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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2012-11-23 20:55:06 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-12-03 11:38:01 -0800
commitdc541b2ba0e0aa83831ca99ba1e5a574e41d3c5b (patch)
tree3cf9402f0bb2c946b2ed17c855101e30d1547af1
parentcbda50306446b3f359bbf2874a99979990b0627c (diff)
downloadlinux-linaro-stable-dc541b2ba0e0aa83831ca99ba1e5a574e41d3c5b.tar.gz
PM / QoS: fix wrong error-checking condition
commit a7227a0faa117d0bc532aea546ae5ac5f89e8ed7 upstream. dev_pm_qos_add_request() can return 0, 1, or a negative error code, therefore the correct error test is "if (error < 0)." Checking just for non-zero return code leads to erroneous setting of the req->dev pointer to NULL, which then leads to a repeated call to dev_pm_qos_add_ancestor_request() in st1232_ts_irq_handler(). This in turn leads to an Oops, when the I2C host adapter is unloaded and reloaded again because of the inconsistent state of its QoS request list. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/base/power/qos.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index 74a67e0019a2..fbbd4ed2edf2 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -451,7 +451,7 @@ int dev_pm_qos_add_ancestor_request(struct device *dev,
if (ancestor)
error = dev_pm_qos_add_request(ancestor, req, value);
- if (error)
+ if (error < 0)
req->dev = NULL;
return error;