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Diffstat (limited to 'lib/librte_eal/linuxapp/igb_uio/igb_uio.c')
-rw-r--r--lib/librte_eal/linuxapp/igb_uio/igb_uio.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index a3a98c17..1826adba 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -45,6 +45,8 @@ struct rte_uio_pci_dev {
struct uio_info info;
struct pci_dev *pdev;
enum rte_intr_mode mode;
+ struct mutex lock;
+ int refcnt;
};
static char *intr_mode;
@@ -336,11 +338,18 @@ igbuio_pci_open(struct uio_info *info, struct inode *inode)
struct pci_dev *dev = udev->pdev;
int err;
+ mutex_lock(&udev->lock);
+ if (++udev->refcnt > 1) {
+ mutex_unlock(&udev->lock);
+ return 0;
+ }
+
/* set bus master, which was cleared by the reset function */
pci_set_master(dev);
/* enable interrupts */
err = igbuio_pci_enable_interrupts(udev);
+ mutex_unlock(&udev->lock);
if (err) {
dev_err(&dev->dev, "Enable interrupt fails\n");
return err;
@@ -354,12 +363,19 @@ igbuio_pci_release(struct uio_info *info, struct inode *inode)
struct rte_uio_pci_dev *udev = info->priv;
struct pci_dev *dev = udev->pdev;
+ mutex_lock(&udev->lock);
+ if (--udev->refcnt > 0) {
+ mutex_unlock(&udev->lock);
+ return 0;
+ }
+
/* disable interrupts */
igbuio_pci_disable_interrupts(udev);
/* stop the device from further DMA */
pci_clear_master(dev);
+ mutex_unlock(&udev->lock);
return 0;
}
@@ -480,6 +496,7 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
if (!udev)
return -ENOMEM;
+ mutex_init(&udev->lock);
/*
* enable device: ask low-level code to enable I/O and
* memory
@@ -570,6 +587,7 @@ igbuio_pci_remove(struct pci_dev *dev)
{
struct rte_uio_pci_dev *udev = pci_get_drvdata(dev);
+ mutex_destroy(&udev->lock);
sysfs_remove_group(&dev->dev.kobj, &dev_attr_grp);
uio_unregister_device(&udev->info);
igbuio_pci_release_iomem(&udev->info);