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

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commit 62d7476d95 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>
This commit is contained in:
Emmanuel Grumbach
2016-01-05 15:25:43 +02:00
committed by Greg Kroah-Hartman
parent d19573e849
commit 8a55831546
1 changed files with 12 additions and 3 deletions
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15
drivers/net/wireless/iwlwifi/pcie/trans.c
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@@ -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);
}
}