diff options
| author | Lina Iyer <lina.iyer@linaro.org> | 2015-10-29 00:19:50 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-11-02 04:26:17 +0300 |
| commit | 2547923d1cc38b4b55c538e450411586acc39ac6 (patch) | |
| tree | 237a3455cf5bd251b0d5c9ea8ecddc93a7edecab /drivers/base | |
| parent | 298cd0f0880188422a518e9d780bd49d66ea7ad5 (diff) | |
| download | linux-2547923d1cc38b4b55c538e450411586acc39ac6.tar.xz | |
PM / Domains: Allocate memory outside domain locks
In preparation for supporting IRQ-safe domains, allocate domain data
outside the domain locks. These functions are not called in an atomic
context, so we can always allocate memory using GFP_KERNEL. By
allocating memory before the locks, we can safely lock the domain using
spinlocks instead of mutexes.
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Lina Iyer <lina.iyer@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/domain.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index e1c017411aeb..f932058b5db6 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1311,13 +1311,17 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd, int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, struct generic_pm_domain *subdomain) { - struct gpd_link *link; + struct gpd_link *link, *itr; int ret = 0; if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) || genpd == subdomain) return -EINVAL; + link = kzalloc(sizeof(*link), GFP_KERNEL); + if (!link) + return -ENOMEM; + mutex_lock(&genpd->lock); mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); @@ -1327,18 +1331,13 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, goto out; } - list_for_each_entry(link, &genpd->master_links, master_node) { - if (link->slave == subdomain && link->master == genpd) { + list_for_each_entry(itr, &genpd->master_links, master_node) { + if (itr->slave == subdomain && itr->master == genpd) { ret = -EINVAL; goto out; } } - link = kzalloc(sizeof(*link), GFP_KERNEL); - if (!link) { - ret = -ENOMEM; - goto out; - } link->master = genpd; list_add_tail(&link->master_node, &genpd->master_links); link->slave = subdomain; @@ -1349,7 +1348,8 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, out: mutex_unlock(&subdomain->lock); mutex_unlock(&genpd->lock); - + if (ret) + kfree(link); return ret; } |