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author | David Howells <dhowells@redhat.com> | 2009-11-19 18:10:23 +0000 |
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committer | David Howells <dhowells@redhat.com> | 2009-11-19 18:10:23 +0000 |
commit | 3d7a641e544e428191667e8b1f83f96fa46dbd65 (patch) | |
tree | 172aa672eca96b94f5531885b82abb82b43c7d8a /Documentation | |
parent | 66b00a7c93ec782d118d2c03bd599cfd041e80a1 (diff) | |
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SLOW_WORK: Wait for outstanding work items belonging to a module to clear
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>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/slow-work.txt | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/Documentation/slow-work.txt b/Documentation/slow-work.txt index ebc50f8..f12fda3 100644 --- a/Documentation/slow-work.txt +++ b/Documentation/slow-work.txt @@ -64,9 +64,11 @@ USING SLOW WORK ITEMS Firstly, a module or subsystem wanting to make use of slow work items must register its interest: - int ret = slow_work_register_user(); + int ret = slow_work_register_user(struct module *module); -This will return 0 if successful, or a -ve error upon failure. +This will return 0 if successful, or a -ve error upon failure. The module +pointer should be the module interested in using this facility (almost +certainly THIS_MODULE). Slow work items may then be set up by: @@ -110,7 +112,12 @@ operation. When all a module's slow work items have been processed, and the module has no further interest in the facility, it should unregister its interest: - slow_work_unregister_user(); + slow_work_unregister_user(struct module *module); + +The module pointer is used to wait for all outstanding work items for that +module before completing the unregistration. This prevents the put_ref() code +from being taken away before it completes. module should almost certainly be +THIS_MODULE. =============== |