On Tue, Sep 8, 2009 at 3:39 PM, Kevin Hilman<khil...@deeprootsystems.com> wrote:
> Mike Chan <m...@android.com> writes:
>
>> Checking if the resource is already registered and adding to the list
>> must be atomic or bad things can happen.
>>
>> Signed-off-by: Mike Chan <m...@android.com>
>
> Functionally, this looks fine. Some procedural details still to work
> out:
>
> Are you the original author of this? or was it Chunqiu or Limei? The
> changelog should be prefixed with a From: line of the original author
> (handled by git-format-patch) if it was not you. Also add the other's
> signoffs if appropriate.
>
I am the original author of this patch. Chunqiu sent two patches out
1) a per-resource level mutex (vs global).
2) Make update_resource_level() thread safe.
I've been meaning to send them out to l-o on behalf of Chunqiu.
> What tree does this apply to? It's not specified, and does not apply
> to either current PM branch or pm-2.6.29.
>
I thought I rebased this off of pm but I may have goofed. I can send a new one.
-- Mike
> Kevin
>
>> ---
>> arch/arm/plat-omap/resource.c | 14 +++++++++-----
>> 1 files changed, 9 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/arm/plat-omap/resource.c b/arch/arm/plat-omap/resource.c
>> index e9ace13..9d20249 100644
>> --- a/arch/arm/plat-omap/resource.c
>> +++ b/arch/arm/plat-omap/resource.c
>> @@ -253,6 +253,7 @@ int resource_refresh(void)
>> */
>> int resource_register(struct shared_resource *resp)
>> {
>> + int ret = 0;
>> if (!resp)
>> return -EINVAL;
>>
>> @@ -260,13 +261,15 @@ int resource_register(struct shared_resource *resp)
>> return -EINVAL;
>>
>> /* Verify that the resource is not already registered */
>> - if (resource_lookup(resp->name))
>> - return -EEXIST;
>> + down(&res_mutex);
>> + if (_resource_lookup(resp->name)) {
>> + ret = -EEXIST;
>> + goto out;
>> + }
>>
>> INIT_LIST_HEAD(&resp->users_list);
>> mutex_init(&resp->resource_mutex);
>>
>> - down(&res_mutex);
>> /* Add the resource to the resource list */
>> list_add(&resp->node, &res_list);
>>
>> @@ -274,10 +277,11 @@ int resource_register(struct shared_resource *resp)
>> if (resp->ops->init)
>> resp->ops->init(resp);
>>
>> - up(&res_mutex);
>> pr_debug("resource: registered %s\n", resp->name);
>>
>> - return 0;
>> +out:
>> + up(&res_mutex);
>> + return ret;
>> }
>> EXPORT_SYMBOL(resource_register);
>>
>> --
>> 1.5.4.5
>
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