From: Lizhi Hou <lizhi.hou@amd.com>
Date: Fri, 6 Dec 2024 21:59:55 +0000 (-0800)
Subject: accel/amdxdna: Replace mmput with mmput_async to avoid dead lock
X-Git-Tag: v6.14-rc1~174^2~13^2~60
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=cfc722fc1c72e415d5f473affcdb3f3f556233f6;p=thirdparty%2Fkernel%2Flinux.git

accel/amdxdna: Replace mmput with mmput_async to avoid dead lock

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.hou@amd.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241206220001.164049-3-lizhi.hou@amd.com
---

diff --git a/drivers/accel/amdxdna/aie2_ctx.c b/drivers/accel/amdxdna/aie2_ctx.c
index 90e8d87666a92..b5282555bbf21 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);
 }