linux-kernel - Re: [PATCH stable-5.15 1/3] usb: dwc3: fix PHY disable sequence

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Message-ID: <Yxc8NclTP8hwmQG9@hovoldconsulting.com>
Date:   Tue, 6 Sep 2022 14:25:25 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>,
        Andrew Halaney <ahalaney@...hat.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: Re: [PATCH stable-5.15 1/3] usb: dwc3: fix PHY disable sequence

On Tue, Sep 06, 2022 at 02:16:24PM +0200, Greg Kroah-Hartman wrote:
> On Tue, Sep 06, 2022 at 02:07:00PM +0200, Johan Hovold wrote:
> > From: Johan Hovold <johan+linaro@...nel.org>
> > 
> > commit d2ac7bef95c9ead307801ccb6cb6dfbeb14247bf upstream.
> > 
> > Generic PHYs must be powered-off before they can be tore down.
> > 
> > Similarly, suspending legacy PHYs after having powered them off makes no
> > sense.
> > 
> > Fix the dwc3_core_exit() (e.g. called during suspend) and open-coded
> > dwc3_probe() error-path sequences that got this wrong.
> > 
> > Note that this makes dwc3_core_exit() match the dwc3_core_init() error
> > path with respect to powering off the PHYs.
> > 
> > Fixes: 03c1fd622f72 ("usb: dwc3: core: add phy cleanup for probe error handling")
> > Fixes: c499ff71ff2a ("usb: dwc3: core: re-factor init and exit paths")
> > Cc: stable@...r.kernel.org      # 4.8
> > Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
> > Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > Link: https://lore.kernel.org/r/20220804151001.23612-2-johan+linaro@kernel.org
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > [ johan: adjust context to 5.15 ]
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> >  drivers/usb/dwc3/core.c | 19 ++++++++++---------
> >  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> This one did not apply to 4.9.y, 4.14.y, or 4.19.y :(

Perhaps someone who cares about these old trees can do the backports.
Should be as trivial. Can't be the patch submitters responsibility to
maintain 8 stable trees.

Johan