soc: qcom: glink: Fix ssr race condition in glink_close

Add else statement in glink_close for a race condition where the
xprt state is set to GLINK_XPRT_DOWN and glink_close runs before
the channel is migrated.

CRs-Fixed: 988266
Change-Id: I4de6530f1fbffd9f3acd1fa539cf756364ea32ac
Signed-off-by: Chris Lew <clew@codeaurora.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/soc/qcom/glink.c b/drivers/soc/qcom/glink.c
index 904953877443..498e45e2dd1b 100644
--- a/drivers/soc/qcom/glink.c
+++ b/drivers/soc/qcom/glink.c
@@ -2631,6 +2631,13 @@ relock: xprt_ctx = ctx->transport_ptr;
 			"channel Not closed yet local state [%d] remote_state [%d]\n",
 			ctx->local_open_state, ctx->remote_opened);
 		}
+	} else {
+		/*
+		 * This case handles the scenario where glink_core_link_down
+		 * changes the local_state to GLINK_XPRT_DOWN but glink_close
+		 * gets the channel write lock before glink_core_channel_cleanup
+		 */
+		rwref_write_put(&ctx->ch_state_lhb2);
 	}
 	complete_all(&ctx->int_req_ack_complete);
 	complete_all(&ctx->int_req_complete);