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SubjectRe: [Regression] Changes to i2c-piix4.c initialisation prevent loading of sp5100_tco watchdog driver on AMD SB800 chipset
On 04/01/2017 03:13 AM, Boszormenyi Zoltan wrote:
> 2017-03-31 17:05 keltezéssel, Guenter Roeck írta:
>> On Fri, Mar 31, 2017 at 04:46:02PM +0200, Boszormenyi Zoltan wrote:
>>> 2017-03-31 14:49 keltezéssel, Guenter Roeck írta:
>>>> request_muxed_region() can fail, and literally every other driver
>>>> using it checks for that failure. Please do the same.
>>> In what circumstances can request_muxed_region() fail? As far as
>>> I can see, only if two drivers use the same I/O port base and the
>>> already present region did not use IORESOURCE_MUXED which is
>>> not the case here. When request_muxed_region() is used consistently,
>>> subsequent requests are put on a wait queue and the first one is
>>> woken up when the region is released. So, it's basically a mutex.
>>> Am I missing something here?
>> Yes. failure to allocate the resource is one.
> So, a common mutex should be used.

Just because you don't want to check for errors ?

I am not on favor of your new solution. I think it violates layering all over
the place, and I dislike the idea of having a global mutex as you propose.
I won't shut it down, but I'll let others provide feedback on your new series
of patches.


> I have also added synchronization to the USB PCI quirks code and
> have split the patch into three pieces now (USB quirks, i2c-piix4 and
> sp5100_tco) and they were sent to the relevant mailing lists.
> I don't know which subsystem wants to take it, all 3 patches are
> needed at once.
> Best regards,
> Zoltán Böszörményi

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