Re: [PATCH] USB / dwc3: remove the use of -ENOSYS from core.c

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On Thu, 2022-05-19 at 17:59 +0200, Greg KH wrote:
> On Tue, May 17, 2022 at 08:22:00PM +0530, Kushagra Verma wrote:
> > This patch removes the use of -ENOSYS as it is used when users try
> > to call a
> > syscall that doesn't exist. So, we don't need to check if 'ret == -
> > ENOSYS'.
> 
> ENOSYS is also used internally in the kernel for other things.
> 
> > 
> > Signed-off-by: Kushagra Verma <kushagra765@xxxxxxxxxxx>
> > ---
> >  drivers/usb/dwc3/core.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > index c78205c5e19f..3c1a877d5183 100644
> > --- a/drivers/usb/dwc3/core.c
> > +++ b/drivers/usb/dwc3/core.c
> > @@ -1283,7 +1283,7 @@ static int dwc3_core_get_phy(struct dwc3
> > *dwc)
> >         dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
> >         if (IS_ERR(dwc->usb2_generic_phy)) {
> >                 ret = PTR_ERR(dwc->usb2_generic_phy);
> > -               if (ret == -ENOSYS || ret == -ENODEV)
> > +               if (ret == -ENODEV)
> 
> Did you validate that no callers can ever set this to ENOSYS?
Yes, I think no callers should ever set ret to ENOSYS unless it comes under the other things ENOSYS is used for.
> 
> Why was this added in the first place?  What commit added it?
This was added by commit 57303488cd37d ("usb: dwc3: adapt dwc3 core to use Generic PHY Framework").
> 
> thanks,
> 
> greg k-h

Thanks,

Kushagra





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