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Message-ID: <Pine.LNX.4.44L0.0608281626320.6800-100000@iolanthe.rowland.org>
Date: Mon, 28 Aug 2006 16:28:14 -0400 (EDT)
From: Alan Stern <stern@...land.harvard.edu>
To: Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>
cc: Kernel development list <linux-kernel@...r.kernel.org>,
SCSI development list <linux-scsi@...r.kernel.org>,
Jens Axboe <axboe@...e.de>
Subject: [PATCH 1/3] Change return value from queue_work
This patch (as774) renames:
queue_work() to add_work_to_q(),
queue_delayed_work() to add_delayed_work_to_q(),
queue_delayed_work_on() to add_delayed_work_to_q_on().
The return value is altered, so that now 0 = success and -EBUSY = failure.
New routines with the original names are added, so that the majority of
callers don't need any changes. The new routines call the original
functions, call WARN_ON if there was a failure, and then return void.
Finally, fc_queue_work(), fc_queue_devloss_work(), scsi_queue_work(),
and kblockd_schedule_work() were changed to return void.
Signed-off-by: Alan Stern <stern@...land.harvard.edu>
Index: mm/drivers/message/i2o/i2o_block.c
===================================================================
--- mm.orig/drivers/message/i2o/i2o_block.c
+++ mm/drivers/message/i2o/i2o_block.c
@@ -941,9 +941,9 @@ static void i2o_block_request_fn(struct
INIT_WORK(&dreq->work, i2o_block_delayed_request_fn,
dreq);
- if (!queue_delayed_work(i2o_block_driver.event_queue,
+ if (add_delayed_work_to_q(i2o_block_driver.event_queue,
&dreq->work,
- I2O_BLOCK_RETRY_TIME))
+ I2O_BLOCK_RETRY_TIME) < 0)
kfree(dreq);
else {
blk_stop_queue(q);
Index: mm/drivers/ata/libata-core.c
===================================================================
--- mm.orig/drivers/ata/libata-core.c
+++ mm/drivers/ata/libata-core.c
@@ -933,12 +933,12 @@ void ata_port_queue_task(struct ata_port
PREPARE_WORK(&ap->port_task, fn, data);
if (!delay)
- rc = queue_work(ata_wq, &ap->port_task);
+ rc = add_work_to_q(ata_wq, &ap->port_task);
else
- rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
+ rc = add_delayed_work_to_q(ata_wq, &ap->port_task, delay);
- /* rc == 0 means that another user is using port task */
- WARN_ON(rc == 0);
+ /* rc < 0 means that another user is using port task */
+ WARN_ON(rc < 0);
}
/**
Index: mm/drivers/scsi/scsi_transport_fc.c
===================================================================
--- mm.orig/drivers/scsi/scsi_transport_fc.c
+++ mm/drivers/scsi/scsi_transport_fc.c
@@ -34,7 +34,7 @@
#include <scsi/scsi_cmnd.h>
#include "scsi_priv.h"
-static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
+static void fc_queue_work(struct Scsi_Host *, struct work_struct *);
/*
* Redefine so that we can have same named attributes in the
@@ -1283,12 +1283,8 @@ EXPORT_SYMBOL(fc_release_transport);
* @shost: Pointer to Scsi_Host bound to fc_host.
* @work: Work to queue for execution.
*
- * Return value:
- * 1 - work queued for execution
- * 0 - work is already queued
- * -EINVAL - work queue doesn't exist
**/
-static int
+static void
fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
{
if (unlikely(!fc_host_work_q(shost))) {
@@ -1297,10 +1293,10 @@ fc_queue_work(struct Scsi_Host *shost, s
"when no workqueue created.\n", shost->hostt->name);
dump_stack();
- return -EINVAL;
+ return;
}
- return queue_work(fc_host_work_q(shost), work);
+ queue_work(fc_host_work_q(shost), work);
}
/**
@@ -1326,11 +1322,8 @@ fc_flush_work(struct Scsi_Host *shost)
* @shost: Pointer to Scsi_Host bound to fc_host.
