From 62d7476d958ce06d7a10b02bdb30006870286fe2 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Tue, 5 Jan 2016 15:25:43 +0200 Subject: [PATCH] iwlwifi: pcie: properly configure the debug buffer size for 8000 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: [4.1+] Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index 3a4310917978..d60a467a983c 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/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 @@ 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); - 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); } }