In secondary process, rte_eth_dev_close() doesn't clear eth_dev->data.
If calling rte_dev_remove() after rte_eth_dev_close(),
in rte_eth_dev_pci_generic_remove() function, the released eth device still
can be found by its name in shared memory. As a result, the eth device will
be released repeatedly. The state of the eth device is modified to
RTE_ETH_DEV_UNUSED after rte_eth_dev_close(). So this state can be used to
avoid this problem.

Fixes: dcd5c8112bc3 ("ethdev: add PCI driver helpers")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
---
v4:
 * add fixes line and stable tag.
v3:
 * fix the commit log description and the comment inside the code.
v2:                                                                  
  * fix the commit log description.   
v1:                                                                 
  * fix commit log and add a judgment for secondary process.
---
 lib/ethdev/ethdev_pci.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/ethdev/ethdev_pci.h b/lib/ethdev/ethdev_pci.h
index 8edca82ce8..fcabae02fa 100644
--- a/lib/ethdev/ethdev_pci.h
+++ b/lib/ethdev/ethdev_pci.h

@@ -151,6 +151,16 @@ rte_eth_dev_pci_generic_remove(struct rte_pci_device *pci_dev,
 	if (!eth_dev)
 		return 0;
 
+	/*
+	 * In secondary process, a released eth device can be found by its name
+	 * in shared memory.
+	 * If the state of the eth device is RTE_ETH_DEV_UNUSED, it means the
+	 * eth device has been released.
+	 */
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
+	    eth_dev->state == RTE_ETH_DEV_UNUSED)
+		return 0;
+
 	if (dev_uninit) {
 		ret = dev_uninit(eth_dev);
 		if (ret)

-- 
2.33.0