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SLOW_WORK: Wait for outstanding work items belonging to a module to clear

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Wait for outstanding slow work items belonging to a module to clear when
unregistering that module as a user of the facility.  This prevents the put_ref
code of a work item from being taken away before it returns.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2009-11-19 18:10:23 +00:00
parent 66b00a7c93
commit 3d7a641e54
8 changed files with 150 additions and 16 deletions
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8
include/linux/slow-work.h
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@@ -24,6 +24,9 @@ struct slow_work;
* The operations used to support slow work items
*/
struct slow_work_ops {
/* owner */
struct module *owner;
/* get a ref on a work item
* - return 0 if successful, -ve if not
*/
@@ -42,6 +45,7 @@ struct slow_work_ops {
* queued
*/
struct slow_work {
struct module *owner; /* the owning module */
unsigned long flags;
#define SLOW_WORK_PENDING 0 /* item pending (further) execution */
#define SLOW_WORK_EXECUTING 1 /* item currently executing */
@@ -84,8 +88,8 @@ static inline void vslow_work_init(struct slow_work *work,
}
extern int slow_work_enqueue(struct slow_work *work);
extern int slow_work_register_user(void);
extern void slow_work_unregister_user(void);
extern int slow_work_register_user(struct module *owner);
extern void slow_work_unregister_user(struct module *owner);
#ifdef CONFIG_SYSCTL
extern ctl_table slow_work_sysctls[];