hwmon: (f71805f) Use request_muxed_region for Super-IO accesses
[ Upstream commit 73e6ff71a7ea924fb7121d576a2d41e3be3fc6b5 ] Super-IO accesses may fail on a system with no or unmapped LPC bus. Unable to handle kernel paging request at virtual address ffffffbffee0002e pgd = ffffffc1d68d4000 [ffffffbffee0002e] *pgd=0000000000000000, *pud=0000000000000000 Internal error: Oops: 94000046 [#1] PREEMPT SMP Modules linked in: f71805f(+) hwmon CPU: 3 PID: 1659 Comm: insmod Not tainted 4.5.0+ #88 Hardware name: linux,dummy-virt (DT) task: ffffffc1f6665400 ti: ffffffc1d6418000 task.ti: ffffffc1d6418000 PC is at f71805f_find+0x6c/0x358 [f71805f] 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: e53004e2 ("hwmon: New f71805f driver") Reported-by: NKefeng Wang <wangkefeng.wang@huawei.com> Reported-by: NJohn Garry <john.garry@huawei.com> Cc: John Garry <john.garry@huawei.com> Acked-by: NJohn Garry <john.garry@huawei.com> Signed-off-by: NGuenter Roeck <linux@roeck-us.net> Signed-off-by: NSasha Levin <sashal@kernel.org>
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