| Message ID | 20240119014807.268694-1-marex@denx.de (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | [v2] pmdomain: imx8m-blk-ctrl: imx8mp-blk-ctrl: Error out if domains are missing in DT | expand |
> Subject: [PATCH v2] pmdomain: imx8m-blk-ctrl: imx8mp-blk-ctrl: Error out if > domains are missing in DT > > This driver assumes that domain->power_dev is non-NULL in its > suspend/resume path. The assumption is valid, since all the devices that are > being looked up here should be described in DT. In case they are not > described in DT, beause the DT is faulty, suspend/resume attempt would > trigger NULL pointer dereference. > To avoid this failure, check whether the power_dev assignment is not NULL > right away in probe callback and fail early if it is. > > Signed-off-by: Marek Vasut <marex@denx.de> Reviewed-by: Peng Fan <peng.fan@nxp.com> > --- > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> > Cc: Fabio Estevam <festevam@gmail.com> > Cc: Jindong Yue <jindong.yue@nxp.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Marco Felsch <m.felsch@pengutronix.de> > Cc: NXP Linux Team <linux-imx@nxp.com> > Cc: Peng Fan <peng.fan@nxp.com> > Cc: Pengutronix Kernel Team <kernel@pengutronix.de> > Cc: Sascha Hauer <s.hauer@pengutronix.de> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Ulf Hansson <ulf.hansson@linaro.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-pm@vger.kernel.org > --- > V2: Add extra check for domain being NULL (thanks Peng) > --- > drivers/pmdomain/imx/imx8m-blk-ctrl.c | 9 ++++++--- > drivers/pmdomain/imx/imx8mp-blk-ctrl.c | 9 ++++++--- > 2 files changed, 12 insertions(+), 6 deletions(-) > > diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c > b/drivers/pmdomain/imx/imx8m-blk-ctrl.c > index 1341a707f61bc..ca942d7929c2b 100644 > --- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c > +++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c > @@ -258,11 +258,14 @@ static int imx8m_blk_ctrl_probe(struct > platform_device *pdev) > > domain->power_dev = > dev_pm_domain_attach_by_name(dev, data- > >gpc_name); > - if (IS_ERR(domain->power_dev)) { > - dev_err_probe(dev, PTR_ERR(domain->power_dev), > + if (IS_ERR_OR_NULL(domain->power_dev)) { > + if (!domain->power_dev) > + ret = -ENODEV; > + else > + ret = PTR_ERR(domain->power_dev); > + dev_err_probe(dev, ret, > "failed to attach power domain > \"%s\"\n", > data->gpc_name); > - ret = PTR_ERR(domain->power_dev); > goto cleanup_pds; > } > > diff --git a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > index e3203eb6a0229..e488cf79b8007 100644 > --- a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > +++ b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > @@ -687,11 +687,14 @@ static int imx8mp_blk_ctrl_probe(struct > platform_device *pdev) > > domain->power_dev = > dev_pm_domain_attach_by_name(dev, data- > >gpc_name); > - if (IS_ERR(domain->power_dev)) { > - dev_err_probe(dev, PTR_ERR(domain->power_dev), > + if (IS_ERR_OR_NULL(domain->power_dev)) { > + if (!domain->power_dev) > + ret = -ENODEV; > + else > + ret = PTR_ERR(domain->power_dev); > + dev_err_probe(dev, ret, > "failed to attach power domain %s\n", > data->gpc_name); > - ret = PTR_ERR(domain->power_dev); > goto cleanup_pds; > } > > -- > 2.43.0
On Fri, Jan 19, 2024 at 02:47:41AM +0100, Marek Vasut wrote: > This driver assumes that domain->power_dev is non-NULL in its suspend/resume > path. The assumption is valid, since all the devices that are being looked up > here should be described in DT. In case they are not described in DT, beause > the DT is faulty, suspend/resume attempt would trigger NULL pointer dereference. > To avoid this failure, check whether the power_dev assignment is not NULL right > away in probe callback and fail early if it is. > > Signed-off-by: Marek Vasut <marex@denx.de> > --- > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> > Cc: Fabio Estevam <festevam@gmail.com> > Cc: Jindong Yue <jindong.yue@nxp.