Messages in this thread Patch in this message | | | Date | Fri, 25 Jan 2013 10:08:24 +0000 | Subject | Re: [PATCH 4/4] async: replace list of active domains with global list of pending items | From | James Hogan <> |
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On 25 January 2013 01:01, Tejun Heo <tj@kernel.org> wrote: > Hello, > > On Fri, Jan 25, 2013 at 12:13:45AM +0000, James Hogan wrote: >> Should it have this? >> + else >> + INIT_LIST_HEAD(&entry->global_list) > > I think it would be better to have INIT_LIST_HEAD() during @entry > initialization. Heh, I forgot that. I wonder why it didn't crash on > my machine. Can you please cook up a patch to init both list fields > right after kzalloc()?
How does the following patch look? Feel free to squash it into the original to avoid breaking bisection :).
Cheers James
From: James Hogan <james.hogan@imgtec.com> Date: Fri, 25 Jan 2013 09:46:58 +0000 Subject: [PATCH 1/1] async: initialise list heads to fix crash
The commit "async: replace list of active domains with global list of pending items" added a struct list_head global_list in struct async_entry, which isn't initialised. This means that if !domain->registered at __async_schedule(), then list_del_init() will be called on the list head in async_run_entry_fn with both pointers NULL, causing a crash. This is fixed by initialising both the global_list and domain_list list_heads after kzalloc'ing the entry.
This was noticed due to dapm_power_widgets() which uses ASYNC_DOMAIN_EXCLUSIVE, which initialises the domain->registered to 0.
Signed-off-by: James Hogan <james.hogan@imgtec.com> --- kernel/async.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/kernel/async.c b/kernel/async.c index 6958000..8ddee2c 100644 --- a/kernel/async.c +++ b/kernel/async.c @@ -172,6 +172,8 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct a ptr(data, newcookie); return newcookie; } + INIT_LIST_HEAD(&entry->domain_list); + INIT_LIST_HEAD(&entry->global_list); INIT_WORK(&entry->work, async_run_entry_fn); entry->func = ptr; entry->data = data; -- 1.7.7.6
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