[PATCH v2] app/testpmd: fix quit testpmd with vfs and pf

[Ke Zhang <ke1x.zhang@intel.com>]

When testpmd startups with pf and vfs,this error occurs when quitting,
results in pf is released before vfs ,so the vf would access an
freed heap memory.

The solution is two steps:
1. Fetch the valid port value from RTE_ETH_FOREACH_DEV.
2. free the port in reverse order.

Fixes: 08fd782b8454 ("app/testpmd: fix quit to stop all ports before close")
Cc: stable@dpdk.org

Signed-off-by: Ke Zhang <ke1x.zhang@intel.com>
---
 app/test-pmd/testpmd.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 04c39adc21..c01ecf7279 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -3492,16 +3492,32 @@ pmd_test_exit(void)
 	}
 #endif
 	if (ports != NULL) {
+		portid_t ethports[RTE_MAX_ETHPORTS];
+		int count = 0;
+		int index = 0;
 		no_link_check = 1;
+
+		/* Fetch the valid port id from port list*/
 		RTE_ETH_FOREACH_DEV(pt_id) {
-			printf("\nStopping port %d...\n", pt_id);
+			ethports[count] = pt_id;
+			count++;
+		}
+
+		/*
+		 * Free the port from Reverse order, as general,
+		 * PF port < VF port， VF should be free before PF
+		 * be free.
+		 */
+		for (index = count - 1 ; index >= 0 ; index--) {
+			printf("\nStopping port %d...\n", ethports[index]);
 			fflush(stdout);
-			stop_port(pt_id);
+			stop_port(ethports[index]);
 		}
-		RTE_ETH_FOREACH_DEV(pt_id) {
-			printf("\nShutting down port %d...\n", pt_id);
+
+		for (index = count - 1 ; index >= 0 ; index--) {
+			printf("\nShutting down port %d...\n", ethports[index]);
 			fflush(stdout);
-			close_port(pt_id);
+			close_port(ethports[index]);
 		}
 	}
 
-- 
2.25.1