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Marco Felsch <m.felsch@pengutronix.de> > Cc: NXP Linux Team <linux-imx@nxp.com> > Cc: Peng Fan <peng.fan@nxp.com> > Cc: Pengutronix Kernel Team <kernel@pengutronix.de> > Cc: Sascha Hauer <s.hauer@pengutronix.de> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Ulf Hansson <ulf.hansson@linaro.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-pm@vger.kernel.org > --- > V2: Add extra check for domain being NULL (thanks Peng) > --- > drivers/pmdomain/imx/imx8m-blk-ctrl.c | 9 ++++++--- > drivers/pmdomain/imx/imx8mp-blk-ctrl.c | 9 ++++++--- > 2 files changed, 12 insertions(+), 6 deletions(-) > > diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c b/drivers/pmdomain/imx/imx8m-blk-ctrl.c > index 1341a707f61bc..ca942d7929c2b 100644 > --- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c > +++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c > @@ -258,11 +258,14 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev) > > domain->power_dev = > dev_pm_domain_attach_by_name(dev, data->gpc_name); > - if (IS_ERR(domain->power_dev)) { > - dev_err_probe(dev, PTR_ERR(domain->power_dev), > + if (IS_ERR_OR_NULL(domain->power_dev)) { > + if (!domain->power_dev) > + ret = -ENODEV; > + else > + ret = PTR_ERR(domain->power_dev); > + dev_err_probe(dev, ret, > "failed to attach power domain \"%s\"\n", > data->gpc_name); > - ret = PTR_ERR(domain->power_dev); > goto cleanup_pds; > } > > diff --git a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > index e3203eb6a0229..e488cf79b8007 100644 > --- a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > +++ b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > @@ -687,11 +687,14 @@ static int imx8mp_blk_ctrl_probe(struct platform_device *pdev) > > domain->power_dev = > dev_pm_domain_attach_by_name(dev, data->gpc_name); > - if (IS_ERR(domain->power_dev)) { > - dev_err_probe(dev, PTR_ERR(domain->power_dev), > + if (IS_ERR_OR_NULL(domain->power_dev)) { > + if (!domain->power_dev) > + ret = -ENODEV; > + else > + ret = PTR_ERR(domain->power_dev); > + dev_err_probe(dev, ret, > "failed to attach power domain %s\n", > data->gpc_name); > - ret = PTR_ERR(domain->power_dev); This could be made a bit more compact using: domain->power_dev = dev_pm_domain_attach_by_name(dev, data->gpc_name) || ERR_PTR(-ENODEV); if (IS_ERR(domain->power_dev)) { ret = PTR_ERR(domain->power_dev); ... I'm unsure though if this is human friendly enough?! Having said that I wonder about dev_pm_domain_attach_by_name(). IMHO if NULL is an error case it and other errors are signaled by error pointers, there is something to fix there. Best regards Uwe
On 1/19/24 08:42, Uwe Kleine-König wrote: > On Fri, Jan 19, 2024 at 02:47:41AM +0100, Marek Vasut wrote: >> This driver assumes that domain->power_dev is non-NULL in its suspend/resume >> path. The assumption is valid, since all the devices that are being looked up >> here should be described in DT. In case they are not described in DT, beause >> the DT is faulty, suspend/resume attempt would trigger NULL pointer dereference. >> To avoid this failure, check whether the power_dev assignment is not NULL right >> away in probe callback and fail early if it is. >> >> Signed-off-by: Marek Vasut <marex@denx.de> >> --- >> Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> >> Cc: Fabio Estevam <festevam@gmail.com> >> Cc: Jindong Yue <jindong.yue@nxp.com> >> Cc: Lucas Stach <l.stach@pengutronix.de> >> Cc: Marco Felsch <m.felsch@pengutronix.de> >> Cc: NXP Linux Team <linux-imx@nxp.com> >> Cc: Peng Fan <peng.fan@nxp.com> >> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> >> Cc: Sascha Hauer <s.hauer@pengutronix.de> >> Cc: Shawn Guo <shawnguo@kernel.org> >> Cc: Ulf Hansson <ulf.hansson@linaro.org> >> Cc: linux-arm-kernel@lists.infradead.org >> Cc: linux-pm@vger.kernel.org >> --- >> V2: Add extra check for domain being NULL (thanks Peng) >> --- >> drivers/pmdomain/imx/imx8m-blk-ctrl.c | 9 ++++++--- >> drivers/pmdomain/imx/imx8mp-blk-ctrl.c | 9 ++++++--- >> 2 files changed, 12 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c