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usb: host: tegra: code clean up 

With this patch:
	1. Renamed structure and function names to be more meaningful.
	2. Removed unnecessary local variables.

Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Venu Byravarasu 2012-04-05 11:25:30 +05:30 committed by Greg Kroah-Hartman
parent 259b83a387
commit fe375774bd
1 changed files with 14 additions and 21 deletions
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35
drivers/usb/host/ehci-tegra.c
View File

@ -462,26 +462,23 @@ static int tegra_ehci_bus_resume(struct usb_hcd *hcd)
}
#endif
struct temp_buffer {
struct dma_aligned_buffer {
void *kmalloc_ptr;
void *old_xfer_buffer;
u8 data[0];
};
static void free_temp_buffer(struct urb *urb)
static void free_dma_aligned_buffer(struct urb *urb)
{
enum dma_data_direction dir;
struct temp_buffer *temp;
struct dma_aligned_buffer *temp;
if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
return;
dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
temp = container_of(urb->transfer_buffer,
struct dma_aligned_buffer, data);
temp = container_of(urb->transfer_buffer, struct temp_buffer,
data);
if (dir == DMA_FROM_DEVICE)
if (usb_urb_dir_in(urb))
memcpy(temp->old_xfer_buffer, temp->data,
urb->transfer_buffer_length);
urb->transfer_buffer = temp->old_xfer_buffer;
@ -490,10 +487,9 @@ static void free_temp_buffer(struct urb *urb)
urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
}
static int alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
static int alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
{
enum dma_data_direction dir;
struct temp_buffer *temp, *kmalloc_ptr;
struct dma_aligned_buffer *temp, *kmalloc_ptr;
size_t kmalloc_size;
if (urb->num_sgs || urb->sg ||
@ -501,22 +497,19 @@ static int alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
!((uintptr_t)urb->transfer_buffer & (TEGRA_USB_DMA_ALIGN - 1)))
return 0;
dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
/* Allocate a buffer with enough padding for alignment */
kmalloc_size = urb->transfer_buffer_length +
sizeof(struct temp_buffer) + TEGRA_USB_DMA_ALIGN - 1;
sizeof(struct dma_aligned_buffer) + TEGRA_USB_DMA_ALIGN - 1;
kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
if (!kmalloc_ptr)
return -ENOMEM;
/* Position our struct temp_buffer such that data is aligned */
/* Position our struct dma_aligned_buffer such that data is aligned */
temp = PTR_ALIGN(kmalloc_ptr + 1, TEGRA_USB_DMA_ALIGN) - 1;
temp->kmalloc_ptr = kmalloc_ptr;
temp->old_xfer_buffer = urb->transfer_buffer;
if (dir == DMA_TO_DEVICE)
if (usb_urb_dir_out(urb))
memcpy(temp->data, urb->transfer_buffer,
urb->transfer_buffer_length);
urb->transfer_buffer = temp->data;
@ -531,13 +524,13 @@ static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
{
int ret;
ret = alloc_temp_buffer(urb, mem_flags);
ret = alloc_dma_aligned_buffer(urb, mem_flags);
if (ret)
return ret;
ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
if (ret)
free_temp_buffer(urb);
free_dma_aligned_buffer(urb);
return ret;
}
@ -545,7 +538,7 @@ static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
usb_hcd_unmap_urb_for_dma(hcd, urb);
free_temp_buffer(urb);
free_dma_aligned_buffer(urb);
}
static const struct hc_driver tegra_ehci_hc_driver = {