[PATCH v2 2/2] bus/pci: fix secondary process save 'FD' problem

[Chaoyong He]

From: Zerun Fu <zerun.fu at corigine.com>

In the previous logic the 'fd' was only saved in the primary process,
but for some devices this value is also used in the secondary logic.

For example, the call of 'rte_pci_find_ext_capability()' will fail in
the secondary process.

Fix this problem by getting and saving the value of 'fd' also in the
secondary process logic.

Fixes: 9b957f378abf ("pci: merge uio functions for linux and bsd")
Cc: mukawa at igel.co.jp
Cc: stable at dpdk.org

Signed-off-by: Zerun Fu <zerun.fu at corigine.com>
Reviewed-by: Chaoyong He <chaoyong.he at corigine.com>
Reviewed-by: Long Wu <long.wu at corigine.com>
Reviewed-by: Peng Zhang <peng.zhang at corigine.com>
---
 drivers/bus/pci/linux/pci_uio.c  | 5 ++++-
 drivers/bus/pci/pci_common_uio.c | 8 ++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/bus/pci/linux/pci_uio.c b/drivers/bus/pci/linux/pci_uio.c
index 97d740dfe5..6680e42efb 100644
--- a/drivers/bus/pci/linux/pci_uio.c
+++ b/drivers/bus/pci/linux/pci_uio.c
@@ -237,7 +237,7 @@ pci_uio_alloc_resource(struct rte_pci_device *dev,
 	}
 	snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
 
-	/* save fd if in primary process */
+	/* save fd */
 	fd = open(devname, O_RDWR);
 	if (fd < 0) {
 		RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
@@ -261,6 +261,9 @@ pci_uio_alloc_resource(struct rte_pci_device *dev,
 	if (rte_intr_dev_fd_set(dev->intr_handle, uio_cfg_fd))
 		goto error;
 
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return 0;
+
 	if (dev->kdrv == RTE_PCI_KDRV_IGB_UIO) {
 		if (rte_intr_type_set(dev->intr_handle, RTE_INTR_HANDLE_UIO))
 			goto error;
diff --git a/drivers/bus/pci/pci_common_uio.c b/drivers/bus/pci/pci_common_uio.c
index fcd8a49daf..b6f79b067d 100644
--- a/drivers/bus/pci/pci_common_uio.c
+++ b/drivers/bus/pci/pci_common_uio.c
@@ -122,15 +122,15 @@ pci_uio_map_resource(struct rte_pci_device *dev)
 	if (rte_intr_dev_fd_set(dev->intr_handle, -1))
 		return -1;
 
-	/* secondary processes - use already recorded details */
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
-		return pci_uio_map_secondary(dev);
-
 	/* allocate uio resource */
 	ret = pci_uio_alloc_resource(dev, &uio_res);
 	if (ret)
 		return ret;
 
+	/* secondary processes - use already recorded details */
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return pci_uio_map_secondary(dev);
+
 	/* Map all BARs */
 	for (i = 0; i != PCI_MAX_RESOURCE; i++) {
 		/* skip empty BAR */
-- 
2.39.1