linux-kernel - Re: [PATCH V5 02/16] PCI/PME: Export pcie_pme_disable_msi() & pcie_pme_no

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Message-ID: <f550fc06-98b1-0e08-874a-f2fba49d32b5@nvidia.com>
Date:   Tue, 7 May 2019 13:21:11 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <jonathanh@...dia.com>, <kishon@...com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <jingoohan1@...il.com>,
        <gustavo.pimentel@...opsys.com>, <mperttunen@...dia.com>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH V5 02/16] PCI/PME: Export pcie_pme_disable_msi() &
 pcie_pme_no_msi() APIs

On 5/7/2019 12:40 PM, Vidya Sagar wrote:
> On 5/3/2019 4:31 PM, Thierry Reding wrote:
>> On Wed, Apr 24, 2019 at 10:49:50AM +0530, Vidya Sagar wrote:
>>> Export pcie_pme_disable_msi() & pcie_pme_no_msi() APIs to enable drivers
>>> using this API be able to build as loadable modules.
>>>
>>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>>> ---
>>> Changes from [v4]:
>>> * None
>>>
>>> Changes from [v3]:
>>> * None
>>>
>>> Changes from [v2]:
>>> * Exported pcie_pme_no_msi() API after making pcie_pme_msi_disabled a static
>>>
>>> Changes from [v1]:
>>> * This is a new patch in v2 series
>>>
>>>   drivers/pci/pcie/pme.c     | 14 +++++++++++++-
>>>   drivers/pci/pcie/portdrv.h | 16 +++-------------
>>>   2 files changed, 16 insertions(+), 14 deletions(-)
>>>
>>> diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c
>>> index 54d593d10396..d5e0ea4a62fc 100644
>>> --- a/drivers/pci/pcie/pme.c
>>> +++ b/drivers/pci/pcie/pme.c
>>> @@ -25,7 +25,19 @@
>>>    * that using MSI for PCIe PME signaling doesn't play well with PCIe PME-based
>>>    * wake-up from system sleep states.
>>>    */
>>> -bool pcie_pme_msi_disabled;
>>> +static bool pcie_pme_msi_disabled;
>>> +
>>> +void pcie_pme_disable_msi(void)
>>> +{
>>> +    pcie_pme_msi_disabled = true;
>>> +}
>>> +EXPORT_SYMBOL_GPL(pcie_pme_disable_msi);
>>> +
>>> +bool pcie_pme_no_msi(void)
>>> +{
>>> +    return pcie_pme_msi_disabled;
>>> +}
>>> +EXPORT_SYMBOL_GPL(pcie_pme_no_msi);
>>>   static int __init pcie_pme_setup(char *str)
>>>   {
>>> diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
>>> index 1d50dc58ac40..7c8c3da4bd58 100644
>>> --- a/drivers/pci/pcie/portdrv.h
>>> +++ b/drivers/pci/pcie/portdrv.h
>>> @@ -125,22 +125,12 @@ void pcie_port_bus_unregister(void);
>>>   struct pci_dev;
>>>   #ifdef CONFIG_PCIE_PME
>>> -extern bool pcie_pme_msi_disabled;
>>> -
>>> -static inline void pcie_pme_disable_msi(void)
>>> -{
>>> -    pcie_pme_msi_disabled = true;
>>> -}
>>> -
>>> -static inline bool pcie_pme_no_msi(void)
>>> -{
>>> -    return pcie_pme_msi_disabled;
>>> -}
>>> -
>>> +void pcie_pme_disable_msi(void);
>>> +bool pcie_pme_no_msi(void);
>>>   void pcie_pme_interrupt_enable(struct pci_dev *dev, bool enable);
>>>   #else /* !CONFIG_PCIE_PME */
>>>   static inline void pcie_pme_disable_msi(void) {}
>>> -static inline bool pcie_pme_no_msi(void) { return false; }
>>> +static inline bool pcie_pme_no_msi(void) {}
>>
>> This looks wrong.
> Can you please give more info on what is wrong in this?
Is missing "return false;" the wrong here or there is more than just this?

> 
>>
>> Thierry
>>
>