* @work: Work to queue for execution.
* @delay: jiffies to delay the work queuing
- *
- * Return value:
- * 0 on success / != 0 for error
**/
-static int
+static void
fc_queue_devloss_work(struct Scsi_Host *shost, struct work_struct *work,
unsigned long delay)
{
@@ -1340,10 +1333,10 @@ fc_queue_devloss_work(struct Scsi_Host *
"when no workqueue created.\n", shost->hostt->name);
dump_stack();
- return -EINVAL;
+ return;
}
- return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
+ queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
}
/**
Index: mm/block/ll_rw_blk.c
===================================================================
--- mm.orig/block/ll_rw_blk.c
+++ mm/block/ll_rw_blk.c
@@ -3530,9 +3530,9 @@ void blk_rq_bio_prep(request_queue_t *q,
EXPORT_SYMBOL(blk_rq_bio_prep);
-int kblockd_schedule_work(struct work_struct *work)
+void kblockd_schedule_work(struct work_struct *work)
{
- return queue_work(kblockd_workqueue, work);
+ queue_work(kblockd_workqueue, work);
}
EXPORT_SYMBOL(kblockd_schedule_work);
Index: mm/drivers/connector/connector.c
===================================================================
--- mm.orig/drivers/connector/connector.c
+++ mm/drivers/connector/connector.c
@@ -142,8 +142,8 @@ static int cn_call_callback(struct cn_ms
__cbq->data.ddata = data;
__cbq->data.destruct_data = destruct_data;
- if (queue_work(dev->cbdev->cn_queue,
- &__cbq->work))
+ if (add_work_to_q(dev->cbdev->cn_queue,
+ &__cbq->work) == 0)
err = 0;
} else {
struct work_struct *w;
@@ -165,7 +165,8 @@ static int cn_call_callback(struct cn_ms
w->data = d;
init_timer(&w->timer);
- if (queue_work(dev->cbdev->cn_queue, w))
+ if (add_work_to_q(dev->cbdev->cn_queue,
+ w) == 0)
err = 0;
else {
kfree(w);
Index: mm/kernel/workqueue.c
===================================================================
--- mm.orig/kernel/workqueue.c
+++ mm/kernel/workqueue.c
@@ -80,7 +80,7 @@ static inline int is_single_threaded(str
}
/* Preempt must be disabled. */
-static void __queue_work(struct cpu_workqueue_struct *cwq,
+static void __add_work_to_q(struct cpu_workqueue_struct *cwq,
struct work_struct *work)
{
unsigned long flags;
@@ -94,30 +94,31 @@ static void __queue_work(struct cpu_work
}
/**
- * queue_work - queue work on a workqueue
+ * add_work_to_q - queue work on a workqueue
* @wq: workqueue to use
* @work: work to queue
*
- * Returns non-zero if it was successfully added.
+ * Returns zero if it was successfully added, -EBUSY if @work is in use.
*
* We queue the work to the CPU it was submitted, but there is no
* guarantee that it will be processed by that CPU.
*/
-int fastcall queue_work(struct workqueue_struct *wq, struct work_struct *work)
+int fastcall add_work_to_q(struct workqueue_struct *wq,
+ struct work_struct *work)
{
- int ret = 0, cpu = get_cpu();
+ int ret = -EBUSY, cpu = get_cpu();
if (!test_and_set_bit(0, &work->pending)) {
if (unlikely(is_single_threaded(wq)))
cpu = singlethread_cpu;
BUG_ON(!list_empty(&work->entry));
- __queue_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
- ret = 1;
+ __add_work_to_q(per_cpu_ptr(wq->cpu_wq, cpu), work);
+ ret = 0;
}
put_cpu();
return ret;
}
-EXPORT_SYMBOL_GPL(queue_work);
+EXPORT_SYMBOL_GPL(add_work_to_q);
static void delayed_work_timer_fn(unsigned long __data)
{
@@ -128,21 +129,21 @@ static void delayed_work_timer_fn(unsign
if (unlikely(is_single_threaded(wq)))
cpu = singlethread_cpu;
- __queue_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
+ __add_work_to_q(per_cpu_ptr(wq->cpu_wq, cpu), work);
}
/**
- * queue_delayed_work - queue work on a workqueue after delay
+ * add_delayed_work_to_q - queue work on a workqueue after delay
* @wq: workqueue to use
* @work: work to queue
* @delay: number of jiffies to wait before queueing
*
- * Returns non-zero if it was successfully added.
