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Date: Sun, 12 Dec 2010 16:53:04 +0100
From: Tejun Heo <tj@...nel.org>
To: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
davem@...emloft.net
Cc: Tejun Heo <tj@...nel.org>,
Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>,
linux-wimax@...el.com
Subject: [PATCH 8/9] i2400m: drop i2400m_schedule_work()
i2400m implements dynamic work allocation and queueing mechanism in
i2400_schedule_work(); however, this is only used for reset and
recovery which can be served equally well with preallocated per device
works.
Replace i2400m_schedule_work() with two work structs in struct i2400m.
These works are explicitly canceled when the device is released making
calls to flush_scheduled_work(), which is being deprecated,
unnecessary.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>
Cc: linux-wimax@...el.com
Cc: netdev@...r.kernel.org
---
drivers/net/wimax/i2400m/driver.c | 96 ++++++------------------------------
drivers/net/wimax/i2400m/i2400m.h | 19 ++-----
drivers/net/wimax/i2400m/sdio.c | 1 -
drivers/net/wimax/i2400m/usb.c | 1 -
4 files changed, 21 insertions(+), 96 deletions(-)
diff --git a/drivers/net/wimax/i2400m/driver.c b/drivers/net/wimax/i2400m/driver.c
index cdedab4..f060332 100644
--- a/drivers/net/wimax/i2400m/driver.c
+++ b/drivers/net/wimax/i2400m/driver.c
@@ -92,54 +92,6 @@ MODULE_PARM_DESC(barkers,
"signal; values are appended to a list--setting one value "
"as zero cleans the existing list and starts a new one.");
-static
-struct i2400m_work *__i2400m_work_setup(
- struct i2400m *i2400m, void (*fn)(struct work_struct *),
- gfp_t gfp_flags, const void *pl, size_t pl_size)
-{
- struct i2400m_work *iw;
-
- iw = kzalloc(sizeof(*iw) + pl_size, gfp_flags);
- if (iw == NULL)
- return NULL;
- iw->i2400m = i2400m_get(i2400m);
- iw->pl_size = pl_size;
- memcpy(iw->pl, pl, pl_size);
- INIT_WORK(&iw->ws, fn);
- return iw;
-}
-
-
-/*
- * Schedule i2400m's specific work on the system's queue.
- *
- * Used for a few cases where we really need it; otherwise, identical
- * to i2400m_queue_work().
- *
- * Returns < 0 errno code on error, 1 if ok.
- *
- * If it returns zero, something really bad happened, as it means the
- * works struct was already queued, but we have just allocated it, so
- * it should not happen.
- */
-static int i2400m_schedule_work(struct i2400m *i2400m,
- void (*fn)(struct work_struct *), gfp_t gfp_flags,
- const void *pl, size_t pl_size)
-{
- int result;
- struct i2400m_work *iw;
-
- result = -ENOMEM;
- iw = __i2400m_work_setup(i2400m, fn, gfp_flags, pl, pl_size);
- if (iw != NULL) {
- result = schedule_work(&iw->ws);
- if (WARN_ON(result == 0))
- result = -ENXIO;
- }
- return result;
-}
-
-
/*
* WiMAX stack operation: relay a message from user space
*
@@ -648,17 +600,11 @@ EXPORT_SYMBOL_GPL(i2400m_post_reset);
static
void __i2400m_dev_reset_handle(struct work_struct *ws)
{
- int result;
- struct i2400m_work *iw = container_of(ws, struct i2400m_work, ws);
- const char *reason;
- struct i2400m *i2400m = iw->i2400m;
+ struct i2400m *i2400m = container_of(ws, struct i2400m, reset_ws);
+ const char *reason = i2400m->reset_reason;
struct device *dev = i2400m_dev(i2400m);
struct i2400m_reset_ctx *ctx = i2400m->reset_ctx;
-
- if (WARN_ON(iw->pl_size != sizeof(reason)))
- reason = "SW BUG: reason n/a";
- else
- memcpy(&reason, iw->pl, sizeof(reason));
+ int result;
d_fnstart(3, dev, "(ws %p i2400m %p reason %s)\n", ws, i2400m, reason);
@@ -733,8 +679,6 @@ void __i2400m_dev_reset_handle(struct work_struct *ws)
}
}
out:
- i2400m_put(i2400m);
- kfree(iw);
d_fnend(3, dev, "(ws %p i2400m %p reason %s) = void\n",
ws, i2400m, reason);
}
@@ -754,8 +698,8 @@ out:
*/
int i2400m_dev_reset_handle(struct i2400m *i2400m, const char *reason)
{
- return i2400m_schedule_work(i2400m, __i2400m_dev_reset_handle,
- GFP_ATOMIC, &reason, sizeof(reason));
+ i2400m->reset_reason = reason;
+ return schedule_work(&i2400m->reset_ws);
}
