Patch "iwlwifi: pcie: properly configure the debug buffer size for 8000" has been added to the 4.4-stable tree

Patch "iwlwifi: pcie: properly configure the debug buffer size for 8000" has been added to the 4.4-stable tree

[gregkh]

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

    iwlwifi: pcie: properly configure the debug buffer size for 8000

to the 4.4-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:
     iwlwifi-pcie-properly-configure-the-debug-buffer-size-for-8000.patch
and it can be found in the queue-4.4 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 62d7476d958ce06d7a10b02bdb30006870286fe2 Mon Sep 17 00:00:00 2001
From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Tue, 5 Jan 2016 15:25:43 +0200
Subject: iwlwifi: pcie: properly configure the debug buffer size for 8000

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

commit 62d7476d958ce06d7a10b02bdb30006870286fe2 upstream.

8000 device family has a new debug engine that needs to be
configured differently than 7000's.
The debug engine's DMA works in chunks of memory and the
size of the buffer really means the start of the last
chunk. Since one chunk is 256-byte long, we should
configure the device to write to buffer_size - 256.
This fixes a situation were the device would write to
memory it is not allowed to access.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/iwlwifi/pcie/trans.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -7,6 +7,7 @@
  *
  * Copyright(c) 2007 - 2015 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
+ * Copyright(c) 2016 Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -33,6 +34,7 @@
  *
  * Copyright(c) 2005 - 2015 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
+ * Copyright(c) 2016 Intel Deutschland GmbH
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -924,9 +926,16 @@ monitor:
 	if (dest->monitor_mode == EXTERNAL_MODE && trans_pcie->fw_mon_size) {
 		iwl_write_prph(trans, le32_to_cpu(dest->base_reg),
 			       trans_pcie->fw_mon_phys >> dest->base_shift);
-		iwl_write_prph(trans, le32_to_cpu(dest->end_reg),
-			       (trans_pcie->fw_mon_phys +
-				trans_pcie->fw_mon_size) >> dest->end_shift);
+		if (trans->cfg->device_family == IWL_DEVICE_FAMILY_8000)
+			iwl_write_prph(trans, le32_to_cpu(dest->end_reg),
+				       (trans_pcie->fw_mon_phys +
+					trans_pcie->fw_mon_size - 256) >>
+						dest->end_shift);
+		else
+			iwl_write_prph(trans, le32_to_cpu(dest->end_reg),
+				       (trans_pcie->fw_mon_phys +
+					trans_pcie->fw_mon_size) >>
+						dest->end_shift);
 	}
 }
 


Patches currently in stable-queue which might be from emmanuel.grumbach@intel.com are

queue-4.4/iwlwifi-mvm-don-t-allow-sched-scans-without-matches-to-be-started.patch
queue-4.4/iwlwifi-update-and-fix-7265-series-pci-ids.patch
queue-4.4/iwlwifi-dvm-fix-wowlan.patch
queue-4.4/iwlwifi-pcie-properly-configure-the-debug-buffer-size-for-8000.patch