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Commit 0d06bb1c authored Feb 24, 2017 by Skylar Chang

msm: ipa3: fix a race condition on clock vote from suspend



There is a potential race condition where suspend interrupt
handling might be running from two different context in parallel.
Add a mutex to ensure mutual exclusion when voting for IPA clocks.

CRs-Fixed: 2037199
Change-Id: I7f14866696b6c9f5e239f3de2c4bad6991097ecb
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>

parent ed98af78

drivers/platform/msm/ipa/ipa_v2/ipa.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -3679,6 +3679,7 @@ void ipa_suspend_handler(enum ipa_irq_type interrupt,
		* pipe will be unsuspended as part of
		* enabling IPA clocks
		*/
		mutex_lock(&ipa_ctx->sps_pm.sps_pm_lock);
		if (!atomic_read(
		&ipa_ctx->sps_pm.dec_clients)
		) {
		@@ -3691,6 +3692,7 @@ void ipa_suspend_handler(enum ipa_irq_type interrupt,
		1);
		ipa_sps_process_irq_schedule_rel();
		}
		mutex_unlock(&ipa_ctx->sps_pm.sps_pm_lock);
		} else {
		resource = ipa2_get_rm_resource_from_ep(i);
		res = ipa_rm_request_resource_with_timer(

drivers/platform/msm/ipa/ipa_v3/ipa.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -3620,6 +3620,8 @@ void ipa3_suspend_handler(enum ipa_irq_type interrupt,
		* pipe will be unsuspended as part of
		* enabling IPA clocks
		*/
		mutex_lock(&ipa3_ctx->transport_pm.
		transport_pm_mutex);
		if (!atomic_read(
		&ipa3_ctx->transport_pm.dec_clients)
		) {
		@@ -3632,6 +3634,8 @@ void ipa3_suspend_handler(enum ipa_irq_type interrupt,
		1);
		ipa3_process_irq_schedule_rel();
		}
		mutex_unlock(&ipa3_ctx->transport_pm.
		transport_pm_mutex);
		} else {
		resource = ipa3_get_rm_resource_from_ep(i);
		res =