* [PATCH 1/4] zd1211rw: correct use of usb_bulk_msg on interrupt endpoints
2011-02-12 18:43 [PATCH 0/4] Fix high CPU usage in AP-mode Jussi Kivilinna
@ 2011-02-12 18:43 ` Jussi Kivilinna
2011-02-12 18:43 ` [PATCH 2/4] zd1211rw: use async urb for write command Jussi Kivilinna
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Jussi Kivilinna @ 2011-02-12 18:43 UTC (permalink / raw)
To: linux-wireless; +Cc: Daniel Drake, John W. Linville, Ulrich Kunitz
zd1211rw is using usb_bulk_msg() with usb_sndbulkpipe() on interrupt endpoint.
However usb_bulk_msg() internally corrects this and makes interrupt URB.
It's better to change usb_bulk_msgs in zd1211rw to usb_interrupt_msg for less
confusion.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
---
drivers/net/wireless/zd1211rw/zd_usb.c | 24 ++++++++++++------------
1 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c
index f6df366..7346512 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -1634,15 +1634,15 @@ int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
udev = zd_usb_to_usbdev(usb);
prepare_read_regs_int(usb);
- r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
- req, req_len, &actual_req_len, 50 /* ms */);
+ r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
+ req, req_len, &actual_req_len, 50 /* ms */);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
- "error in usb_bulk_msg(). Error number %d\n", r);
+ "error in usb_interrupt_msg(). Error number %d\n", r);
goto error;
}
if (req_len != actual_req_len) {
- dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
+ dev_dbg_f(zd_usb_dev(usb), "error in usb_interrupt_msg()\n"
" req_len %d != actual_req_len %d\n",
req_len, actual_req_len);
r = -EIO;
@@ -1705,16 +1705,16 @@ int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
}
udev = zd_usb_to_usbdev(usb);
- r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
- req, req_len, &actual_req_len, 50 /* ms */);
+ r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
+ req, req_len, &actual_req_len, 50 /* ms */);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
- "error in usb_bulk_msg(). Error number %d\n", r);
+ "error in usb_interrupt_msg(). Error number %d\n", r);
goto error;
}
if (req_len != actual_req_len) {
dev_dbg_f(zd_usb_dev(usb),
- "error in usb_bulk_msg()"
+ "error in usb_interrupt_msg()"
" req_len %d != actual_req_len %d\n",
req_len, actual_req_len);
r = -EIO;
@@ -1794,15 +1794,15 @@ int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
}
udev = zd_usb_to_usbdev(usb);
- r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
- req, req_len, &actual_req_len, 50 /* ms */);
+ r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
+ req, req_len, &actual_req_len, 50 /* ms */);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
- "error in usb_bulk_msg(). Error number %d\n", r);
+ "error in usb_interrupt_msg(). Error number %d\n", r);
goto out;
}
if (req_len != actual_req_len) {
- dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
+ dev_dbg_f(zd_usb_dev(usb), "error in usb_interrupt_msg()"
" req_len %d != actual_req_len %d\n",
req_len, actual_req_len);
r = -EIO;
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 2/4] zd1211rw: use async urb for write command
2011-02-12 18:43 [PATCH 0/4] Fix high CPU usage in AP-mode Jussi Kivilinna
2011-02-12 18:43 ` [PATCH 1/4] zd1211rw: correct use of usb_bulk_msg on interrupt endpoints Jussi Kivilinna
@ 2011-02-12 18:43 ` Jussi Kivilinna
2011-02-12 18:43 ` [PATCH 3/4] zd1211rw: move async iowrite16v up to callers Jussi Kivilinna
2011-02-12 18:43 ` [PATCH 4/4] zd1211rw: add unlikely to ZD_ASSERT Jussi Kivilinna
3 siblings, 0 replies; 6+ messages in thread
From: Jussi Kivilinna @ 2011-02-12 18:43 UTC (permalink / raw)
To: linux-wireless; +Cc: Daniel Drake, John W. Linville, Ulrich Kunitz
Writing beacon to device happen through multiple write command calls.
zd_usb_iowrite16v uses synchronous urb call and with multiple write
commands in row causes high CPU usage.
