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hwmon: (w83627hf) Use request_muxed_region for Super-IO accesses
authorGuenter Roeck <linux@roeck-us.net>
Fri, 5 Apr 2019 15:44:41 +0000 (08:44 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 29 Jan 2020 09:21:42 +0000 (10:21 +0100)
commit55865d61eda4f53658620b5239ff7af257713cdb
treeaf408c7cffde58a612d41ac1983e92250291243f
parent4c6cf62c5c574e12687922b6490ff980a1082d39
hwmon: (w83627hf) Use request_muxed_region for Super-IO accesses

[ Upstream commit e95fd518d05bfc087da6fcdea4900a57cfb083bd ]

Super-IO accesses may fail on a system with no or unmapped LPC bus.

Also, other drivers may attempt to access the LPC bus at the same time,
resulting in undefined behavior.

Use request_muxed_region() to ensure that IO access on the requested
address space is supported, and to ensure that access by multiple drivers
is synchronized.

Fixes: b72656dbc491 ("hwmon: (w83627hf) Stop using globals for I/O port numbers")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/hwmon/w83627hf.c