b/drivers/pmdomain/imx/imx8m-blk-ctrl.c >> index 1341a707f61bc..ca942d7929c2b 100644 >> --- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c >> +++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c >> @@ -258,11 +258,14 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev) >> >> domain->power_dev = >> dev_pm_domain_attach_by_name(dev, data->gpc_name); >> - if (IS_ERR(domain->power_dev)) { >> - dev_err_probe(dev, PTR_ERR(domain->power_dev), >> + if (IS_ERR_OR_NULL(domain->power_dev)) { >> + if (!domain->power_dev) >> + ret = -ENODEV; >> + else >> + ret = PTR_ERR(domain->power_dev); >> + dev_err_probe(dev, ret, >> "failed to attach power domain \"%s\"\n", >> data->gpc_name); >> - ret = PTR_ERR(domain->power_dev); >> goto cleanup_pds; >> } >> >> diff --git a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c >> index e3203eb6a0229..e488cf79b8007 100644 >> --- a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c >> +++ b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c >> @@ -687,11 +687,14 @@ static int imx8mp_blk_ctrl_probe(struct platform_device *pdev) >> >> domain->power_dev = >> dev_pm_domain_attach_by_name(dev, data->gpc_name); >> - if (IS_ERR(domain->power_dev)) { >> - dev_err_probe(dev, PTR_ERR(domain->power_dev), >> + if (IS_ERR_OR_NULL(domain->power_dev)) { >> + if (!domain->power_dev) >> + ret = -ENODEV; >> + else >> + ret = PTR_ERR(domain->power_dev); >> + dev_err_probe(dev, ret, >> "failed to attach power domain %s\n", >> data->gpc_name); >> - ret = PTR_ERR(domain->power_dev); > > This could be made a bit more compact using: > > domain->power_dev = > dev_pm_domain_attach_by_name(dev, data->gpc_name) || > ERR_PTR(-ENODEV); > if (IS_ERR(domain->power_dev)) { > ret = PTR_ERR(domain->power_dev); > ... > > I'm unsure though if this is human friendly enough?! I think it is only more cryptic and doesn't improve readability. > Having said that I wonder about dev_pm_domain_attach_by_name(). IMHO if > NULL is an error case it and other errors are signaled by error > pointers, there is something to fix there. I don't think dev_pm_domain_attach_by_name() returning NULL is an error -- the domain may be missing from DT and that is legitimate use case I think. But not here, where all the domains should be described in DT because the driver makes assumptions about their presence in the suspend/resume part, and because the DT should fully describe the domains of this hardware anyway, so we better catch such DT issues.
On Fri, 19 Jan 2024 at 02:48, Marek Vasut <marex@denx.de> wrote: > > This driver assumes that domain->power_dev is non-NULL in its suspend/resume > path. The assumption is valid, since all the devices that are being looked up > here should be described in DT. In case they are not described in DT, beause > the DT is faulty, suspend/resume attempt would trigger NULL pointer dereference. > To avoid this failure, check whether the power_dev assignment is not NULL right > away in probe callback and fail early if it is. > > Signed-off-by: Marek Vasut <marex@denx.de> Applied for next, thanks! Kind regards Uffe > --- > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> > Cc: Fabio Estevam <festevam@gmail.com> > Cc: Jindong Yue <jindong.yue@nxp.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Marco Felsch <m.felsch@pengutronix.de> > Cc: NXP Linux Team <linux-imx@nxp.com> > Cc: Peng Fan <peng.fan@nxp.com> > Cc: Pengutronix Kernel Team <kernel@pengutronix.de> > Cc: Sascha Hauer <s.hauer@pengutronix.de> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Ulf Hansson <ulf.hansson@linaro.