This patch makes zd_usb_iowrite16v use asynchronous urb submit within
zd_usb.c. zd_usb_iowrite16v_async_start is used to initiate writing
multiple commands to device using zd_usb_iowrite16v_async. Each URB
is delayed and submitted to device by next zd_usb_iowrite16v_async
call or by call to zd_usb_iowrite16v_async_end. URBs submitted by
zd_usb_iowrite16v_async have URB_NO_INTERRUPT set and last URB
send by zd_usb_iowrite16v_async_end does not. This lower CPU
usage when doing writes that require multiple URBs.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
---
drivers/net/wireless/zd1211rw/zd_usb.c | 162 +++++++++++++++++++++++++++-----
drivers/net/wireless/zd1211rw/zd_usb.h | 5 +
2 files changed, 142 insertions(+), 25 deletions(-)
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c
index 7346512..c98f6e7 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -1156,6 +1156,7 @@ void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
memset(usb, 0, sizeof(*usb));
usb->intf = usb_get_intf(intf);
usb_set_intfdata(usb->intf, hw);
+ init_usb_anchor(&usb->submitted_cmds);
init_usb_interrupt(usb);
init_usb_tx(usb);
init_usb_rx(usb);
@@ -1663,13 +1664,104 @@ error:
return r;
}
-int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
- unsigned int count)
+static void iowrite16v_urb_complete(struct urb *urb)
+{
+ struct zd_usb *usb = urb->context;
+
+ if (urb->status && !usb->cmd_error)
+ usb->cmd_error = urb->status;
+}
+
+static int zd_submit_waiting_urb(struct zd_usb *usb, bool last)
+{
+ int r;
+ struct urb *urb = usb->urb_async_waiting;
+
+ if (!urb)
+ return 0;
+
+ usb->urb_async_waiting = NULL;
+
+ if (!last)
+ urb->transfer_flags |= URB_NO_INTERRUPT;
+
+ usb_anchor_urb(urb, &usb->submitted_cmds);
+ r = usb_submit_urb(urb, GFP_KERNEL);
+ if (r) {
+ usb_unanchor_urb(urb);
+ dev_dbg_f(zd_usb_dev(usb),
+ "error in usb_submit_urb(). Error number %d\n", r);
+ goto error;
+ }
+
+ /* fall-through with r == 0 */
+error:
+ usb_free_urb(urb);
+ return r;
+}
+
+static void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
+{
+ ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds));
+ ZD_ASSERT(usb->urb_async_waiting == NULL);
+ ZD_ASSERT(!usb->in_async);
+
+ ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
+
+ usb->in_async = 1;
+ usb->cmd_error = 0;
+ usb->urb_async_waiting = NULL;
+}
+
+static int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout)
+{
+ int r;
+
+ ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
+ ZD_ASSERT(usb->in_async);
+
+ /* Submit last iowrite16v URB */
+ r = zd_submit_waiting_urb(usb, true);
+ if (r) {
+ dev_dbg_f(zd_usb_dev(usb),
+ "error in zd_submit_waiting_usb(). "
+ "Error number %d\n", r);
+
+ usb_kill_anchored_urbs(&usb->submitted_cmds);
+ goto error;
+ }
+
+ if (timeout)
+ timeout = usb_wait_anchor_empty_timeout(&usb->submitted_cmds,
+ timeout);
+ if (!timeout) {
+ usb_kill_anchored_urbs(&usb->submitted_cmds);
+ if (usb->cmd_error == -ENOENT) {
+ dev_dbg_f(zd_usb_dev(usb), "timed out");
+ r = -ETIMEDOUT;
+ goto error;
+ }
+ }
+
+ r = usb->cmd_error;
+error:
+ usb->in_async = 0;
+ return r;
+}
+
+static int zd_usb_iowrite16v_async(struct zd_usb *usb,
+ const struct zd_ioreq16 *ioreqs,
+ unsigned int count)
{
int r;
struct usb_device *udev;
struct usb_req_write_regs *req = NULL;
- int i, req_len, actual_req_len;
+ int i, req_len;
+ struct urb *urb;
+ struct usb_host_endpoint *ep;
+
+ ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
+ ZD_ASSERT(usb->in_async);
if (count == 0)
return 0;
@@ -1685,17 +1777,23 @@ int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
return -EWOULDBLOCK;
}
- ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
