在2025年1月14日一月 下午6:46，Greg KH写道：
On Tue, Jan 14, 2025 at 06:11:58PM +0000, Jiaxun Yang wrote:
pci-legacy systems are not using logic_pio to managed PIO allocations, thus the generic pci_address_to_pio won't work when PCI_IOBASE is defined.
Override the function to use architecture implementation to fix the problem.
Cc: stable@vger.kernel.org Fixes: 4bfb53e7d317 ("mips: add <asm-generic/io.h> including") Reported-by: Mateusz Jończyk mat.jonczyk@o2.pl Closes: https://lore.kernel.org/r/99f75c66-4c2d-45dc-a808-b5ba440c7551@app.fastmail.... Signed-off-by: Jiaxun Yang jiaxun.yang@flygoat.com
This is a quick fix for fixes tree and stable backporting. In long term, we should get logic_pio accept fixed mapping, and make PCI core code aware of platforms not using vmap for PCI_IOBASE.
Why not do the real work now. Don't worry about stable kernels, fix it properly.
:-( Sadly the long-term solution is going to be a huge effort across architectures, and I'm not even sure if people will agree with my approach. So I'd prefer get this fix applied first and kick up discussions on a long-term solution.
Will post RFC shortly.
Thanks
thanks,
greg k-h