linux-kernel - [PATCH 1/1] Staging: hv: vmbus: Don't wait indefinitely for IRQ resouces

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Date:	Fri, 15 Jul 2011 13:38:56 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [PATCH 1/1] Staging: hv: vmbus: Don't wait indefinitely for IRQ resouces

If an attempt is made to load the vmbus driver on a non-Hyper-V platform,
the load operation will hang since we currently wait indefinitely to 
retrieve the IRQ information. This is done in the context of an acpi callback
context (which will obviously not happen when this driver is
loaded on a non-Hyper-V platform). This patch fixes the problem. 

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/staging/hv/vmbus_drv.c |   19 ++++++++++++++-----
 1 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
index 433be51..b382829 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -702,7 +702,7 @@ static struct acpi_driver vmbus_acpi_driver = {
 
 static int __init hv_acpi_init(void)
 {
-	int ret;
+	int ret, t;
 
 	init_completion(&probe_event);
 
@@ -715,16 +715,25 @@ static int __init hv_acpi_init(void)
 	if (ret)
 		return ret;
 
-	wait_for_completion(&probe_event);
+	t = wait_for_completion_timeout(&probe_event, 5*HZ);
+	if (t == 0) {
+		ret = -ETIMEDOUT;
+		goto cleanup;
+	}
 
 	if (irq <= 0) {
-		acpi_bus_unregister_driver(&vmbus_acpi_driver);
-		return -ENODEV;
+		ret = -ENODEV;
+		goto cleanup;
 	}
 
 	ret = vmbus_bus_init(irq);
 	if (ret)
-		acpi_bus_unregister_driver(&vmbus_acpi_driver);
+		goto cleanup;
+
+	return 0;
+
+cleanup:
+	acpi_bus_unregister_driver(&vmbus_acpi_driver);
 	return ret;
 }
 
-- 
1.7.4.1

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