iwlwifi: stop dbgc recording before stopping DMA

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>

drivers/net/wireless/intel/iwlwifi/fw/dbg.c

@@ -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);
 

drivers/net/wireless/intel/iwlwifi/fw/dbg.h

@@ -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;
 }