iwlwifi: yoyo: don't allow changing the domain via debugfs

We don't want to allow changing the domain via debugfs so that we can
apply the domain to all TLV types more easily (doing some at runtime
is difficult due to buffer allocations etc.).  Change the
fw_dbg_domain debugfs file to be read-only and remove the write
function.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

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

@@ -320,31 +320,6 @@ out:
 
 FWRT_DEBUGFS_WRITE_FILE_OPS(send_hcmd, 512);
 
-static ssize_t iwl_dbgfs_fw_dbg_domain_write(struct iwl_fw_runtime *fwrt,
-					     char *buf, size_t count)
-{
-	u32 new_domain;
-	int ret;
-
-	if (!iwl_trans_fw_running(fwrt->trans))
-		return -EIO;
-
-	ret = kstrtou32(buf, 0, &new_domain);
-	if (ret)
-		return ret;
-
-	if (new_domain != fwrt->trans->dbg.domains_bitmap) {
-		ret = iwl_dbg_tlv_gen_active_trigs(fwrt, new_domain);
-		if (ret)
-			return ret;
-
-		iwl_dbg_tlv_time_point(fwrt, IWL_FW_INI_TIME_POINT_PERIODIC,
-				       NULL);
-	}
-
-	return count;
-}
-
 static ssize_t iwl_dbgfs_fw_dbg_domain_read(struct iwl_fw_runtime *fwrt,
 					    size_t size, char *buf)
 {
@@ -352,7 +327,7 @@ static ssize_t iwl_dbgfs_fw_dbg_domain_read(struct iwl_fw_runtime *fwrt,
 			 fwrt->trans->dbg.domains_bitmap);
 }
 
-FWRT_DEBUGFS_READ_WRITE_FILE_OPS(fw_dbg_domain, 20);
+FWRT_DEBUGFS_READ_FILE_OPS(fw_dbg_domain, 20);
 
 void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
 			    struct dentry *dbgfs_dir)
@@ -360,5 +335,5 @@ void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
 	INIT_DELAYED_WORK(&fwrt->timestamp.wk, iwl_fw_timestamp_marker_wk);
 	FWRT_DEBUGFS_ADD_FILE(timestamp_marker, dbgfs_dir, 0200);
 	FWRT_DEBUGFS_ADD_FILE(send_hcmd, dbgfs_dir, 0200);
-	FWRT_DEBUGFS_ADD_FILE(fw_dbg_domain, dbgfs_dir, 0600);
+	FWRT_DEBUGFS_ADD_FILE(fw_dbg_domain, dbgfs_dir, 0400);
 }