[PATCH 2/4 v2] i2c-i801: Fallback to polling if request_irq() fails

[Jean Delvare <jdelvare-l3A5Bk7waGM@public.gmane.org>]

The i2c-i801 driver can work without interrupts, so there is no reason
to make a request_irq failure fatal. Instead we can simply fallback
to polling.

Signed-off-by: Jean Delvare <jdelvare-l3A5Bk7waGM@public.gmane.org>
Cc: Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
---
Changes since v1:
 * Always log whether the driver is using polling or PCI interrupt.

 drivers/i2c/busses/i2c-i801.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- linux-3.18-rc4.orig/drivers/i2c/busses/i2c-i801.c	2014-11-10 22:29:42.788955868 +0100
+++ linux-3.18-rc4/drivers/i2c/busses/i2c-i801.c	2014-11-11 14:56:35.777941563 +0100
@@ -1242,10 +1242,11 @@ static int i801_probe(struct pci_dev *de
 		if (err) {
 			dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
 				dev->irq, err);
-			goto exit_release;
+			priv->features &= ~FEATURE_IRQ;
 		}
-		dev_info(&dev->dev, "SMBus using PCI Interrupt\n");
 	}
+	dev_info(&dev->dev, "SMBus using %s\n",
+		 priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
 
 	/* set up the sysfs linkage to our parent device */
 	priv->adapter.dev.parent = &dev->dev;
@@ -1272,7 +1273,6 @@ static int i801_probe(struct pci_dev *de
 exit_free_irq:
 	if (priv->features & FEATURE_IRQ)
 		free_irq(dev->irq, priv);
-exit_release:
 	pci_release_region(dev, SMBBAR);
 exit:
 	kfree(priv);

-- 
Jean Delvare
SUSE L3 Support