+ * Returns zero if it was successfully added, -EBUSY if @work is in use.
*/
-int fastcall queue_delayed_work(struct workqueue_struct *wq,
+int fastcall add_delayed_work_to_q(struct workqueue_struct *wq,
struct work_struct *work, unsigned long delay)
{
- int ret = 0;
+ int ret = -EBUSY;
struct timer_list *timer = &work->timer;
if (!test_and_set_bit(0, &work->pending)) {
@@ -155,25 +156,25 @@ int fastcall queue_delayed_work(struct w
timer->data = (unsigned long)work;
timer->function = delayed_work_timer_fn;
add_timer(timer);
- ret = 1;
+ ret = 0;
}
return ret;
}
-EXPORT_SYMBOL_GPL(queue_delayed_work);
+EXPORT_SYMBOL_GPL(add_delayed_work_to_q);
/**
- * queue_delayed_work_on - queue work on specific CPU after delay
+ * add_delayed_work_to_q_on - queue work on specific CPU after delay
* @cpu: CPU number to execute work on
* @wq: workqueue to use
* @work: work to queue
* @delay: number of jiffies to wait before queueing
*
- * Returns non-zero if it was successfully added.
+ * Returns zero if it was successfully added, -EBUSY if @work is in use.
*/
-int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
+int add_delayed_work_to_q_on(int cpu, struct workqueue_struct *wq,
struct work_struct *work, unsigned long delay)
{
- int ret = 0;
+ int ret = -EBUSY;
struct timer_list *timer = &work->timer;
if (!test_and_set_bit(0, &work->pending)) {
@@ -186,11 +187,11 @@ int queue_delayed_work_on(int cpu, struc
timer->data = (unsigned long)work;
timer->function = delayed_work_timer_fn;
add_timer_on(timer, cpu);
- ret = 1;
+ ret = 0;
}
return ret;
}
-EXPORT_SYMBOL_GPL(queue_delayed_work_on);
+EXPORT_SYMBOL_GPL(add_delayed_work_to_q_on);
static void run_workqueue(struct cpu_workqueue_struct *cwq)
{
@@ -455,7 +456,7 @@ static struct workqueue_struct *keventd_
*/
int fastcall schedule_work(struct work_struct *work)
{
- return queue_work(keventd_wq, work);
+ return !add_work_to_q(keventd_wq, work);
}
EXPORT_SYMBOL(schedule_work);
@@ -469,7 +470,7 @@ EXPORT_SYMBOL(schedule_work);
*/
int fastcall schedule_delayed_work(struct work_struct *work, unsigned long delay)
{
- return queue_delayed_work(keventd_wq, work, delay);
+ return !add_delayed_work_to_q(keventd_wq, work, delay);
}
EXPORT_SYMBOL(schedule_delayed_work);
@@ -485,10 +486,43 @@ EXPORT_SYMBOL(schedule_delayed_work);
int schedule_delayed_work_on(int cpu,
struct work_struct *work, unsigned long delay)
{
- return queue_delayed_work_on(cpu, keventd_wq, work, delay);
+ return !add_delayed_work_to_q_on(cpu, keventd_wq, work, delay);
}
EXPORT_SYMBOL(schedule_delayed_work_on);
+/*
+ * Legacy API for use when the return codes aren't needed.
+ * These routines call WARN_ON() if the underlying function fails.