- BUILD_BUG_ON(sizeof(struct usb_req_write_regs) +
- USB_MAX_IOWRITE16_COUNT * sizeof(struct reg_data) >
- sizeof(usb->req_buf));
- BUG_ON(sizeof(struct usb_req_write_regs) +
- count * sizeof(struct reg_data) >
- sizeof(usb->req_buf));
+ udev = zd_usb_to_usbdev(usb);
+
+ ep = usb_pipe_endpoint(udev, usb_sndintpipe(udev, EP_REGS_OUT));
+ if (!ep)
+ return -ENOENT;
+
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!urb)
+ return -ENOMEM;
req_len = sizeof(struct usb_req_write_regs) +
count * sizeof(struct reg_data);
- req = (void *)usb->req_buf;
+ req = kmalloc(req_len, GFP_KERNEL);
+ if (!req) {
+ r = -ENOMEM;
+ goto error;
+ }
req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
for (i = 0; i < count; i++) {
@@ -1704,28 +1802,44 @@ int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
rw->value = cpu_to_le16(ioreqs[i].value);
}
- udev = zd_usb_to_usbdev(usb);
- r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
- req, req_len, &actual_req_len, 50 /* ms */);
+ usb_fill_int_urb(urb, udev, usb_sndintpipe(udev, EP_REGS_OUT),
+ req, req_len, iowrite16v_urb_complete, usb,
+ ep->desc.bInterval);
+ urb->transfer_flags |= URB_FREE_BUFFER | URB_SHORT_NOT_OK;
+
+ /* Submit previous URB */
+ r = zd_submit_waiting_urb(usb, false);
if (r) {
dev_dbg_f(zd_usb_dev(usb),
- "error in usb_interrupt_msg(). Error number %d\n", r);
- goto error;
- }
- if (req_len != actual_req_len) {
- dev_dbg_f(zd_usb_dev(usb),
- "error in usb_interrupt_msg()"
- " req_len %d != actual_req_len %d\n",
- req_len, actual_req_len);
- r = -EIO;
+ "error in zd_submit_waiting_usb(). "
+ "Error number %d\n", r);
goto error;
}
- /* FALL-THROUGH with r == 0 */
+ /* Delay submit so that URB_NO_INTERRUPT flag can be set for all URBs
+ * of currect batch except for very last.
+ */
+ usb->urb_async_waiting = urb;
+ return 0;
error:
+ usb_free_urb(urb);
return r;
}
+int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
+ unsigned int count)
+{
+ int r;
+
+ zd_usb_iowrite16v_async_start(usb);
+ r = zd_usb_iowrite16v_async(usb, ioreqs, count);
+ if (r) {
+ zd_usb_iowrite16v_async_end(usb, 0);
+ return r;
+ }
+ return zd_usb_iowrite16v_async_end(usb, 50 /* ms */);
+}
+
int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
{
int r;
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.h b/drivers/net/wireless/zd1211rw/zd_usb.h
index 2d688f4..9291426 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.h
+++ b/drivers/net/wireless/zd1211rw/zd_usb.h
@@ -217,8 +217,11 @@ struct zd_usb {
struct zd_usb_rx rx;
struct zd_usb_tx tx;
struct usb_interface *intf;
+ struct usb_anchor submitted_cmds;
+ struct urb *urb_async_waiting;
+ int cmd_error;
u8 req_buf[64]; /* zd_usb_iowrite16v needs 62 bytes */
- u8 is_zd1211b:1, initialized:1, was_running:1;
+ u8 is_zd1211b:1, initialized:1, was_running:1, in_async:1;
};
#define zd_usb_dev(usb) (&usb->intf->dev)
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 3/4] zd1211rw: move async iowrite16v up to callers
2011-02-12 18:43 [PATCH 0/4] Fix high CPU usage in AP-mode Jussi Kivilinna
2011-02-12 18:43 ` [PATCH 1/4] zd1211rw: correct use of usb_bulk_msg on interrupt endpoints Jussi Kivilinna
2011-02-12 18:43 ` [PATCH 2/4] zd1211rw: use async urb for write command Jussi Kivilinna
@ 2011-02-12 18:43 ` Jussi Kivilinna
2011-02-12 18:43 ` [PATCH 4/4] zd1211rw: add unlikely to ZD_ASSERT Jussi Kivilinna
3 siblings, 0 replies; 6+ messages in thread
From: Jussi Kivilinna @ 2011-02-12 18:43 UTC (permalink / raw)
To: linux-wireless; +Cc: Daniel Drake, John W. Linville, Ulrich Kunitz
Writing beacon to device happen through multiple write command calls.
zd_usb_iowrite16v uses synchronous urb call and with multiple write
commands in row causes high CPU usage.
