On Fri, 03 Jul 2020, Minas Harutyunyan wrote:
> Hi,
>
> On 7/3/2020 11:29 AM, Greg KH wrote:
> > On Thu, Jul 02, 2020 at 03:46:06PM +0100, Lee Jones wrote:
> >> Commit ec1f9d9f01384 ("usb: dwc2: gadget: parity fix in isochronous mode") moved
> >> these checks to dwc2_hsotg_change_ep_iso_parity() back in 2015. The assigned
> >> value hasn't been read back since. Let's remove the unnecessary H/W read.
> >>
> >> Fixes the following W=1 warning:
> >>
> >> drivers/usb/dwc2/gadget.c: In function ‘dwc2_hsotg_epint’:
> >> drivers/usb/dwc2/gadget.c:2981:6: warning: variable ‘ctrl’ set but not used [-Wunused-but-set-variable]
> >> 2981 | u32 ctrl;
> >> | ^~~~
> >>
> >> Cc: Minas Harutyunyan <hminas@xxxxxxxxxxxx>
> >> Cc: Ben Dooks <ben@xxxxxxxxxxxx>
> >> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
> >> ---
> >> drivers/usb/dwc2/gadget.c | 2 --
> >> 1 file changed, 2 deletions(-)
> >>
> >> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> >> index 116e6175c7a48..fa07e3fcb8841 100644
> >> --- a/drivers/usb/dwc2/gadget.c
> >> +++ b/drivers/usb/dwc2/gadget.c
> >> @@ -2975,10 +2975,8 @@ static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx,
> >> u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx);
> >> u32 epsiz_reg = dir_in ? DIEPTSIZ(idx) : DOEPTSIZ(idx);
> >> u32 ints;
> >> - u32 ctrl;
> >>
> >> ints = dwc2_gadget_read_ep_interrupts(hsotg, idx, dir_in);
> >> - ctrl = dwc2_readl(hsotg, epctl_reg);
> >
> > As you know, lots of hardware requires reads to happen to do things, so
> > are you sure it is safe to remove this read call?
> >
>
> Greg, yes, it's Ok to remove this unnecessary read which remained from
> previous implementations.
>
> Lee, please add "Fixes:" tag and resubmit v2.
Is this suitable for Stable Greg?
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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