msm: mhi_dev: Update sequence when ipa_mhi_destroy is issued

Currently ipa_mhi_destroy() is issued during MHI device reset.
There could be a condition where the switch to M0 event is
in progress while the MHI device reset is received. Calling
ipa_mhi_destroy() followed by processing the M0 transition
causes IPA to assert since ipa_mhi_destroy() was already
issued. Therefore flush the workqueue that is processing
the switch to M0 transition before calling ipa_mhi_destroy().

Change-Id: I298fdc67cb5d660ba8b722016a0b4d9deb32142a
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>

drivers/platform/msm/mhi_dev/mhi.c

@@ -1686,9 +1686,6 @@ static int mhi_dev_abort(struct mhi_dev *mhi)
 	flush_workqueue(mhi->ring_init_wq);
 	flush_workqueue(mhi->pending_ring_wq);
 
-	/* Initiate MHI IPA reset */
-	ipa_mhi_destroy();
-
 	/* Clean up initialized channels */
 	rc = mhi_deinit(mhi);
 	if (rc) {

drivers/platform/msm/mhi_dev/mhi_sm.c

@@ -968,6 +968,8 @@ int mhi_dev_sm_exit(struct mhi_dev *mhi_dev)
 	mhi_sm_debugfs_destroy();
 	flush_workqueue(mhi_sm_ctx->mhi_sm_wq);
 	destroy_workqueue(mhi_sm_ctx->mhi_sm_wq);
+	/* Initiate MHI IPA reset */
+	ipa_mhi_destroy();
 	ipa_dma_destroy();
 	mutex_destroy(&mhi_sm_ctx->mhi_state_lock);
 	devm_kfree(mhi_dev->dev, mhi_sm_ctx);