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@xxxxxxxxxx>
Reported-by: John Garry <john.garry@xxxxxxxxxx>
Cc: John Garry <john.garry@xxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
drivers/hwmon/f71805f.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/hwmon/f71805f.c b/drivers/hwmon/f71805f.c
index 73c681162653..623736d2a7c1 100644
--- a/drivers/hwmon/f71805f.c
+++ b/drivers/hwmon/f71805f.c
@@ -96,17 +96,23 @@ superio_select(int base, int ld)
outb(ld, base + 1);
}
-static inline void
+static inline int
superio_enter(int base)
{
+ if (!request_muxed_region(base, 2, DRVNAME))
+ return -EBUSY;
+
outb(0x87, base);
outb(0x87, base);
+
+ return 0;
}
static inline void
superio_exit(int base)
{
outb(0xaa, base);
+ release_region(base, 2);
}
/*
@@ -1561,7 +1567,7 @@ static int __init f71805f_device_add(unsigned short address,
static int __init f71805f_find(int sioaddr, unsigned short *address,
struct f71805f_sio_data *sio_data)
{
- int err = -ENODEV;
+ int err;
u16 devid;
static const char * const names[] = {
@@ -1569,8 +1575,11 @@ static int __init f71805f_find(int sioaddr, unsigned short *address,
"F71872F/FG or F71806F/FG",
};
- superio_enter(sioaddr);
+ err = superio_enter(sioaddr);
+ if (err)
+ return err;
+ err = -ENODEV;
devid = superio_inw(sioaddr, SIO_REG_MANID);
if (devid != SIO_FINTEK_ID)
goto exit;
--
2.7.4
