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| /openbmc/linux/drivers/i2c/busses/ |
| H A D | i2c-piix4.c | a28e3517 Fri Jan 22 07:12:02 CST 2016 Jean Delvare <jdelvare@suse.de> i2c: piix4: Fix SB800 locking
We need a single mutex for all 4 shared SMBus ports on the SB800. A
per-port mutex doesn't protect us from concurrent access.
In theory the mutex should be per PCI device, however in practice we
know that there's only ever a single instance of the device in a given
system so we can use a global.
Also take the mutex during initialization, as first port may be already
in use when second port is initialized.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Christian Fetzer <fetzer.ch@gmail.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[wsa: made mutex static]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
a28e3517 Fri Jan 22 07:12:02 CST 2016 Jean Delvare <jdelvare@suse.de> i2c: piix4: Fix SB800 locking
We need a single mutex for all 4 shared SMBus ports on the SB800. A
per-port mutex doesn't protect us from concurrent access.
In theory the mutex should be per PCI device, however in practice we
know that there's only ever a single instance of the device in a given
system so we can use a global.
Also take the mutex during initialization, as first port may be already
in use when second port is initialized.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Christian Fetzer <fetzer.ch@gmail.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[wsa: made mutex static]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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