Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull more i2c updates from Wolfram Sang:

 - hot bugfix for i801 to make laptops with strange BIOS reboot again
   when using SMBUS Host notify

 - change to MAINTAINERS creating a specific fallback entry for I2C host
   drivers and settings its status to "Odd fixes"

 - a long overdue param checking for the I2C core

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: add param sanity check to i2c_transfer()
  MAINTAINERS: add maintainer for Renesas I2C related drivers
  MAINTAINERS: remove me as maintainer for I2C host drivers
  i2c: i801: Restore configuration at shutdown
  i2c: i801: Save register SMBSLVCMD value only once

3 files changed, 47 insertions, 6 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 73d83416d852..f79952e6f627 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5911,6 +5911,11 @@ S:	Supported
 F:	drivers/phy/
 F:	include/linux/phy/
 
+GENERIC PINCTRL I2C DEMULTIPLEXER DRIVER
+M:	Wolfram Sang <wsa+renesas@sang-engineering.com>
+S:	Supported
+F:	drivers/i2c/muxes/i2c-demux-pinctrl.c
+
 GENERIC PM DOMAINS
 M:	"Rafael J. Wysocki" <rjw@rjwysocki.net>
 M:	Kevin Hilman <khilman@kernel.org>
@@ -6586,15 +6591,25 @@ W:	https://i2c.wiki.kernel.org/
 Q:	https://patchwork.ozlabs.org/project/linux-i2c/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git
 S:	Maintained
-F:	Documentation/devicetree/bindings/i2c/
+F:	Documentation/devicetree/bindings/i2c/i2c.txt
 F:	Documentation/i2c/
-F:	drivers/i2c/
-F:	drivers/i2c/*/
+F:	drivers/i2c/*
 F:	include/linux/i2c.h
-F:	include/linux/i2c-*.h
+F:	include/linux/i2c-dev.h
+F:	include/linux/i2c-smbus.h
 F:	include/uapi/linux/i2c.h
 F:	include/uapi/linux/i2c-*.h
 
+I2C SUBSYSTEM HOST DRIVERS
+L:	linux-i2c@vger.kernel.org
+W:	https://i2c.wiki.kernel.org/
+Q:	https://patchwork.ozlabs.org/project/linux-i2c/list/
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git
+S:	Odd Fixes
+F:	Documentation/devicetree/bindings/i2c/
+F:	drivers/i2c/algos/
+F:	drivers/i2c/busses/
+
 I2C-TAOS-EVM DRIVER
 M:	Jean Delvare <jdelvare@suse.com>
 L:	linux-i2c@vger.kernel.org
@@ -11906,6 +11921,11 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git c
 S:	Supported
 F:	drivers/clk/renesas/
 
+RENESAS EMEV2 I2C DRIVER
+M:	Wolfram Sang <wsa+renesas@sang-engineering.com>
+S:	Supported
+F:	drivers/i2c/busses/i2c-emev2.c
+
 RENESAS ETHERNET DRIVERS
 R:	Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
 L:	netdev@vger.kernel.org
@@ -11921,6 +11941,12 @@ L:	linux-iio@vger.kernel.org
 S:	Supported
 F:	drivers/iio/adc/rcar_gyro_adc.c
 
+RENESAS R-CAR I2C DRIVERS
+M:	Wolfram Sang <wsa+renesas@sang-engineering.com>
+S:	Supported
+F:	drivers/i2c/busses/i2c-rcar.c
+F:	drivers/i2c/busses/i2c-sh_mobile.c
+
 RENESAS USB PHY DRIVER
 M:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
 L:	linux-renesas-soc@vger.kernel.org
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 692b34125866..e0d59e9ff3c6 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -966,8 +966,6 @@ static void i801_enable_host_notify(struct i2c_adapter *adapter)
 	if (!(priv->features & FEATURE_HOST_NOTIFY))
 		return;
 
-	priv->original_slvcmd = inb_p(SMBSLVCMD(priv));
-
 	if (!(SMBSLVCMD_HST_NTFY_INTREN & priv->original_slvcmd))
 		outb_p(SMBSLVCMD_HST_NTFY_INTREN | priv->original_slvcmd,
 		       SMBSLVCMD(priv));
@@ -1615,6 +1613,10 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		outb_p(inb_p(SMBAUXCTL(priv)) &
 		       ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
 
+	/* Remember original Host Notify setting */
+	if (priv->features & FEATURE_HOST_NOTIFY)
+		priv->original_slvcmd = inb_p(SMBSLVCMD(priv));
+
 	/* Default timeout in interrupt mode: 200 ms */
 	priv->adapter.timeout = HZ / 5;
 
@@ -1699,6 +1701,15 @@ static void i801_remove(struct pci_dev *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)
 {
@@ -1728,6 +1739,7 @@ static struct pci_driver i801_driver = {
 	.id_table	= i801_ids,
 	.probe		= i801_probe,
 	.remove		= i801_remove,
+	.shutdown	= i801_shutdown,
 	.driver		= {
 		.pm	= &i801_pm_ops,
 	},
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 1adeebaa81b0..1ba40bb2b966 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1845,6 +1845,9 @@ int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 	unsigned long orig_jiffies;
 	int ret, try;
 
+	if (WARN_ON(!msgs || num < 1))
+		return -EINVAL;
+
 	if (adap->quirks && i2c_check_for_quirks(adap, msgs, num))
 		return -EOPNOTSUPP;