diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2009-06-29 11:00:01 -0400 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2009-07-20 10:16:33 +1000 |
| commit | c14b578b8619a0b6e518fa868fcb08332f821159 (patch) | |
| tree | 399d822c9773d4bf6038d11bf6e57af63f765ec8 /include | |
| parent | da1a70fec90c940a7dfbd3dcfa3eff72c40337c5 (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.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index daa39caa92dc..904ff86a27b0 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); } |