On 2021/4/8 17:22, Greg KH Wrote:
> On Thu, Apr 08, 2021 at 05:11:12PM +0800, Longfang Liu wrote:
>> Some types of EHCI controllers do not have SBRN registers.
>> By comparing the white list, the operation of reading the SBRN
>> registers is skipped.
>>
>> Subsequent EHCI controller types without SBRN registers can be
>> directly added to the white list.
>>
>> The current patch does not affect the drive function.
>>
>> Signed-off-by: Longfang Liu <liulongf...@huawei.com>
>> ---
>>  drivers/usb/host/ehci-pci.c | 27 +++++++++++++++++++++++----
>>  1 file changed, 23 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
>> index 3c3820a..6a30afa 100644
>> --- a/drivers/usb/host/ehci-pci.c
>> +++ b/drivers/usb/host/ehci-pci.c
>> @@ -47,6 +47,28 @@ static inline bool is_bypassed_id(struct pci_dev *pdev)
>>      return !!pci_match_id(bypass_pci_id_table, pdev);
>>  }
>>  
>> +static const struct usb_nosbrn_whitelist_entry {
>> +    unsigned short vendor;
>> +    unsigned short device;
> 
> u16 here please.
> 
>> +} usb_nosbrn_whitelist[] = {
>> +    /* STMICRO ConneXT has no sbrn register */
>> +    {PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_USB_HOST},
>> +    {}
> 
> trailing , please.
> 

Is it necessary to add "," at the end here?

>> +};
>> +
>> +static bool usb_nosbrn_whitelist_check(struct pci_dev *pdev)
>> +{
>> +    const struct usb_nosbrn_whitelist_entry *entry;
>> +
>> +    for (entry = usb_nosbrn_whitelist; entry->vendor; entry++) {
>> +            if (pdev->vendor == entry->vendor &&
>> +                pdev->device == entry->device)
>> +                    return true;
>> +    }
>> +
>> +    return false;
>> +}
>> +
>>  /*
>>   * 0x84 is the offset of in/out threshold register,
>>   * and it is the same offset as the register of 'hostpc'.
>> @@ -288,10 +310,7 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
>>      }
>>  
>>      /* Serial Bus Release Number is at PCI 0x60 offset */
>> -    if (pdev->vendor == PCI_VENDOR_ID_STMICRO
>> -        && pdev->device == PCI_DEVICE_ID_STMICRO_USB_HOST)
>> -            ;       /* ConneXT has no sbrn register */
>> -    else
>> +    if (!usb_nosbrn_whitelist_check(pdev))
> 
> Doing this as a "negative" is hard to understand.  Should this just be:
>       forbid_sbrn_read()
> or something like that?
> 
> The term "whitelist" is not a good thing to use as it does not really
> explain anything here.
> 
> thanks,
> 
> greg k-h
> .
> 
Thanks
Longfang.

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