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

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[ Upstream commit 62d7476d95 ]

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.

CC: <stable@vger.kernel.org> [4.1+]
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
This commit is contained in:
Emmanuel Grumbach
2016-01-05 15:25:43 +02:00
committed by Sasha Levin
parent 01999150f5
commit d9d42b679e
2 changed files with 2729 additions and 3 deletions
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2717
drivers/net/wireless/intel/iwlwifi/pcie/trans.c Normal file
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11
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
@@ -881,9 +883,16 @@ static void iwl_pcie_apply_destination(struct iwl_trans *trans)
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);
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) >> dest->end_shift);
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);
}
}