On Wed, 2020-08-19 at 10:59 -0400, Alan Stern wrote:
> On Wed, Aug 19, 2020 at 08:41:05PM +0800, Chunfeng Yun wrote:
> > Use readl_poll_timeout_atomic() to simplify code
> >
> > Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> > Cc: Felipe Balbi <balbi@xxxxxxxxxx>
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
> > ---
> > drivers/usb/gadget/udc/net2280.c | 21 ++++++++++-----------
> > 1 file changed, 10 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
> > index 7530bd9..f1a21f4 100644
> > --- a/drivers/usb/gadget/udc/net2280.c
> > +++ b/drivers/usb/gadget/udc/net2280.c
> > @@ -52,6 +52,7 @@
> > #include <linux/usb/gadget.h>
> > #include <linux/prefetch.h>
> > #include <linux/io.h>
> > +#include <linux/iopoll.h>
> >
> > #include <asm/byteorder.h>
> > #include <asm/irq.h>
> > @@ -360,18 +361,16 @@ static inline void enable_pciirqenb(struct net2280_ep *ep)
> > static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
> > {
> > u32 result;
> > + int ret;
> >
> > - do {
> > - result = readl(ptr);
> > - if (result == ~(u32)0) /* "device unplugged" */
> > - return -ENODEV;
> > - result &= mask;
> > - if (result == done)
> > - return 0;
> > - udelay(1);
> > - usec--;
> > - } while (usec > 0);
> > - return -ETIMEDOUT;
> > + ret = readl_poll_timeout_atomic(ptr, result,
> > + ((result & mask) == done ||
> > + result == U32_MAX),
> > + 1, usec);
> > + if (result == U32_MAX) /* device unplugged */
> > + return -ENODEV;
> > +
> > + return ret;
> > }
> >
> > static const struct usb_ep_ops net2280_ep_ops;
> > --
>
> Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
>
> However, I noticed that the kerneldoc for readl_poll_timeout_atomic() is
> out of date. Can you fix it up?
Ok, will do it, thanks
>
> Alan Stern
