Re: [PATCH 1/1] usb: cdns3: Put the cdns set active part outside the spin lock

[wangxiaolei <xiaolei.wang@xxxxxxxxxxxxx>]

On 5/5/23 6:33 PM, Greg KH wrote:
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> On Thu, May 04, 2023 at 09:16:02PM +0800, Xiaolei Wang wrote:
> > The device may be scheduled during the resume process,
> > so this cannot appear in atomic operations. Since
> > pm_runtime_set_active will resume suppliers, put set
> > active outside the spin lock, which is only used to
> > protect the struct cdns data structure, otherwise the
> > kernel will report the following warning:
> >
> >    BUG: sleeping function called from invalid context at drivers/base/power/runtime.c:1163
> >    in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 651, name: sh
> >    preempt_count: 1, expected: 0
> >    RCU nest depth: 0, expected: 0
> >    CPU: 0 PID: 651 Comm: sh Tainted: G        WC         6.1.20 #1
> >    Hardware name: Freescale i.MX8QM MEK (DT)
> >    Call trace:
> >      dump_backtrace.part.0+0xe0/0xf0
> >      show_stack+0x18/0x30
> >      dump_stack_lvl+0x64/0x80
> >      dump_stack+0x1c/0x38
> >      __might_resched+0x1fc/0x240
> >      __might_sleep+0x68/0xc0
> >      __pm_runtime_resume+0x9c/0xe0
> >      rpm_get_suppliers+0x68/0x1b0
> >      __pm_runtime_set_status+0x298/0x560
> >      cdns_resume+0xb0/0x1c0
> >      cdns3_controller_resume.isra.0+0x1e0/0x250
> >      cdns3_plat_resume+0x28/0x40
> >
> > Signed-off-by: Xiaolei Wang <xiaolei.wang@xxxxxxxxxxxxx>
> > ---
> >   drivers/usb/cdns3/cdns3-plat.c |  3 ++-
> >   drivers/usb/cdns3/cdnsp-pci.c  |  3 ++-
> >   drivers/usb/cdns3/core.c       | 14 +++++++++++---
> >   drivers/usb/cdns3/core.h       |  3 ++-
> >   4 files changed, 17 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/usb/cdns3/cdns3-plat.c b/drivers/usb/cdns3/cdns3-plat.c
> > index 2bc5d094548b..726b2e4f67e4 100644
> > --- a/drivers/usb/cdns3/cdns3-plat.c
> > +++ b/drivers/usb/cdns3/cdns3-plat.c
> > @@ -256,9 +256,10 @@ static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
> >        cdns3_set_platform_suspend(cdns->dev, false, false);
> >
> >        spin_lock_irqsave(&cdns->lock, flags);
> > -     cdns_resume(cdns, !PMSG_IS_AUTO(msg));
> > +     cdns_resume(cdns);
> >        cdns->in_lpm = false;
> >        spin_unlock_irqrestore(&cdns->lock, flags);
> > +     cdns_set_active(cdns, !PMSG_IS_AUTO(msg));
> >        if (cdns->wakeup_pending) {
> >                cdns->wakeup_pending = false;
> >                enable_irq(cdns->wakeup_irq);
> > diff --git a/drivers/usb/cdns3/cdnsp-pci.c b/drivers/usb/cdns3/cdnsp-pci.c
> > index 7b151f5af3cc..0725668ffea4 100644
> > --- a/drivers/usb/cdns3/cdnsp-pci.c
> > +++ b/drivers/usb/cdns3/cdnsp-pci.c
> > @@ -208,8 +208,9 @@ static int __maybe_unused cdnsp_pci_resume(struct device *dev)
> >        int ret;
> >
> >        spin_lock_irqsave(&cdns->lock, flags);
> > -     ret = cdns_resume(cdns, 1);
> > +     ret = cdns_resume(cdns);
> >        spin_unlock_irqrestore(&cdns->lock, flags);
> > +     cdns_set_active(cdns, 1);
> >
> >        return ret;
> >   }
> > diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
> > index dbcdf3b24b47..661d5597fb68 100644
> > --- a/drivers/usb/cdns3/core.c
> > +++ b/drivers/usb/cdns3/core.c
> > @@ -522,7 +522,7 @@ int cdns_suspend(struct cdns *cdns)
> >   }
> >   EXPORT_SYMBOL_GPL(cdns_suspend);
> >
> > -int cdns_resume(struct cdns *cdns, u8 set_active)
> > +int cdns_resume(struct cdns *cdns)
> >   {
> >        struct device *dev = cdns->dev;
> >        enum usb_role real_role;
> > @@ -556,15 +556,23 @@ int cdns_resume(struct cdns *cdns, u8 set_active)
> >        if (cdns->roles[cdns->role]->resume)
> >                cdns->roles[cdns->role]->resume(cdns, cdns_power_is_lost(cdns));
> >
> > +     return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(cdns_resume);
> > +
> > +void cdns_set_active(struct cdns *cdns, u8 set_active)
> > +{
> > +     struct device *dev = cdns->dev;
> > +
> >        if (set_active) {
> >                pm_runtime_disable(dev);
> >                pm_runtime_set_active(dev);
> >                pm_runtime_enable(dev);
> >        }
> >
> > -     return 0;
> > +     return;
> >   }
> > -EXPORT_SYMBOL_GPL(cdns_resume);
> > +EXPORT_SYMBOL_GPL(cdns_set_active);
> >   #endif /* CONFIG_PM_SLEEP */
> >
> >   MODULE_AUTHOR("Peter Chen <peter.chen@xxxxxxx>");
> > diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
> > index 2d332a788871..0f429042f997 100644
> > --- a/drivers/usb/cdns3/core.h
> > +++ b/drivers/usb/cdns3/core.h
> > @@ -125,8 +125,9 @@ int cdns_init(struct cdns *cdns);
> >   int cdns_remove(struct cdns *cdns);
> >
> >   #ifdef CONFIG_PM_SLEEP
> > -int cdns_resume(struct cdns *cdns, u8 set_active);
> > +int cdns_resume(struct cdns *cdns);
> >   int cdns_suspend(struct cdns *cdns);
> > +void cdns_set_active(struct cdns *cdns, u8 set_active);
> >   #else /* CONFIG_PM_SLEEP */
> >   static inline int cdns_resume(struct cdns *cdns, u8 set_active)
> >   { return 0; }
> > --
> > 2.25.1
>
> Hi,
>
> This is the friendly semi-automated patch-bot of Greg Kroah-Hartman.
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Can someone help review this patch?

thanks

xiaolei

> thanks,
>
> greg k-h's patch email bot