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Date: Fri, 17 Jan 2020 16:12:27 +0000 From: Steven Price <steven.price@....com> To: Sasha Levin <sashal@...nel.org> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org>, Dan Carpenter <dan.carpenter@...cle.com>, Rob Herring <robh@...nel.org>, "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org> Subject: Re: [PATCH AUTOSEL 5.4 002/205] drm/panfrost: Add missing check for pfdev->regulator On Thu, Jan 16, 2020 at 04:39:37PM +0000, Sasha Levin wrote: > From: Steven Price <steven.price@....com> > > [ Upstream commit 52282163dfa651849e905886845bcf6850dd83c2 ] This commit is effectively already in 5.4. Confusingly there were two versions of this upstream: 52282163dfa6 ("drm/panfrost: Add missing check for pfdev->regulator") c90f30812a79 ("drm/panfrost: Add missing check for pfdev->regulator") It got merged both through a -fixes branch and through the normal merge window. The two copies caused a bad merge in mainline and this was effectively reverted in commit 603e398a3db2 ("drm/panfrost: Remove NULL check for regulator"). c90f30812a79 is included in v5.4 so should already be in any v5.4.y release. Steve > > When modifying panfrost_devfreq_target() to support a device without a > regulator defined I missed the check on the error path. Let's add it. > > Reported-by: Dan Carpenter <dan.carpenter@...cle.com> > Fixes: e21dd290881b ("drm/panfrost: Enable devfreq to work without regulator") > Signed-off-by: Steven Price <steven.price@....com> > Signed-off-by: Rob Herring <robh@...nel.org> > Link: https://patchwork.freedesktop.org/patch/msgid/20190822093218.26014-1-steven.price@arm.com > Signed-off-by: Sasha Levin <sashal@...nel.org> > --- > drivers/gpu/drm/panfrost/panfrost_devfreq.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c > index 12ff77dacc95..c1eb8cfe6aeb 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c > +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c > @@ -53,8 +53,10 @@ static int panfrost_devfreq_target(struct device *dev, unsigned long *freq, > if (err) { > dev_err(dev, "Cannot set frequency %lu (%d)\n", target_rate, > err); > - regulator_set_voltage(pfdev->regulator, pfdev->devfreq.cur_volt, > - pfdev->devfreq.cur_volt); > + if (pfdev->regulator) > + regulator_set_voltage(pfdev->regulator, > + pfdev->devfreq.cur_volt, > + pfdev->devfreq.cur_volt); > return err; > } > > -- > 2.20.1 >
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