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-pm@vger.kernel.org > --- > V2: Add extra check for domain being NULL (thanks Peng) > --- > drivers/pmdomain/imx/imx8m-blk-ctrl.c | 9 ++++++--- > drivers/pmdomain/imx/imx8mp-blk-ctrl.c | 9 ++++++--- > 2 files changed, 12 insertions(+), 6 deletions(-) > > diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c b/drivers/pmdomain/imx/imx8m-blk-ctrl.c > index 1341a707f61bc..ca942d7929c2b 100644 > --- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c > +++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c > @@ -258,11 +258,14 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev) > > domain->power_dev = > dev_pm_domain_attach_by_name(dev, data->gpc_name); > - if (IS_ERR(domain->power_dev)) { > - dev_err_probe(dev, PTR_ERR(domain->power_dev), > + if (IS_ERR_OR_NULL(domain->power_dev)) { > + if (!domain->power_dev) > + ret = -ENODEV; > + else > + ret = PTR_ERR(domain->power_dev); > + dev_err_probe(dev, ret, > "failed to attach power domain \"%s\"\n", > data->gpc_name); > - ret = PTR_ERR(domain->power_dev); > goto cleanup_pds; > } > > diff --git a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > index e3203eb6a0229..e488cf79b8007 100644 > --- a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > +++ b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c > @@ -687,11 +687,14 @@ static int imx8mp_blk_ctrl_probe(struct platform_device *pdev) > > domain->power_dev = > dev_pm_domain_attach_by_name(dev, data->gpc_name); > - if (IS_ERR(domain->power_dev)) { > - dev_err_probe(dev, PTR_ERR(domain->power_dev), > + if (IS_ERR_OR_NULL(domain->power_dev)) { > + if (!domain->power_dev) > + ret = -ENODEV; > + else > + ret = PTR_ERR(domain->power_dev); > + dev_err_probe(dev, ret, > "failed to attach power domain %s\n", > data->gpc_name); > - ret = PTR_ERR(domain->power_dev); > goto cleanup_pds; > } > > -- > 2.43.0 >
diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c b/drivers/pmdomain/imx/imx8m-blk-ctrl.c index 1341a707f61bc..ca942d7929c2b 100644 --- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c +++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c @@ -258,11 +258,14 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev) domain->power_dev = dev_pm_domain_attach_by_name(dev, data->gpc_name); - if (IS_ERR(domain->power_dev)) { - dev_err_probe(dev, PTR_ERR(domain->power_dev), + if (IS_ERR_OR_NULL(domain->power_dev)) { + if (!domain->power_dev) + ret = -ENODEV; + else + ret = PTR_ERR(domain->power_dev); + dev_err_probe(dev, ret, "failed to attach power domain \"%s\"\n", data->gpc_name); - ret = PTR_ERR(domain->power_dev); goto cleanup_pds; } diff --git a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c index e3203eb6a0229..e488cf79b8007 100644 --- a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c +++ b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c @@ -687,11 +687,14 @@ static int imx8mp_blk_ctrl_probe(struct platform_device *pdev) domain->power_dev = dev_pm_domain_attach_by_name(dev, data->gpc_name); - if (IS_ERR(domain->power_dev)) { - dev_err_probe(dev, PTR_ERR(domain->power_dev), + if (IS_ERR_OR_NULL(domain->power_dev)) { + if (!domain->power_dev) + ret = -ENODEV; + else + ret = PTR_ERR(domain->power_dev); + dev_err_probe(dev, ret, "failed to attach power domain %s\n", data->gpc_name); - ret = PTR_ERR(domain->power_dev); goto cleanup_pds; }
This driver assumes that domain->power_dev is non-NULL in its suspend/resume path. The assumption is valid, since all the devices that are being looked up here should be described in DT. In case they are not described in DT, beause the DT is faulty, suspend/resume attempt would trigger NULL pointer dereference. To avoid this failure, check whether the power_dev assignment is not NULL right away in probe callback and fail early if it is. Signed-off-by: Marek Vasut <marex@denx.de> --- Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> Cc: Fabio Estevam <festevam@gmail.com> Cc: Jindong Yue <jindong.yue@nxp.com> Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Marco Felsch <m.felsch@pengutronix.de> Cc: NXP Linux Team <linux-imx@nxp.com> Cc: Peng Fan <peng.fan@nxp.com> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-pm@vger.kernel.org --- V2: Add extra check for domain being NULL (thanks Peng) --- drivers/pmdomain/imx/imx8m-blk-ctrl.c | 9 ++++++--- drivers/pmdomain/imx/imx8mp-blk-ctrl.c | 9 ++++++--- 2 files changed, 12 insertions(+), 6 deletions(-)