4.14-stable review patch. If anyone has any objections, please let me know.
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From: Jean Delvare jdelvare@suse.de
commit f7f6d915a10f7f2bce17e3b1b7d3376562395a28 upstream.
On some systems, the BIOS expects certain SMBus register values to match the hardware defaults. Restore these configuration registers at shutdown time to avoid confusing the BIOS. This avoids hard-locking such systems upon reboot.
Signed-off-by: Jean Delvare jdelvare@suse.de Tested-by: Jason Andryuk jandryuk@gmail.com Signed-off-by: Wolfram Sang wsa@the-dreams.de Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/i2c/busses/i2c-i801.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
--- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -1700,6 +1700,15 @@ static void i801_remove(struct pci_dev * */ }
+static void i801_shutdown(struct pci_dev *dev) +{ + struct i801_priv *priv = pci_get_drvdata(dev); + + /* Restore config registers to avoid hard hang on some systems */ + i801_disable_host_notify(priv); + pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg); +} + #ifdef CONFIG_PM static int i801_suspend(struct device *dev) { @@ -1729,6 +1738,7 @@ static struct pci_driver i801_driver = { .id_table = i801_ids, .probe = i801_probe, .remove = i801_remove, + .shutdown = i801_shutdown, .driver = { .pm = &i801_pm_ops, },