+ */
+void fastcall queue_work(struct workqueue_struct *wq, struct work_struct *work)
+{
+ int rc;
+
+ rc = add_work_to_q(wq, work);
+ WARN_ON(rc < 0);
+}
+EXPORT_SYMBOL(queue_work);
+
+void fastcall queue_delayed_work(struct workqueue_struct *wq,
+ struct work_struct *work, unsigned long delay)
+{
+ int rc;
+
+ rc = add_delayed_work_to_q(wq, work, delay);
+ WARN_ON(rc < 0);
+}
+EXPORT_SYMBOL(queue_delayed_work);
+
+void queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
+ struct work_struct *work, unsigned long delay)
+{
+ int rc;
+
+ rc = add_delayed_work_to_q_on(cpu, wq, work, delay);
+ WARN_ON(rc < 0);
+}
+EXPORT_SYMBOL(queue_delayed_work_on);
+
/**
* schedule_on_each_cpu - call a function on each online CPU from keventd
* @func: the function to call
@@ -513,7 +547,7 @@ int schedule_on_each_cpu(void (*func)(vo
mutex_lock(&workqueue_mutex);
for_each_online_cpu(cpu) {
INIT_WORK(per_cpu_ptr(works, cpu), func, info);
- __queue_work(per_cpu_ptr(keventd_wq->cpu_wq, cpu),
+ __add_work_to_q(per_cpu_ptr(keventd_wq->cpu_wq, cpu),
per_cpu_ptr(works, cpu));
}
mutex_unlock(&workqueue_mutex);
@@ -617,7 +651,8 @@ static void take_over_work(struct workqu
printk("Taking work for %s\n", wq->name);
work = list_entry(list.next,struct work_struct,entry);
list_del(&work->entry);
- __queue_work(per_cpu_ptr(wq->cpu_wq, smp_processor_id()), work);
+ __add_work_to_q(per_cpu_ptr(wq->cpu_wq, smp_processor_id()),
+ work);
}
spin_unlock_irq(&cwq->lock);
}
Index: mm/net/sunrpc/sched.c
===================================================================
--- mm.orig/net/sunrpc/sched.c
+++ mm/net/sunrpc/sched.c
@@ -313,7 +313,7 @@ static void rpc_make_runnable(struct rpc
int status;
INIT_WORK(&task->u.tk_work, rpc_async_schedule, (void *)task);
- status = queue_work(task->tk_workqueue, &task->u.tk_work);
+ status = add_work_to_q(task->tk_workqueue, &task->u.tk_work);
if (status < 0) {
printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status);
task->tk_status = status;
Index: mm/include/scsi/scsi_host.h
===================================================================
--- mm.orig/include/scsi/scsi_host.h
+++ mm/include/scsi/scsi_host.h
@@ -666,7 +666,7 @@ static inline int scsi_host_in_recovery(
shost->tmf_in_progress;
}
-extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *);
+extern void scsi_queue_work(struct Scsi_Host *, struct work_struct *);
extern void scsi_flush_work(struct Scsi_Host *);
extern struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *, int);
Index: mm/include/linux/workqueue.h
===================================================================
--- mm.orig/include/linux/workqueue.h
+++ mm/include/linux/workqueue.h
@@ -61,10 +61,12 @@ extern struct workqueue_struct *__create
extern void destroy_workqueue(struct workqueue_struct *wq);
-extern int FASTCALL(queue_work(struct workqueue_struct *wq, struct work_struct *work));
-extern int FASTCALL(queue_delayed_work(struct workqueue_struct *wq, struct work_struct *work, unsigned long delay));
-extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
- struct work_struct *work, unsigned long delay);
+extern int FASTCALL(add_work_to_q(struct workqueue_struct *wq,
+ struct work_struct *work));
+extern int FASTCALL(add_delayed_work_to_q(struct workqueue_struct *wq,
+ struct work_struct *work, unsigned long delay));
+extern int add_delayed_work_to_q_on(int cpu, struct workqueue_struct *wq,
+ struct work_struct *work, unsigned long delay);
extern void FASTCALL(flush_workqueue(struct workqueue_struct *wq));
extern int FASTCALL(schedule_work(struct work_struct *work));
@@ -98,4 +100,15 @@ static inline int cancel_delayed_work(st
return ret;
}
+/*
+ * Legacy APIs, used by old drivers that don't care about the return code.
