1 files changed, 10 insertions, 92 deletions

diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index fc22e1e6f21..077ae12269c 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -24,7 +24,6 @@
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/uio_driver.h>
-#include <linux/spinlock.h>
 
 #define DRIVER_VERSION	"0.01.0"
 #define DRIVER_AUTHOR	"Michael S. Tsirkin <mst@redhat.com>"
@@ -33,7 +32,6 @@
 struct uio_pci_generic_dev {
 	struct uio_info info;
 	struct pci_dev *pdev;
-	spinlock_t lock; /* guards command register accesses */
 };
 
 static inline struct uio_pci_generic_dev *
@@ -47,82 +45,15 @@ to_uio_pci_generic_dev(struct uio_info *info)
 static irqreturn_t irqhandler(int irq, struct uio_info *info)
 {
 	struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info);
-	struct pci_dev *pdev = gdev->pdev;
-	irqreturn_t ret = IRQ_NONE;
-	u32 cmd_status_dword;
-	u16 origcmd, newcmd, status;
-
-	/* We do a single dword read to retrieve both command and status.
-	 * Document assumptions that make this possible. */
-	BUILD_BUG_ON(PCI_COMMAND % 4);
-	BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS);
-
-	spin_lock_irq(&gdev->lock);
-	pci_block_user_cfg_access(pdev);
-
-	/* Read both command and status registers in a single 32-bit operation.
-	 * Note: we could cache the value for command and move the status read
-	 * out of the lock if there was a way to get notified of user changes
-	 * to command register through sysfs. Should be good for shared irqs. */
-	pci_read_config_dword(pdev, PCI_COMMAND, &cmd_status_dword);
-	origcmd = cmd_status_dword;
-	status = cmd_status_dword >> 16;
-
-	/* Check interrupt status register to see whether our device
-	 * triggered the interrupt. */
-	if (!(status & PCI_STATUS_INTERRUPT))
-		goto done;
-
-	/* We triggered the interrupt, disable it. */
-	newcmd = origcmd | PCI_COMMAND_INTX_DISABLE;
-	if (newcmd != origcmd)
-		pci_write_config_word(pdev, PCI_COMMAND, newcmd);
 
-	/* UIO core will signal the user process. */
-	ret = IRQ_HANDLED;
-done:
-
-	pci_unblock_user_cfg_access(pdev);
-	spin_unlock_irq(&gdev->lock);
-	return ret;
-}
+	if (!pci_check_and_mask_intx(gdev->pdev))
+		return IRQ_NONE;
 
-/* Verify that the device supports Interrupt Disable bit in command register,
- * per PCI 2.3, by flipping this bit and reading it back: this bit was readonly
- * in PCI 2.2. */
-static int __devinit verify_pci_2_3(struct pci_dev *pdev)
-{
-	u16 orig, new;
-	int err = 0;
-
-	pci_block_user_cfg_access(pdev);
-	pci_read_config_word(pdev, PCI_COMMAND, &orig);
-	pci_write_config_word(pdev, PCI_COMMAND,
-			      orig ^ PCI_COMMAND_INTX_DISABLE);
-	pci_read_config_word(pdev, PCI_COMMAND, &new);
-	/* There's no way to protect against
-	 * hardware bugs or detect them reliably, but as long as we know
-	 * what the value should be, let's go ahead and check it. */
-	if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) {
-		err = -EBUSY;
-		dev_err(&pdev->dev, "Command changed from 0x%x to 0x%x: "
-			"driver or HW bug?\n", orig, new);
-		goto err;
-	}
-	if (!((new ^ orig) & PCI_COMMAND_INTX_DISABLE)) {
-		dev_warn(&pdev->dev, "Device does not support "
-			 "disabling interrupts: unable to bind.\n");
-		err = -ENODEV;
-		goto err;
-	}
-	/* Now restore the original value. */
-	pci_write_config_word(pdev, PCI_COMMAND, orig);
-err:
-	pci_unblock_user_cfg_access(pdev);
-	return err;
+	/* UIO core will signal the user process. */
+	return IRQ_HANDLED;
 }
 
-static int __devinit probe(struct pci_dev *pdev,
+static int probe(struct pci_dev *pdev,
 			   const struct pci_device_id *id)
 {
 	struct uio_pci_generic_dev *gdev;
@@ -142,9 +73,10 @@ static int __devinit probe(struct pci_dev *pdev,
 		return -ENODEV;
 	}
 
-	err = verify_pci_2_3(pdev);
-	if (err)
+	if (!pci_intx_mask_supported(pdev)) {
+		err = -ENODEV;
 		goto err_verify;
+	}
 
 	gdev = kzalloc(sizeof(struct uio_pci_generic_dev), GFP_KERNEL);
 	if (!gdev) {
@@ -158,7 +90,6 @@ static int __devinit probe(struct pci_dev *pdev,
 	gdev->info.irq_flags = IRQF_SHARED;
 	gdev->info.handler = irqhandler;
 	gdev->pdev = pdev;
-	spin_lock_init(&gdev->lock);
 
 	if (uio_register_device(&pdev->dev, &gdev->info))
 		goto err_register;
@@ -182,27 +113,14 @@ static void remove(struct pci_dev *pdev)
 	kfree(gdev);
 }
 
-static struct pci_driver driver = {
+static struct pci_driver uio_pci_driver = {
 	.name = "uio_pci_generic",
 	.id_table = NULL, /* only dynamic id's */
 	.probe = probe,
 	.remove = remove,
 };
 
-static int __init init(void)
-{
-	pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
-	return pci_register_driver(&driver);
-}
-
-static void __exit cleanup(void)
-{
-	pci_unregister_driver(&driver);
-}
-
-module_init(init);
-module_exit(cleanup);
-
+module_pci_driver(uio_pci_driver);
 MODULE_VERSION(DRIVER_VERSION);
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR(DRIVER_AUTHOR);