[PATCH V2 2/8] accel/amdxdna: Replace mmput with mmput_async to avoid dead lock

[Lizhi Hou]

Hardware mailbox message receiving handler calls mmput to release the
process mm. If the process has already exited, the mmput here may call mmu
notifier handler, amdxdna_hmm_invalidate, which will cause a dead lock.
Using mmput_async instead prevents this dead lock.

Fixes: aac243092b70 ("accel/amdxdna: Add command execution")
Signed-off-by: Lizhi Hou <lizhi....@amd.com>
---
 drivers/accel/amdxdna/aie2_ctx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/accel/amdxdna/aie2_ctx.c b/drivers/accel/amdxdna/aie2_ctx.c
index 90e8d87666a9..b5282555bbf2 100644
--- a/drivers/accel/amdxdna/aie2_ctx.c
+++ b/drivers/accel/amdxdna/aie2_ctx.c
@@ -179,7 +179,7 @@ aie2_sched_notify(struct amdxdna_sched_job *job)
        up(&job->hwctx->priv->job_sem);
        job->job_done = true;
        dma_fence_put(fence);
-       mmput(job->mm);
+       mmput_async(job->mm);
        aie2_job_put(job);
 }
 
-- 
2.34.1