[PATCH v6] raw/ifpga: fix pthread cannot join

[Wei Huang <wei.huang@intel.com>]

From: Tianfei Zhang <tianfei.zhang@intel.com>

When we want to close a thread, we should set a flag to notify
thread handler function.

Fixes: 9c006c45 ("raw/ifpga: scan PCIe BDF device tree")
Cc: stable@dpdk.org

Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com>
---
v2: update commit log
---
v3: set thread id to 0 after pthread_join
---
v4: do not evaluate and set pthread_t variable
---
v5: use builtin atomic function to access ifpga_monitor_start flag
---
v6: use __atomic_xxx_n to replace rte_atomicNN_xxx
---
 drivers/raw/ifpga/ifpga_rawdev.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/raw/ifpga/ifpga_rawdev.c b/drivers/raw/ifpga/ifpga_rawdev.c
index 8d9db58..19c2357 100644
--- a/drivers/raw/ifpga/ifpga_rawdev.c
+++ b/drivers/raw/ifpga/ifpga_rawdev.c
@@ -497,7 +497,7 @@ static int set_surprise_link_check_aer(
 	int gsd_enable, ret;
 #define MS 1000
 
-	while (1) {
+	while (__atomic_load_n(&ifpga_monitor_start, __ATOMIC_RELAXED)) {
 		gsd_enable = 0;
 		for (i = 0; i < IFPGA_RAWDEV_NUM; i++) {
 			ifpga_rdev = &ifpga_rawdevices[i];
@@ -525,7 +525,7 @@ static int set_surprise_link_check_aer(
 {
 	int ret;
 
-	if (ifpga_monitor_start == 0) {
+	if (!__atomic_load_n(&ifpga_monitor_start, __ATOMIC_RELAXED)) {
 		ret = rte_ctrl_thread_create(&ifpga_monitor_start_thread,
 					     "ifpga-monitor", NULL,
 					     ifpga_rawdev_gsd_handle, NULL);
@@ -534,7 +534,7 @@ static int set_surprise_link_check_aer(
 				"Fail to create ifpga nonitor thread");
 			return -1;
 		}
-		ifpga_monitor_start = 1;
+		__atomic_store_n(&ifpga_monitor_start, 1, __ATOMIC_RELAXED);
 	}
 
 	return 0;
@@ -544,7 +544,9 @@ static int set_surprise_link_check_aer(
 {
 	int ret;
 
-	if (ifpga_monitor_start == 1) {
+	if (__atomic_load_n(&ifpga_monitor_start, __ATOMIC_RELAXED)) {
+		__atomic_store_n(&ifpga_monitor_start, 0, __ATOMIC_RELAXED);
+
 		ret = pthread_cancel(ifpga_monitor_start_thread);
 		if (ret)
 			IFPGA_RAWDEV_PMD_ERR("Can't cancel the thread");
@@ -553,8 +555,6 @@ static int set_surprise_link_check_aer(
 		if (ret)
 			IFPGA_RAWDEV_PMD_ERR("Can't join the thread");
 
-		ifpga_monitor_start = 0;
-
 		return ret;
 	}
 
-- 
1.8.3.1