diff mbox

PM / Domains: Allocate memory outside domain locks

Message ID 1446067190-42583-1-git-send-email-lina.iyer@linaro.org
State Accepted
Commit 2547923d1cc38b4b55c538e450411586acc39ac6
Headers show

Commit Message

Lina Iyer Oct. 28, 2015, 9:19 p.m. UTC 
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.

Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Krzysztof Kozłowski <k.kozlowski@samsung.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>

Acked-by: Ulf Hansson <ulf.hansson@linaro.org>

Signed-off-by: Lina Iyer <lina.iyer@linaro.org>

---
 drivers/base/power/domain.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

-- 
2.1.4

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diff mbox

Patch

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 6483a92..6f3b145 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1306,13 +1306,17 @@  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);
 
@@ -1322,18 +1326,13 @@  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;
@@ -1344,7 +1343,8 @@  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;
 }
 EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);