+ * These routines call WARN_ON() if the underlying function fails.
+ */
+extern void FASTCALL(queue_work(struct workqueue_struct *wq,
+ struct work_struct *work));
+extern void FASTCALL(queue_delayed_work(struct workqueue_struct *wq,
+ struct work_struct *work, unsigned long delay));
+extern void queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
+ struct work_struct *work, unsigned long delay);
+
#endif
Index: mm/drivers/scsi/hosts.c
===================================================================
--- mm.orig/drivers/scsi/hosts.c
+++ mm/drivers/scsi/hosts.c
@@ -487,16 +487,11 @@ int scsi_is_host_device(const struct dev
EXPORT_SYMBOL(scsi_is_host_device);
/**
- * scsi_queue_work - Queue work to the Scsi_Host workqueue.
+ * scsi_queue_work - Submit work to the Scsi_Host workqueue.
* @shost: Pointer to Scsi_Host.
* @work: Work to queue for execution.
- *
- * Return value:
- * 1 - work queued for execution
- * 0 - work is already queued
- * -EINVAL - work queue doesn't exist
**/
-int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work)
+void scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work)
{
if (unlikely(!shost->work_q)) {
printk(KERN_ERR
@@ -504,10 +499,10 @@ int scsi_queue_work(struct Scsi_Host *sh
"when no workqueue created.\n", shost->hostt->name);
dump_stack();
- return -EINVAL;
+ return;
}
- return queue_work(shost->work_q, work);
+ queue_work(shost->work_q, work);
}
EXPORT_SYMBOL_GPL(scsi_queue_work);
Index: mm/fs/ocfs2/cluster/tcp.c
===================================================================
--- mm.orig/fs/ocfs2/cluster/tcp.c
+++ mm/fs/ocfs2/cluster/tcp.c
@@ -338,7 +338,7 @@ static void o2net_sc_queue_work(struct o
struct work_struct *work)
{
sc_get(sc);
- if (!queue_work(o2net_wq, work))
+ if (add_work_to_q(o2net_wq, work) < 0)
sc_put(sc);
}
static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
@@ -346,7 +346,7 @@ static void o2net_sc_queue_delayed_work(
int delay)
{
sc_get(sc);
- if (!queue_delayed_work(o2net_wq, work, delay))
+ if (add_delayed_work_to_q(o2net_wq, work, delay) < 0)
sc_put(sc);
}
static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
Index: mm/include/linux/blkdev.h
===================================================================
--- mm.orig/include/linux/blkdev.h
+++ mm/include/linux/blkdev.h
@@ -813,7 +813,7 @@ static inline void put_dev_sector(Sector
}
struct work_struct;
-int kblockd_schedule_work(struct work_struct *work);
+void kblockd_schedule_work(struct work_struct *work);
void kblockd_flush(void);
#ifdef CONFIG_LBD
Index: mm/drivers/acpi/osl.c
===================================================================
--- mm.orig/drivers/acpi/osl.c
+++ mm/drivers/acpi/osl.c
@@ -636,9 +636,9 @@ acpi_status acpi_os_execute(acpi_execute
task = (void *)(dpc + 1);
INIT_WORK(task, acpi_os_execute_deferred, (void *)dpc);
- if (!queue_work(kacpid_wq, task)) {
+ if (add_work_to_q(kacpid_wq, task) < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Call to queue_work() failed.\n"));
+ "Call to add_work_to_q() failed.\n"));
kfree(dpc);
status = AE_ERROR;
}
-
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