Re: [PATCH] usertools: fix bind failure from dpdk to kernel

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed, 10 Aug 2022 09:02:57 +0300
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> wrote:

> On 09/08/2022 20:58, Stephen Hemminger wrote:
> >>
> >> However, due to the patch[1] merged into 5.19 kernel, 'driver_override'
> >> in the pci_dev is no longer NULL by writing '\00' to driver_override file.
> >> This causes PCI match device failure and the device will never be bound to
> >> their kernel driver.  
> > 
> > 
> > Linux kernel does not look favorably on API changes and that looks like
> > the kernel changed behavior. That should be reported and fixed there.  
> 
> To clarify around this issue:
> 
> There were no API changes. Linux kernel follows the API exactly how it
> is described in the API document since 2014:
> Documentation/ABI/testing/sysfs-bus-pci
> 
> There was no change in kernel API.
> 
> There was a change in undocumented, unsupported and wrong usage of
> driver_override API.
> 
> Best regards,
> Krzysztof

Linux documentation is not the standard, the code is.