linux-kernel - [PATCH next] xen: pcifront: Process failure for pcifront_(re)scan

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Message-ID: <543206CD.1040505@gmail.com>
Date:	Mon, 06 Oct 2014 11:04:45 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	david.vrabel@...rix.com, bhelgaas@...gle.com
CC:	xen-devel@...ts.xenproject.org, linux-pci@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH next] xen: pcifront: Process failure for pcifront_(re)scan_root()

When pcifront_rescan_root() or pcifront_scan_root() fails, need return
error code, neither set XenbusStateConnected state, just like the other
areas have done.

For pcifront_rescan_root(), it will return error code ("num_roots = 0;",
skip xenbus_switch_state return value).

For pcifront_scan_root(), it will return 0 ("num_roots = 0;", set 0 by
the return value of xenbus_switch_state, which always return 0, at
present).

Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
 drivers/pci/xen-pcifront.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 53df39a..d78d884 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -866,6 +866,11 @@ static int pcifront_try_connect(struct pcifront_device *pdev)
 		xenbus_dev_error(pdev->xdev, err,
 				 "No PCI Roots found, trying 0000:00");
 		err = pcifront_scan_root(pdev, 0, 0);
+		if (err) {
+			xenbus_dev_fatal(pdev->xdev, err,
+					 "Error scanning PCI root 0000:00");
+			goto out;
+		}
 		num_roots = 0;
 	} else if (err != 1) {
 		if (err == 0)
@@ -947,6 +952,11 @@ static int pcifront_attach_devices(struct pcifront_device *pdev)
 		xenbus_dev_error(pdev->xdev, err,
 				 "No PCI Roots found, trying 0000:00");
 		err = pcifront_rescan_root(pdev, 0, 0);
+		if (err) {
+			xenbus_dev_fatal(pdev->xdev, err,
+					 "Error scanning PCI root 0000:00");
+			goto out;
+		}
 		num_roots = 0;
 	} else if (err != 1) {
 		if (err == 0)
-- 
1.9.3
--
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