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Commit 6450a9e0 authored by Pankaj Gupta's avatar Pankaj Gupta
Browse files

msm: kgsl: Use worker to put refcount on mem entry 



If refcount on mem entry is the last refcount, we will call
kgsl_mem_entry_destroy and detach it from process list. If
there is no refcount on the process private as well then we
will call kgsl_destroy_process_private to cleanup. During
cleanup, we will try to remove the same sysfs node which is
in use by the current thread and this situation will end up in
a deadlock.
To fix this problem, use a worker to put the refcount on mem
entry.

Change-Id: I69a77c4059489c95de2ca205701571daac4bdc8a
Signed-off-by: default avatarPankaj Gupta <gpankaj@codeaurora.org>
parent 1c2af547

drivers/gpu/msm/kgsl_sharedmem.c

+12 −1
Original line number Diff line number Diff line
@@ -171,7 +171,18 @@ imported_mem_show(struct kgsl_process_private *priv, 
			}

		}



		kgsl_mem_entry_put(entry);

		/*

		 * If refcount on mem entry is the last refcount, we will

		 * call kgsl_mem_entry_destroy and detach it from process

		 * list. When there is no refcount on the process private,

		 * we will call kgsl_destroy_process_private to do cleanup.

		 * During cleanup, we will try to remove the same sysfs

		 * node which is in use by the current thread and this

		 * situation will end up in a deadloack.

		 * To avoid this situation, use a worker to put the refcount

		 * on mem entry.

		 */

		kgsl_mem_entry_put_deferred(entry);

		spin_lock(&priv->mem_lock);

	}

	spin_unlock(&priv->mem_lock);