Make asynchronous zd_usb_iowrite16v_async available outside zd_usb.c
and use where possible.
This lower CPU usage from ~10% to ~2% on Intel Atom when running
AP-mode with 100 TU beacon interval.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
---
drivers/net/wireless/zd1211rw/zd_chip.c | 35 +++++++++++++++++++++++++------
drivers/net/wireless/zd1211rw/zd_usb.c | 11 ++++------
drivers/net/wireless/zd1211rw/zd_usb.h | 4 ++++
3 files changed, 37 insertions(+), 13 deletions(-)
diff --git a/drivers/net/wireless/zd1211rw/zd_chip.c b/drivers/net/wireless/zd1211rw/zd_chip.c
index 54f68f1..a73a305 100644
--- a/drivers/net/wireless/zd1211rw/zd_chip.c
+++ b/drivers/net/wireless/zd1211rw/zd_chip.c
@@ -142,8 +142,9 @@ int zd_ioread32v_locked(struct zd_chip *chip, u32 *values, const zd_addr_t *addr
return 0;
}
-int _zd_iowrite32v_locked(struct zd_chip *chip, const struct zd_ioreq32 *ioreqs,
- unsigned int count)
+static int _zd_iowrite32v_async_locked(struct zd_chip *chip,
+ const struct zd_ioreq32 *ioreqs,
+ unsigned int count)
{
int i, j, r;
struct zd_ioreq16 ioreqs16[USB_MAX_IOWRITE32_COUNT * 2];
@@ -170,7 +171,7 @@ int _zd_iowrite32v_locked(struct zd_chip *chip, const struct zd_ioreq32 *ioreqs,
ioreqs16[j+1].addr = ioreqs[i].addr;
}
- r = zd_usb_iowrite16v(&chip->usb, ioreqs16, count16);
+ r = zd_usb_iowrite16v_async(&chip->usb, ioreqs16, count16);
#ifdef DEBUG
if (r) {
dev_dbg_f(zd_chip_dev(chip),
@@ -180,6 +181,20 @@ int _zd_iowrite32v_locked(struct zd_chip *chip, const struct zd_ioreq32 *ioreqs,
return r;
}
+int _zd_iowrite32v_locked(struct zd_chip *chip, const struct zd_ioreq32 *ioreqs,
+ unsigned int count)
+{
+ int r;
+
+ zd_usb_iowrite16v_async_start(&chip->usb);
+ r = _zd_iowrite32v_async_locked(chip, ioreqs, count);
+ if (r) {
+ zd_usb_iowrite16v_async_end(&chip->usb, 0);
+ return r;
+ }
+ return zd_usb_iowrite16v_async_end(&chip->usb, 50 /* ms */);
+}
+
int zd_iowrite16a_locked(struct zd_chip *chip,
const struct zd_ioreq16 *ioreqs, unsigned int count)
{
@@ -187,6 +202,8 @@ int zd_iowrite16a_locked(struct zd_chip *chip,
unsigned int i, j, t, max;
ZD_ASSERT(mutex_is_locked(&chip->mutex));
+ zd_usb_iowrite16v_async_start(&chip->usb);
+
for (i = 0; i < count; i += j + t) {
t = 0;
max = count-i;
@@ -199,8 +216,9 @@ int zd_iowrite16a_locked(struct zd_chip *chip,
}
}
- r = zd_usb_iowrite16v(&chip->usb, &ioreqs[i], j);
+ r = zd_usb_iowrite16v_async(&chip->usb, &ioreqs[i], j);
if (r) {
+ zd_usb_iowrite16v_async_end(&chip->usb, 0);
dev_dbg_f(zd_chip_dev(chip),
"error zd_usb_iowrite16v. Error number %d\n",
r);
@@ -208,7 +226,7 @@ int zd_iowrite16a_locked(struct zd_chip *chip,
}
}
- return 0;
+ return zd_usb_iowrite16v_async_end(&chip->usb, 50 /* ms */);
}
/* Writes a variable number of 32 bit registers. The functions will split
@@ -221,6 +239,8 @@ int zd_iowrite32a_locked(struct zd_chip *chip,
int r;
unsigned int i, j, t, max;
+ zd_usb_iowrite16v_async_start(&chip->usb);
+
for (i = 0; i < count; i += j + t) {
t = 0;
max = count-i;
@@ -233,8 +253,9 @@ int zd_iowrite32a_locked(struct zd_chip *chip,
}
}
- r = _zd_iowrite32v_locked(chip, &ioreqs[i], j);
+ r = _zd_iowrite32v_async_locked(chip, &ioreqs[i], j);
if (r) {
+ zd_usb_iowrite16v_async_end(&chip->usb, 0);
dev_dbg_f(zd_chip_dev(chip),
"error _zd_iowrite32v_locked."
