# RE: \[PATCH 2/2\] powerpc/usb: fix bug of CPU hang when missing USB PHY clock

- From: Liu Shengzhou-B36685 \<hidden\>
- Date: 2012-08-13 03:01:24 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2012/08/9470791
- Thread: https://ratatoskr.run/linuxppc-dev/2012/08/9470760/t.md

```text


> -----Original Message-----
> From: Kumar Gala [mailto:<redacted>]
> Sent: Friday, August 10, 2012 9:50 PM
> To: Liu Shengzhou-B36685
> Cc: <redacted> list; <redacted>;
> gregkh@linuxfoundation.org
> Subject: Re: [PATCH 2/2] powerpc/usb: fix bug of CPU hang when missing US=
B PHY
> clock
>=20
>=20
> On Aug 10, 2012, at 5:48 AM, Shengzhou Liu wrote:
>=20
> > when missing USB PHY clock, kernel booting up will hang during USB
> > initialization. We should check USBGP[PHY_CLK_VALID] bit to avoid CPU
> > hanging in this case.
> >
> > Signed-off-by: Shengzhou Liu <redacted>
> > ---
> > drivers/usb/host/ehci-fsl.c |   63 ++++++++++++++++++++++++++++++------=
-----
> -
> > drivers/usb/host/ehci-fsl.h |    1 +
> > 2 files changed, 46 insertions(+), 18 deletions(-)
>=20
> I assume this should be considered a bug fix and be looked at for inclusi=
on in
> v3.6?
>=20
> - k
[Shengzhou] Yes.=20
```