]> git.ipfire.org Git - thirdparty/kernel/stable.git/commit
hwmon: (smsc47b397) Use request_muxed_region for Super-IO accesses
authorGuenter Roeck <linux@roeck-us.net>
Thu, 4 Apr 2019 18:22:42 +0000 (11:22 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 31 May 2019 13:45:06 +0000 (06:45 -0700)
commit860156471f53e6c189a16ea5a916bd8fb24fb65d
tree278f6029360cb9460fc39dbb4807c71e498c0ab7
parenta4f828b02b014daa86e73073b806e9c03eb58505
hwmon: (smsc47b397) Use request_muxed_region for Super-IO accesses

[ Upstream commit 8c0826756744c0ac1df600a5e4cca1a341b13101 ]

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: 8d5d45fb1468 ("I2C: Move hwmon drivers (2/3)")
Reported-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reported-by: John Garry <john.garry@huawei.com>
Cc: John Garry <john.garry@huawei.com>
Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/hwmon/smsc47b397.c