" Error number %d\n", r);
@@ -242,7 +263,7 @@ int zd_iowrite32a_locked(struct zd_chip *chip,
}
}
- return 0;
+ return zd_usb_iowrite16v_async_end(&chip->usb, 50 /* ms */);
}
int zd_ioread16(struct zd_chip *chip, zd_addr_t addr, u16 *value)
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c
index c98f6e7..81e8048 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -1674,7 +1674,7 @@ static void iowrite16v_urb_complete(struct urb *urb)
static int zd_submit_waiting_urb(struct zd_usb *usb, bool last)
{
- int r;
+ int r = 0;
struct urb *urb = usb->urb_async_waiting;
if (!urb)
@@ -1700,7 +1700,7 @@ error:
return r;
}
-static void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
+void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
{
ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds));
ZD_ASSERT(usb->urb_async_waiting == NULL);
@@ -1713,7 +1713,7 @@ static void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
usb->urb_async_waiting = NULL;
}
-static int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout)
+int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout)
{
int r;
@@ -1749,9 +1749,8 @@ error:
return r;
}
-static int zd_usb_iowrite16v_async(struct zd_usb *usb,
- const struct zd_ioreq16 *ioreqs,
- unsigned int count)
+int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
+ unsigned int count)
{
int r;
struct usb_device *udev;
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.h b/drivers/net/wireless/zd1211rw/zd_usb.h
index 9291426..b3df2c8 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.h
+++ b/drivers/net/wireless/zd1211rw/zd_usb.h
@@ -273,6 +273,10 @@ static inline int zd_usb_ioread16(struct zd_usb *usb, u16 *value,
return zd_usb_ioread16v(usb, value, (const zd_addr_t *)&addr, 1);
}
+void zd_usb_iowrite16v_async_start(struct zd_usb *usb);
+int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout);
+int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
+ unsigned int count);
int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
unsigned int count);
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 4/4] zd1211rw: add unlikely to ZD_ASSERT
2011-02-12 18:43 [PATCH 0/4] Fix high CPU usage in AP-mode Jussi Kivilinna
` (2 preceding siblings ...)
2011-02-12 18:43 ` [PATCH 3/4] zd1211rw: move async iowrite16v up to callers Jussi Kivilinna
@ 2011-02-12 18:43 ` Jussi Kivilinna
3 siblings, 0 replies; 6+ messages in thread
From: Jussi Kivilinna @ 2011-02-12 18:43 UTC (permalink / raw)
To: linux-wireless; +Cc: Daniel Drake, John W. Linville, Ulrich Kunitz
Case assert is violated should be quite unlikely.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
---
drivers/net/wireless/zd1211rw/zd_def.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/net/wireless/zd1211rw/zd_def.h b/drivers/net/wireless/zd1211rw/zd_def.h
index 6ac597f..5463ca9 100644
--- a/drivers/net/wireless/zd1211rw/zd_def.h
+++ b/drivers/net/wireless/zd1211rw/zd_def.h
@@ -45,7 +45,7 @@ typedef u16 __nocast zd_addr_t;
#ifdef DEBUG
# define ZD_ASSERT(x) \
do { \
- if (!(x)) { \
+ if (unlikely(!(x))) { \
pr_debug("%s:%d ASSERT %s VIOLATED!\n", \
__FILE__, __LINE__, __stringify(x)); \
dump_stack(); \
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