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| author | Guenter Roeck <linux@roeck-us.net> | 2019-04-04 20:52:43 +0300 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2019-04-16 03:19:53 +0300 |
| commit | 73e6ff71a7ea924fb7121d576a2d41e3be3fc6b5 (patch) | |
| tree | 2ec2ad53703c91a3409f8df0892f91a2e5149411 /drivers/hwmon/pc87427.c | |
| parent | df6b8c70c2109d2221592954aacd67a2ad2f696e (diff) | |
| download | linux-73e6ff71a7ea924fb7121d576a2d41e3be3fc6b5.tar.xz | |
hwmon: (f71805f) Use request_muxed_region for Super-IO accesses
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: e53004e20a58e ("hwmon: New f71805f driver")
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>
Diffstat (limited to 'drivers/hwmon/pc87427.c')
0 files changed, 0 insertions, 0 deletions