[PATCH v3 6/9] trace: fix race in debug dump

[David Marchand <david.marchand@redhat.com>]

trace->nb_trace_mem_list access must be under trace->lock to avoid
races with threads allocating/freeing their trace buffers.

Fixes: f6b2d65dcd5d ("trace: implement debug dump")
Cc: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
Acked-by: Sunil Kumar Kori <skori@marvell.com>
---
 lib/eal/common/eal_common_trace.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/eal/common/eal_common_trace.c b/lib/eal/common/eal_common_trace.c
index 6aa11a3b50..ec168e37b3 100644
--- a/lib/eal/common/eal_common_trace.c
+++ b/lib/eal/common/eal_common_trace.c
@@ -259,10 +259,9 @@ trace_lcore_mem_dump(FILE *f)
 	struct __rte_trace_header *header;
 	uint32_t count;
 
-	if (trace->nb_trace_mem_list == 0)
-		return;
-
 	rte_spinlock_lock(&trace->lock);
+	if (trace->nb_trace_mem_list == 0)
+		goto out;
 	fprintf(f, "nb_trace_mem_list = %d\n", trace->nb_trace_mem_list);
 	fprintf(f, "\nTrace mem info\n--------------\n");
 	for (count = 0; count < trace->nb_trace_mem_list; count++) {
@@ -273,6 +272,7 @@ trace_lcore_mem_dump(FILE *f)
 		header->stream_header.lcore_id,
 		header->stream_header.thread_name);
 	}
+out:
 	rte_spinlock_unlock(&trace->lock);
 }
 
-- 
2.37.3