On Thu, Sep 17, 2009 at 4:32 PM, Mike Chan <mike@xxxxxxxxxxx> wrote:
> 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 <mike@xxxxxxxxxxx>
> ---
> arch/arm/plat-omap/resource.c | 13 ++++++++-----
> 1 files changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/plat-omap/resource.c b/arch/arm/plat-omap/resource.c
> index 111020a..4631912 100644
> --- a/arch/arm/plat-omap/resource.c
> +++ b/arch/arm/plat-omap/resource.c
> @@ -255,6 +255,7 @@ int resource_refresh(void)
> */
> int resource_register(struct shared_resource *resp)
> {
> + int ret = 0;
> if (!resp)
> return -EINVAL;
>
> @@ -262,12 +263,13 @@ 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);
>
> - down(&res_mutex);
> /* Add the resource to the resource list */
> list_add(&resp->node, &res_list);
>
> @@ -275,10 +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
>
>
Kevin, this should be based off of your pm branch (2.6.30?)
-- Mike
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