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iwlwifi: stop dbgc recording before stopping DMA

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Today we stop the device and the DMA without stopping the dbgc
recording before. This causes host crashes when the DMA
rate is high.

Stop dbgc recording when clearing the fw debug configuration
to fix this.

Signed-off-by: Golan Ben Ami <golan.ben.ami@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Golan Ben Ami 2017-09-12 12:32:25 +03:00 committed by Luca Coelho
parent baf41bc35f
commit 1efc3843a4
2 changed files with 17 additions and 5 deletions
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7
drivers/net/wireless/intel/iwlwifi/fw/dbg.c
View File

@ -1086,7 +1086,7 @@ void iwl_fw_error_dump_wk(struct work_struct *work)
if (fwrt->trans->cfg->device_family == IWL_DEVICE_FAMILY_7000) {
/* stop recording */
iwl_set_bits_prph(fwrt->trans, MON_BUFF_SAMPLE_CTL, 0x100);
iwl_fw_dbg_stop_recording(fwrt);
iwl_fw_error_dump(fwrt);
@ -1104,10 +1104,7 @@ void iwl_fw_error_dump_wk(struct work_struct *work)
u32 in_sample = iwl_read_prph(fwrt->trans, DBGC_IN_SAMPLE);
u32 out_ctrl = iwl_read_prph(fwrt->trans, DBGC_OUT_CTRL);
/* stop recording */
iwl_write_prph(fwrt->trans, DBGC_IN_SAMPLE, 0);
udelay(100);
iwl_write_prph(fwrt->trans, DBGC_OUT_CTRL, 0);
iwl_fw_dbg_stop_recording(fwrt);
/* wait before we collect the data till the DBGC stop */
udelay(500);

15
drivers/net/wireless/intel/iwlwifi/fw/dbg.h
View File

@ -68,6 +68,8 @@
#include <linux/workqueue.h>
#include <net/cfg80211.h>
#include "runtime.h"
#include "iwl-prph.h"
#include "iwl-io.h"
#include "file.h"
#include "error-dump.h"
@ -194,8 +196,21 @@ _iwl_fw_dbg_trigger_simple_stop(struct iwl_fw_runtime *fwrt,
iwl_fw_dbg_get_trigger((fwrt)->fw,\
(trig)))
static inline void iwl_fw_dbg_stop_recording(struct iwl_fw_runtime *fwrt)
{
if (fwrt->trans->cfg->device_family == IWL_DEVICE_FAMILY_7000) {
iwl_set_bits_prph(fwrt->trans, MON_BUFF_SAMPLE_CTL, 0x100);
} else {
iwl_write_prph(fwrt->trans, DBGC_IN_SAMPLE, 0);
udelay(100);
iwl_write_prph(fwrt->trans, DBGC_OUT_CTRL, 0);
}
}
static inline void iwl_fw_dump_conf_clear(struct iwl_fw_runtime *fwrt)
{
iwl_fw_dbg_stop_recording(fwrt);
fwrt->dump.conf = FW_DBG_INVALID;
}