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hwmon: (smsc47b397) Use request_muxed_region for Super-IO accesses

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[ 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>
This commit is contained in:
Guenter Roeck 2019-04-04 11:22:42 -07:00 committed by prashantpaddune
parent 4a4fbf885a
commit c04d5e9517
1 changed files with 11 additions and 2 deletions
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13
drivers/hwmon/smsc47b397.c
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@ -72,14 +72,19 @@ static inline void superio_select(int ld)
superio_outb(0x07, ld);
}
static inline void superio_enter(void)
static inline int superio_enter(void)
{
if (!request_muxed_region(REG, 2, DRVNAME))
return -EBUSY;
outb(0x55, REG);
return 0;
}
static inline void superio_exit(void)
{
outb(0xAA, REG);
release_region(REG, 2);
}
#define SUPERIO_REG_DEVID 0x20
@ -300,8 +305,12 @@ static int __init smsc47b397_find(void)
u8 id, rev;
char *name;
unsigned short addr;
int err;
err = superio_enter();
if (err)
return err;
superio_enter();
id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
switch (id) {