+// SPDX-License-Identifier: GPL-2.0
/*-
- * GPL LICENSE SUMMARY
- *
- * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- * The full GNU General Public License is included in this distribution
- * in the file called LICENSE.GPL.
- *
- * Contact Information:
- * Intel Corporation
+ * Copyright(c) 2010-2017 Intel Corporation. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
struct uio_info info;
struct pci_dev *pdev;
enum rte_intr_mode mode;
+ struct mutex lock;
+ int refcnt;
};
static char *intr_mode;
err = request_irq(udev->info.irq, igbuio_pci_irqhandler,
udev->info.irq_flags, udev->info.name,
udev);
- dev_info(&udev->pdev->dev, "uio device registered with irq %lx\n",
+ dev_info(&udev->pdev->dev, "uio device registered with irq %ld\n",
udev->info.irq);
return err;
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;
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;
}
if (!udev)
return -ENOMEM;
+ mutex_init(&udev->lock);
/*
* enable device: ask low-level code to enable I/O and
* memory
{
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);