X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=lib%2Flibrte_eal%2Flinuxapp%2Figb_uio%2Figb_uio.c;h=45d70272df7158701cf60ee061660cc3f258c2f2;hb=refs%2Fheads%2Fupstream-17.11-stable;hp=a3a98c1730890eb7e726889b2c83ecc6771426dd;hpb=055c52583a2794da8ba1e85a48cce3832372b12f;p=deb_dpdk.git

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index a3a98c17..45d70272 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -45,6 +45,7 @@ struct rte_uio_pci_dev {
 	struct uio_info info;
 	struct pci_dev *pdev;
 	enum rte_intr_mode mode;
+	atomic_t refcnt;
 };
 
 static char *intr_mode;
@@ -336,16 +337,19 @@ igbuio_pci_open(struct uio_info *info, struct inode *inode)
 	struct pci_dev *dev = udev->pdev;
 	int err;
 
+	if (atomic_inc_return(&udev->refcnt) != 1)
+		return 0;
+
 	/* set bus master, which was cleared by the reset function */
 	pci_set_master(dev);
 
 	/* enable interrupts */
 	err = igbuio_pci_enable_interrupts(udev);
 	if (err) {
+		atomic_dec(&udev->refcnt);
 		dev_err(&dev->dev, "Enable interrupt fails\n");
-		return err;
 	}
-	return 0;
+	return err;
 }
 
 static int
@@ -354,11 +358,13 @@ igbuio_pci_release(struct uio_info *info, struct inode *inode)
 	struct rte_uio_pci_dev *udev = info->priv;
 	struct pci_dev *dev = udev->pdev;
 
-	/* disable interrupts */
-	igbuio_pci_disable_interrupts(udev);
+	if (atomic_dec_and_test(&udev->refcnt)) {
+		/* disable interrupts */
+		igbuio_pci_disable_interrupts(udev);
 
-	/* stop the device from further DMA */
-	pci_clear_master(dev);
+		/* stop the device from further DMA */
+		pci_clear_master(dev);
+	}
 
 	return 0;
 }
@@ -519,6 +525,7 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	udev->info.release = igbuio_pci_release;
 	udev->info.priv = udev;
 	udev->pdev = dev;
+	atomic_set(&udev->refcnt, 0);
 
 	err = sysfs_create_group(&dev->dev.kobj, &dev_attr_grp);
 	if (err != 0)