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authorJussi Kivilinna <jussi.kivilinna@mbnet.fi>2011-01-31 20:49:24 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-02-04 16:29:50 -0500
commit4a3b0874a481573bfd95d54c883248b4c4622572 (patch)
treefdd649fdccfe27dfb4f861fdebb4b5dad34b2cf8 /drivers
parentzd1211rw: use stack and preallocated memory for small cmd-buffers (diff)
downloadlinux-dev-4a3b0874a481573bfd95d54c883248b4c4622572.tar.xz
linux-dev-4a3b0874a481573bfd95d54c883248b4c4622572.zip
zd1211rw: change interrupt URB buffer to DMA buffer
As might lower beacon update CPU usage. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/zd1211rw/zd_usb.c36
-rw-r--r--drivers/net/wireless/zd1211rw/zd_usb.h2
2 files changed, 25 insertions, 13 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c
index bf1de04dc9f2..ccdf81ebc4f5 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -411,7 +411,7 @@ static void int_urb_complete(struct urb *urb)
case -ENOENT:
case -ECONNRESET:
case -EPIPE:
- goto kfree;
+ return;
default:
goto resubmit;
}
@@ -443,12 +443,11 @@ static void int_urb_complete(struct urb *urb)
resubmit:
r = usb_submit_urb(urb, GFP_ATOMIC);
if (r) {
- dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
- goto kfree;
+ dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n",
+ urb, r);
+ /* TODO: add worker to reset intr->urb */
}
return;
-kfree:
- kfree(urb->transfer_buffer);
}
static inline int int_urb_interval(struct usb_device *udev)
@@ -479,9 +478,8 @@ static inline int usb_int_enabled(struct zd_usb *usb)
int zd_usb_enable_int(struct zd_usb *usb)
{
int r;
- struct usb_device *udev;
+ struct usb_device *udev = zd_usb_to_usbdev(usb);
struct zd_usb_interrupt *intr = &usb->intr;
- void *transfer_buffer = NULL;
struct urb *urb;
dev_dbg_f(zd_usb_dev(usb), "\n");
@@ -502,20 +500,21 @@ int zd_usb_enable_int(struct zd_usb *usb)
intr->urb = urb;
spin_unlock_irq(&intr->lock);
- /* TODO: make it a DMA buffer */
r = -ENOMEM;
- transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
- if (!transfer_buffer) {
+ intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER,
+ GFP_KERNEL, &intr->buffer_dma);
+ if (!intr->buffer) {
dev_dbg_f(zd_usb_dev(usb),
"couldn't allocate transfer_buffer\n");
goto error_set_urb_null;
}
- udev = zd_usb_to_usbdev(usb);
usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
- transfer_buffer, USB_MAX_EP_INT_BUFFER,
+ intr->buffer, USB_MAX_EP_INT_BUFFER,
int_urb_complete, usb,
intr->interval);
+ urb->transfer_dma = intr->buffer_dma;
+ urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
r = usb_submit_urb(urb, GFP_KERNEL);
@@ -527,7 +526,8 @@ int zd_usb_enable_int(struct zd_usb *usb)
return 0;
error:
- kfree(transfer_buffer);
+ usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
+ intr->buffer, intr->buffer_dma);
error_set_urb_null:
spin_lock_irq(&intr->lock);
intr->urb = NULL;
@@ -541,8 +541,11 @@ out:
void zd_usb_disable_int(struct zd_usb *usb)
{
unsigned long flags;
+ struct usb_device *udev = zd_usb_to_usbdev(usb);
struct zd_usb_interrupt *intr = &usb->intr;
struct urb *urb;
+ void *buffer;
+ dma_addr_t buffer_dma;
spin_lock_irqsave(&intr->lock, flags);
urb = intr->urb;
@@ -551,11 +554,18 @@ void zd_usb_disable_int(struct zd_usb *usb)
return;
}
intr->urb = NULL;
+ buffer = intr->buffer;
+ buffer_dma = intr->buffer_dma;
+ intr->buffer = NULL;
spin_unlock_irqrestore(&intr->lock, flags);
usb_kill_urb(urb);
dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
usb_free_urb(urb);
+
+ if (buffer)
+ usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
+ buffer, buffer_dma);
}
static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.h b/drivers/net/wireless/zd1211rw/zd_usb.h
index 2ed48ae3e604..24db0dd68421 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.h
+++ b/drivers/net/wireless/zd1211rw/zd_usb.h
@@ -162,6 +162,8 @@ struct zd_usb_interrupt {
struct read_regs_int read_regs;
spinlock_t lock;
struct urb *urb;
+ void *buffer;
+ dma_addr_t buffer_dma;
int interval;
u8 read_regs_enabled:1;
};