diff options
Diffstat (limited to 'lib/librte_eal/linuxapp/igb_uio/igb_uio.c')
| -rw-r--r-- | lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 18 |
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); |