iwlwifi: pnvm: don't try to load after failures

If loading the PNVM file failed on the first try during the
interface up, the file is unlikely to show up later, and we
already don't try to reload it if it changes, so just don't
try loading it again and again.

This also fixes some issues where we may try to load it at
resume time, which may not be possible yet.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Fixes: 69725928 ("iwlwifi: read and parse PNVM file")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20210115130252.5ac6828a0bbe.I7d308358b21d3c0c84b1086999dbc7267f86e219@changeid

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

@@ -232,7 +232,7 @@ int iwl_pnvm_load(struct iwl_trans *trans,
 	if (!trans->sku_id[0] && !trans->sku_id[1] && !trans->sku_id[2])
 		return 0;
 
-	/* load from disk only if we haven't done it before */
+	/* load from disk only if we haven't done it (or tried) before */
 	if (!trans->pnvm_loaded) {
 		const struct firmware *pnvm;
 		char pnvm_name[64];
@@ -253,6 +253,12 @@ int iwl_pnvm_load(struct iwl_trans *trans,
 		if (ret) {
 			IWL_DEBUG_FW(trans, "PNVM file %s not found %d\n",
 				     pnvm_name, ret);
+			/*
+			 * Pretend we've loaded it - at least we've tried and
+			 * couldn't load it at all, so there's no point in
+			 * trying again over and over.
+			 */
+			trans->pnvm_loaded = true;
 		} else {
 			iwl_pnvm_parse(trans, pnvm->data, pnvm->size);