[PATCH] lib: sbi: Put event after use in sbi_sse_exit() loop

[Anup Patel]

Currently, the sbi_sse_exit() gets event in a loop but does not put
it back after use. This results in global events remaining locked
causing hangs on sub-sequent calls to sse_event_get() for global
events.

Fixes: c8cdf01d8f3a ("lib: sbi: Add support for Supervisor Software Events extension")
Signed-off-by: Anup Patel <apatel at ventanamicro.com>
---
 lib/sbi/sbi_sse.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/sbi/sbi_sse.c b/lib/sbi/sbi_sse.c
index 18dfdb6..0cd6ba6 100644
--- a/lib/sbi/sbi_sse.c
+++ b/lib/sbi/sbi_sse.c
@@ -1121,13 +1121,18 @@ void sbi_sse_exit(struct sbi_scratch *scratch)
 
 	for (i = 0; i < EVENT_COUNT; i++) {
 		e = sse_event_get(supported_events[i]);
-
-		if (!e || e->attrs.hartid != current_hartid())
+		if (!e)
 			continue;
 
+		if (e->attrs.hartid != current_hartid())
+			goto skip;
+
 		if (sse_event_state(e) > SBI_SSE_STATE_REGISTERED) {
 			sbi_printf("Event %d in invalid state at exit", i);
 			sse_event_set_state(e, SBI_SSE_STATE_UNUSED);
 		}
+
+skip:
+		sse_event_put(e);
 	}
 }
-- 
2.34.1