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

[Wei Huang]

From: Tianfei Zhang <tianfei.zh...@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: sta...@dpdk.org

Signed-off-by: Tianfei Zhang <tianfei.zh...@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