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authorAlan Stern <stern@rowland.harvard.edu>2009-12-13 22:28:30 +0300
committerRafael J. Wysocki <rjw@sisk.pl>2009-12-15 22:42:06 +0300
commit1d531c14d2ed4b24472a4d773f00ed6d1cd34ee7 (patch)
treea61fd40d1104c9a02e15baa4496c11e148f20804 /drivers/base
parent8bea8672edfca7ec5f661cafb218f1205863b343 (diff)
downloadlinux-1d531c14d2ed4b24472a4d773f00ed6d1cd34ee7.tar.xz
PM: allow for usage_count > 0 in pm_runtime_get()
This patch (as1308c) fixes __pm_runtime_get(). Currently the routine will resume a device if the prior usage count was 0. But this isn't right; thanks to pm_runtime_get_noresume() the usage count can be positive even while the device is suspended. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/runtime.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 5a01ecef4af3..40d7720a4b21 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -701,15 +701,15 @@ EXPORT_SYMBOL_GPL(pm_request_resume);
* @dev: Device to handle.
* @sync: If set and the device is suspended, resume it synchronously.
*
- * Increment the usage count of the device and if it was zero previously,
- * resume it or submit a resume request for it, depending on the value of @sync.
+ * Increment the usage count of the device and resume it or submit a resume
+ * request for it, depending on the value of @sync.
*/
int __pm_runtime_get(struct device *dev, bool sync)
{
- int retval = 1;
+ int retval;
- if (atomic_add_return(1, &dev->power.usage_count) == 1)
- retval = sync ? pm_runtime_resume(dev) : pm_request_resume(dev);
+ atomic_inc(&dev->power.usage_count);
+ retval = sync ? pm_runtime_resume(dev) : pm_request_resume(dev);
return retval;
}