buffer_free().
* When the buffer is no longer used, free it with usb_free_coherent().
*/
void *usb_buffer_alloc(struct usb_device *dev, size_t size, gfp_t mem_flags,
void *usb_alloc_coherent(struct usb_device *dev, size_t size, gfp_t mem_flags,
dma_addr_t *dma)
{
if (!dev || !dev->bus)
return NULL;
return hcd_buffer_alloc(dev->bus, size, mem_flags, dma);
}
EXPORT_SYMBOL_GPL(usb_buffer_alloc);
EXPORT_SYMBOL_GPL(usb_alloc_coherent);
/**
* usb_buffer_free - free memory allocated with usb_buffer_alloc()
* usb_free_coherent - free memory allocated with usb_alloc_coherent()
* @dev: device the buffer was used with
* @size: requested buffer size
* @addr: CPU address of buffer
* @dma: DMA address of buffer
*
* This reclaims an I/O buffer, letting it be reused. The memory must have
* been allocated using usb_buffer_alloc(), and the parameters must match
* been allocated using usb_alloc_coherent(), and the parameters must match
* those provided in that allocation request.
*/
void usb_buffer_free(struct usb_device *dev, size_t size, void *addr,
void usb_free_coherent(struct usb_device *dev, size_t size, void *addr,
dma_addr_t dma)
{
if (!dev || !dev->bus)
@ -768,7 +768,7 @@ void usb_buffer_free(struct usb_device *dev, size_t size, void *addr,
return;
hcd_buffer_free(dev->bus, size, addr, dma);
}
EXPORT_SYMBOL_GPL(usb_buffer_free);
EXPORT_SYMBOL_GPL(usb_free_coherent);
/**
* usb_buffer_map - create DMA mapping(s) for an urb

18
include/linux/usb.h
View File

@ -1085,7 +1085,7 @@ typedef void (*usb_complete_t)(struct urb *);
* Alternatively, drivers may pass the URB_NO_xxx_DMA_MAP transfer flags,
* which tell the host controller driver that no such mapping is needed since
* the device driver is DMA-aware. For example, a device driver might
* allocate a DMA buffer with usb_buffer_alloc() or call usb_buffer_map().
* allocate a DMA buffer with usb_alloc_coherent() or call usb_buffer_map().
* When these transfer flags are provided, host controller drivers will
* attempt to use the dma addresses found in the transfer_dma and/or
* setup_dma fields rather than determining a dma address themselves.
@ -1366,11 +1366,23 @@ static inline int usb_urb_dir_out(struct urb *urb)
return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_OUT;
}
void *usb_buffer_alloc(struct usb_device *dev, size_t size,
void *usb_alloc_coherent(struct usb_device *dev, size_t size,
gfp_t mem_flags, dma_addr_t *dma);
void usb_buffer_free(struct usb_device *dev, size_t size,
void usb_free_coherent(struct usb_device *dev, size_t size,
void *addr, dma_addr_t dma);
/* Compatible macros while we switch over */
static inline void *usb_buffer_alloc(struct usb_device *dev, size_t size,
gfp_t mem_flags, dma_addr_t *dma)
{
return usb_alloc_coherent(dev, size, mem_flags, dma);
}
static inline void usb_buffer_free(struct usb_device *dev, size_t size,
void *addr, dma_addr_t dma)
{
return usb_free_coherent(dev, size, addr, dma);
}
#if 0
struct urb *usb_buffer_map(struct urb *urb);
void usb_buffer_dmasync(struct urb *urb);