On Tue, May 26, 2015 at 10:19:57AM +0800, Zhang, Yanmin wrote: > Some usb driver has a specific requirement. Their critical functions > > might be called under both atomic environment and non-atomic environment. > > If it's under atomic environment, the driver can wake up the device > > by calling pm_runtime_get_sync directly. > > If it's under non-atomic environment, the function's caller need wake > > up the device before the function accesses the device. > > The patch adds usb_autopm_get_interface_upgrade, a new function to > > support above capability. > > Signed-off-by: Zhang Yanmin <[email protected]> > > --- > > drivers/usb/core/driver.c | 53 > +++++++++++++++++++++++++++++++++++++++++++++++ > > include/linux/usb.h | 3 +++ > > 2 files changed, 56 insertions(+) > > diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c > > index 818369a..d07fd8d 100644 > > --- a/drivers/usb/core/driver.c > > +++ b/drivers/usb/core/driver.c > > @@ -1684,6 +1684,59 @@ int usb_autopm_get_interface(struct usb_interface > *intf) > > EXPORT_SYMBOL_GPL(usb_autopm_get_interface); > > > /** > > + * usb_autopm_get_interface_retry - increment a USB interface's PM-usage > counter > > + * @intf: the usb_interface whose counter should be incremented
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