On Mon, Apr 03, 2017 at 09:51:32AM +0200, Zoltan Boszormenyi wrote: > Use the common mutex from driver/usb/host/pci-quirks.c in the > i2c-piix4 driver to synchronize access to the I/O port pair > 0xcd6 / 0xcd7. > > At the same time, remove the request_region() call to reserve > these I/O ports, so the sp5100_tco watchdog driver can also > load. The mutex is enough to protect the I/O port accesses. > This is an old regression in Linux 4.4-rc4, caused by: > > v2: Explicit extern reference for sb800_mutex > > commit 2fee61d22e606fc99ade9079fda15fdee83ec33e > Author: Christian Fetzer <fetzer.ch@xxxxxxxxx> > Date: Thu Nov 19 20:13:48 2015 +0100 > > i2c: piix4: Add support for multiplexed main adapter in SB800 > > Signed-off-by: Zoltan Boszormenyi <zboszor@xxxxx> Given the global mutex approach is accepted, the actual changes here look okay to me. I'd really like a tag from Jean here, still. He is the expert for this hardware which I barely know.
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