From: Venu Byravarasu <vbyravarasu@nvidia.com>
To: stern@rowland.harvard.edu, gregkh@linuxfoundation.org
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Venu Byravarasu <vbyravarasu@nvidia.com>
Subject: [PATCH] usb: host: tegra: code clean up
Date: Thu, 5 Apr 2012 11:25:30 +0530 [thread overview]
Message-ID: <1333605330-5629-1-git-send-email-vbyravarasu@nvidia.com> (raw)
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>
---
drivers/usb/host/ehci-tegra.c | 35 ++++++++++++++---------------------
1 files changed, 14 insertions(+), 21 deletions(-)
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 96c942c..65f4283 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -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 = {
--
1.7.1.1
next reply other threads:[~2012-04-05 5:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-05 5:55 Venu Byravarasu [this message]
2012-04-05 14:03 ` Alan Stern
2012-09-12 7:02 Venu Byravarasu
2012-09-12 13:51 ` Felipe Balbi
2012-09-12 18:11 ` Stephen Warren
2012-09-13 3:42 ` Venu Byravarasu
2012-09-13 4:50 ` Stephen Warren
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