linux-kernel - [PATCH 4.9 06/74] i2c: i801: Save register SMBSLVCMD value only once

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Date:   Fri, 27 Apr 2018 15:57:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jean Delvare <jdelvare@...e.de>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jason Andryuk <jandryuk@...il.com>,
        Wolfram Sang <wsa@...-dreams.de>
Subject: [PATCH 4.9 06/74] i2c: i801: Save register SMBSLVCMD value only once

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jean Delvare <jdelvare@...e.de>

commit a086bb8317303dd74725dca933b9b29575159382 upstream.

Saving the original value of register SMBSLVCMD in
i801_enable_host_notify() doesn't work, because this function is
called not only at probe time but also at resume time. Do it in
i801_probe() instead, so that the saved value is not overwritten at
resume time.

Signed-off-by: Jean Delvare <jdelvare@...e.de>
Fixes: 22e94bd6779e ("i2c: i801: store and restore the SLVCMD register at load and unload")
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Tested-by: Jason Andryuk <jandryuk@...il.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Cc: stable@...r.kernel.org	# v4.10+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/i2c/busses/i2c-i801.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -963,8 +963,6 @@ static int i801_enable_host_notify(struc
 	if (!priv->host_notify)
 		return -ENOMEM;
 
-	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));
@@ -1603,6 +1601,10 @@ static int i801_probe(struct pci_dev *de
 		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;