[PATCH 5.0 182/346] hwmon: (smsc47b397) Use request_muxed_region for Super-IO accesses

[Greg Kroah-Hartman]

[ 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.w...@huawei.com>
Reported-by: John Garry <john.ga...@huawei.com>
Cc: John Garry <john.ga...@huawei.com>
Acked-by: John Garry <john.ga...@huawei.com>
Signed-off-by: Guenter Roeck <li...@roeck-us.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/hwmon/smsc47b397.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/smsc47b397.c b/drivers/hwmon/smsc47b397.c
index 6bd2007565603..cbdb5c4991ae3 100644
--- a/drivers/hwmon/smsc47b397.c
+++ b/drivers/hwmon/smsc47b397.c
@@ -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) {
-- 
2.20.1