EXPORT_SYMBOL_GPL(i2400m_dev_reset_handle);
@@ -768,14 +712,9 @@ EXPORT_SYMBOL_GPL(i2400m_dev_reset_handle);
static
void __i2400m_error_recovery(struct work_struct *ws)
{
- struct i2400m_work *iw = container_of(ws, struct i2400m_work, ws);
- struct i2400m *i2400m = iw->i2400m;
+ struct i2400m *i2400m = container_of(ws, struct i2400m, recovery_ws);
i2400m_reset(i2400m, I2400M_RT_BUS);
-
- i2400m_put(i2400m);
- kfree(iw);
- return;
}
/*
@@ -805,18 +744,10 @@ void __i2400m_error_recovery(struct work_struct *ws)
*/
void i2400m_error_recovery(struct i2400m *i2400m)
{
- struct device *dev = i2400m_dev(i2400m);
-
- if (atomic_add_return(1, &i2400m->error_recovery) == 1) {
- if (i2400m_schedule_work(i2400m, __i2400m_error_recovery,
- GFP_ATOMIC, NULL, 0) < 0) {
- dev_err(dev, "run out of memory for "
- "scheduling an error recovery ?\n");
- atomic_dec(&i2400m->error_recovery);
- }
- } else
+ if (atomic_add_return(1, &i2400m->error_recovery) == 1)
+ schedule_work(&i2400m->recovery_ws);
+ else
atomic_dec(&i2400m->error_recovery);
- return;
}
EXPORT_SYMBOL_GPL(i2400m_error_recovery);
@@ -886,6 +817,10 @@ void i2400m_init(struct i2400m *i2400m)
mutex_init(&i2400m->init_mutex);
/* wake_tx_ws is initialized in i2400m_tx_setup() */
+
+ INIT_WORK(&i2400m->reset_ws, __i2400m_dev_reset_handle);
+ INIT_WORK(&i2400m->recovery_ws, __i2400m_error_recovery);
+
atomic_set(&i2400m->bus_reset_retries, 0);
i2400m->alive = 0;
@@ -1040,6 +975,9 @@ void i2400m_release(struct i2400m *i2400m)
i2400m_dev_stop(i2400m);
+ cancel_work_sync(&i2400m->reset_ws);
+ cancel_work_sync(&i2400m->recovery_ws);
+
i2400m_debugfs_rm(i2400m);
sysfs_remove_group(&i2400m->wimax_dev.net_dev->dev.kobj,
&i2400m_dev_attr_group);
@@ -1083,8 +1021,6 @@ module_init(i2400m_driver_init);
static
void __exit i2400m_driver_exit(void)
{
- /* for scheds i2400m_dev_reset_handle() */
- flush_scheduled_work();
i2400m_barker_db_exit();
}
module_exit(i2400m_driver_exit);
diff --git a/drivers/net/wimax/i2400m/i2400m.h b/drivers/net/wimax/i2400m/i2400m.h
index 59ac770..17ecaa4 100644
--- a/drivers/net/wimax/i2400m/i2400m.h
+++ b/drivers/net/wimax/i2400m/i2400m.h
@@ -632,6 +632,11 @@ struct i2400m {
struct work_struct wake_tx_ws;
struct sk_buff *wake_tx_skb;
+ struct work_struct reset_ws;
+ const char *reset_reason;
+
+ struct work_struct recovery_ws;
+
struct dentry *debugfs_dentry;
const char *fw_name; /* name of the current firmware image */
unsigned long fw_version; /* version of the firmware interface */
@@ -896,20 +901,6 @@ struct device *i2400m_dev(struct i2400m *i2400m)
return i2400m->wimax_dev.net_dev->dev.parent;
}
-/*
- * Helper for scheduling simple work functions
- *
- * This struct can get any kind of payload attached (normally in the
- * form of a struct where you pack the stuff you want to pass to the
- * _work function).
- */
-struct i2400m_work {
- struct work_struct ws;
- struct i2400m *i2400m;
- size_t pl_size;
- u8 pl[0];
-};
-
extern int i2400m_msg_check_status(const struct i2400m_l3l4_hdr *,
char *, size_t);
extern int i2400m_msg_size_check(struct i2400m *,
diff --git a/drivers/net/wimax/i2400m/sdio.c b/drivers/net/wimax/i2400m/sdio.c
index 9bfc26e..be428ca 100644
--- a/drivers/net/wimax/i2400m/sdio.c
+++ b/drivers/net/wimax/i2400m/sdio.c
@@ -590,7 +590,6 @@ module_init(i2400ms_driver_init);
static
void __exit i2400ms_driver_exit(void)
{
- flush_scheduled_work(); /* for the stuff we schedule */
sdio_unregister_driver(&i2400m_sdio_driver);
}
module_exit(i2400ms_driver_exit);
diff --git a/drivers/net/wimax/i2400m/usb.c b/drivers/net/wimax/i2400m/usb.c
index d3365ac..10e3ab3 100644
--- a/drivers/net/wimax/i2400m/usb.c
+++ b/drivers/net/wimax/i2400m/usb.c
@@ -780,7 +780,6 @@ module_init(i2400mu_driver_init);
static
void __exit i2400mu_driver_exit(void)
{
- flush_scheduled_work(); /* for the stuff we schedule from sysfs.c */
usb_deregister(&i2400mu_driver);
}
module_exit(i2400mu_driver_exit);
--
1.7.1
--
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