[PATCH 10/12] drm/amdkfd: Locking PM mutex while allocating IB buffer

[Felix Kuehling]

From: Ben Goz <ben.goz at amd.com>

Signed-off-by: Ben Goz <ben.goz at amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
index 91f0350..c317feb4 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
@@ -94,12 +94,14 @@ static int pm_allocate_runlist_ib(struct packet_manager *pm,
 
 	pm_calc_rlib_size(pm, rl_buffer_size, is_over_subscription);
 
+	mutex_lock(&pm->lock);
+
 	retval = kfd_gtt_sa_allocate(pm->dqm->dev, *rl_buffer_size,
 					&pm->ib_buffer_obj);
 
 	if (retval) {
 		pr_err("Failed to allocate runlist IB\n");
-		return retval;
+		goto out;
 	}
 
 	*(void **)rl_buffer = pm->ib_buffer_obj->cpu_ptr;
@@ -107,6 +109,9 @@ static int pm_allocate_runlist_ib(struct packet_manager *pm,
 
 	memset(*rl_buffer, 0, *rl_buffer_size);
 	pm->allocated = true;
+
+out:
+	mutex_unlock(&pm->lock);
 	return retval;
 }
 
-- 
2.7.4