Patch "watchdog: sp5100_tco: properly check for new register layouts" has been added to the 4.5-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    watchdog: sp5100_tco: properly check for new register layouts

to the 4.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     watchdog-sp5100_tco-properly-check-for-new-register-layouts.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 46856fabe40cc80f92134683cdec7dc0fc8f4000 Mon Sep 17 00:00:00 2001
From: Lucas Stach <dev@lynxeye.de>
Date: Tue, 3 May 2016 19:15:58 +0200
Subject: watchdog: sp5100_tco: properly check for new register layouts

From: Lucas Stach <dev@lynxeye.de>

commit 46856fabe40cc80f92134683cdec7dc0fc8f4000 upstream.

Commits 190aa4304de6 (Add AMD Mullins platform support) and
cca118fa2a0a94 (Add AMD Carrizo platform support) enabled the
driver on a lot more devices, but the following commit missed
a single location in the code when checking if the SB800 register
offsets should be used. This leads to the wrong register being
written which in turn causes ACPI to go haywire.

Fix this by introducing a helper function to check for the new
register layout and use this consistently.

https://bugzilla.kernel.org/show_bug.cgi?id=114201
https://bugzilla.redhat.com/show_bug.cgi?id=1329910
Fixes: bdecfcdb5461 (sp5100_tco: fix the device check for SB800
and later chipsets)
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/watchdog/sp5100_tco.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -73,6 +73,13 @@ MODULE_PARM_DESC(nowayout, "Watchdog can
 /*
  * Some TCO specific functions
  */
+
+static bool tco_has_sp5100_reg_layout(struct pci_dev *dev)
+{
+	return dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
+	       dev->revision < 0x40;
+}
+
 static void tco_timer_start(void)
 {
 	u32 val;
@@ -129,7 +136,7 @@ static void tco_timer_enable(void)
 {
 	int val;
 
-	if (sp5100_tco_pci->revision >= 0x40) {
+	if (!tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
 		/* For SB800 or later */
 		/* Set the Watchdog timer resolution to 1 sec */
 		outb(SB800_PM_WATCHDOG_CONFIG, SB800_IO_PM_INDEX_REG);
@@ -342,8 +349,7 @@ static unsigned char sp5100_tco_setupdev
 	/*
 	 * Determine type of southbridge chipset.
 	 */
-	if (sp5100_tco_pci->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
-	    sp5100_tco_pci->revision < 0x40) {
+	if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
 		dev_name = SP5100_DEVNAME;
 		index_reg = SP5100_IO_PM_INDEX_REG;
 		data_reg = SP5100_IO_PM_DATA_REG;
@@ -388,8 +394,7 @@ static unsigned char sp5100_tco_setupdev
 	 * Secondly, Find the watchdog timer MMIO address
 	 * from SBResource_MMIO register.
 	 */
-	if (sp5100_tco_pci->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
-	    sp5100_tco_pci->revision < 0x40) {
+	if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
 		/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
 		pci_read_config_dword(sp5100_tco_pci,
 				      SP5100_SB_RESOURCE_MMIO_BASE, &val);


Patches currently in stable-queue which might be from dev@lynxeye.de are

queue-4.5/watchdog-sp5100_tco-properly-check-for-new-register-layouts.patch