[PATCH v2] pci: fix check uio bind

[Jianfeng Tan <jianfeng.tan@intel.com>]

When checking if any devices bound to uio, we did not exclud
those which are blacklisted (or in the case that a whitelist
is specified).

This patch fixes it by only checking whitelisted devices, or
not-blacklisted devices depending on the bus scan mode.

Fixes: 815c7deaed2d ("pci: get IOMMU class on Linux")

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
v2:
  - Accept two suggestions from Gaetan.

 lib/librte_eal/linuxapp/eal/eal_pci.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index b4dbf95..4d1de07 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -516,8 +516,29 @@ static inline int
 pci_one_device_bound_uio(void)
 {
 	struct rte_pci_device *dev = NULL;
+	struct rte_devargs *devargs;
+	int need_check;
 
 	FOREACH_DEVICE_ON_PCIBUS(dev) {
+		devargs = dev->device.devargs;
+
+		need_check = 0;
+		switch (rte_pci_bus.bus.conf.scan_mode) {
+		case RTE_BUS_SCAN_WHITELIST:
+			if (devargs && devargs->policy == RTE_DEV_WHITELISTED)
+				need_check = 1;
+			break;
+		case RTE_BUS_SCAN_UNDEFINED:
+		case RTE_BUS_SCAN_BLACKLIST:
+			if (devargs == NULL ||
+			    devargs->policy != RTE_DEV_BLACKLISTED)
+				need_check = 1;
+			break;
+		}
+
+		if (!need_check)
+			continue;
+
 		if (dev->kdrv == RTE_KDRV_IGB_UIO ||
 		   dev->kdrv == RTE_KDRV_UIO_GENERIC) {
 			return 1;
-- 
2.7.4