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authorAlan Stern <stern@rowland.harvard.edu>2009-06-29 11:00:01 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-23 06:46:23 -0700
commitccf5b801cef4f9e2d708d3b87e91e2bc6abd5206 (patch)
tree1b7de13df336f44f6f74657934e79dc8c0bfd142 /include
parent7cbe5dca399a50ce8aa74314b1d276e2fb904e1b (diff)
USB: make intf.pm_usage an atomic_t
This patch (as1260) changes the pm_usage_cnt field in struct usb_interface from an int to an atomic_t. This is so that drivers can invoke the usb_autopm_get_interface_async() and usb_autopm_put_interface_async() routines without locking and without fear of corrupting the pm_usage_cnt value. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/usb.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 3b45a0d27b8..a34fa89f147 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -195,7 +195,7 @@ struct usb_interface {
struct device dev; /* interface specific device info */
struct device *usb_dev;
- int pm_usage_cnt; /* usage counter for autosuspend */
+ atomic_t pm_usage_cnt; /* usage counter for autosuspend */
struct work_struct reset_ws; /* for resets in atomic context */
};
#define to_usb_interface(d) container_of(d, struct usb_interface, dev)
@@ -551,13 +551,13 @@ extern void usb_autopm_put_interface_async(struct usb_interface *intf);
static inline void usb_autopm_enable(struct usb_interface *intf)
{
- intf->pm_usage_cnt = 0;
+ atomic_set(&intf->pm_usage_cnt, 0);
usb_autopm_set_interface(intf);
}
static inline void usb_autopm_disable(struct usb_interface *intf)
{
- intf->pm_usage_cnt = 1;
+ atomic_set(&intf->pm_usage_cnt, 1);
usb_autopm_set_interface(intf);
}