2 files changed, 31 insertions, 8 deletions

diff --git a/drivers/net/wireless/iwlwifi/Kconfig b/drivers/net/wireless/iwlwifi/Kconfig
index a51e4da1bdfc..7ab5b51951ff 100644
--- a/drivers/net/wireless/iwlwifi/Kconfig
+++ b/drivers/net/wireless/iwlwifi/Kconfig
@@ -36,6 +36,12 @@ config IWLWIFI_DEBUGFS
           is a low-impact option that allows getting insight into the
           driver's state at runtime.
 
+config IWLWIFI_DEBUG_EXPERIMENTAL_UCODE
+        bool "Experimental uCode support"
+        depends on IWLWIFI && IWLWIFI_DEBUG
+        ---help---
+          Enable use of experimental ucode for testing and debugging.
+
 config IWLWIFI_DEVICE_TRACING
         bool "iwlwifi device access tracing"
         depends on IWLWIFI
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index f832535c3a47..40b82d9f309e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -1659,24 +1659,37 @@ static void iwl_ucode_callback(const struct firmware *ucode_raw, void *context);
 static int iwl_mac_setup_register(struct iwl_priv *priv,
                                   struct iwlagn_ucode_capabilities *capa);
 
+#define UCODE_EXPERIMENTAL_INDEX        100
+#define UCODE_EXPERIMENTAL_TAG          "exp"
+
 static int __must_check iwl_request_firmware(struct iwl_priv *priv, bool first)
 {
         const char *name_pre = priv->cfg->fw_name_pre;
+        char tag[8];
 
-        if (first)
+        if (first) {
+#ifdef CONFIG_IWLWIFI_DEBUG_EXPERIMENTAL_UCODE
+                priv->fw_index = UCODE_EXPERIMENTAL_INDEX;
+                strcpy(tag, UCODE_EXPERIMENTAL_TAG);
+        } else if (priv->fw_index == UCODE_EXPERIMENTAL_INDEX) {
+#endif
                 priv->fw_index = priv->cfg->ucode_api_max;
-        else
+                sprintf(tag, "%d", priv->fw_index);
+        } else {
                 priv->fw_index--;
+                sprintf(tag, "%d", priv->fw_index);
+        }
 
         if (priv->fw_index < priv->cfg->ucode_api_min) {
                 IWL_ERR(priv, "no suitable firmware found!\n");
                 return -ENOENT;
         }
 
-        sprintf(priv->firmware_name, "%s%d%s",
-                name_pre, priv->fw_index, ".ucode");
+        sprintf(priv->firmware_name, "%s%s%s", name_pre, tag, ".ucode");
 
-        IWL_DEBUG_INFO(priv, "attempting to load firmware '%s'\n",
+        IWL_DEBUG_INFO(priv, "attempting to load firmware %s'%s'\n",
+                       (priv->fw_index == UCODE_EXPERIMENTAL_INDEX)
+                                ? "EXPERIMENTAL " : "",
                        priv->firmware_name);
 
         return request_firmware_nowait(THIS_MODULE, 1, priv->firmware_name,
@@ -1971,8 +1984,10 @@ static void iwl_ucode_callback(const struct firmware *ucode_raw, void *context)
         memset(&pieces, 0, sizeof(pieces));
 
         if (!ucode_raw) {
-                IWL_ERR(priv, "request for firmware file '%s' failed.\n",
-                        priv->firmware_name);
+                if (priv->fw_index <= priv->cfg->ucode_api_max)
+                        IWL_ERR(priv,
+                                "request for firmware file '%s' failed.\n",
+                                priv->firmware_name);
                 goto try_again;
         }
 
@@ -2019,7 +2034,9 @@ static void iwl_ucode_callback(const struct firmware *ucode_raw, void *context)
                           api_max, api_ver);
 
         if (build)
-                sprintf(buildstr, " build %u", build);
+                sprintf(buildstr, " build %u%s", build,
+                       (priv->fw_index == UCODE_EXPERIMENTAL_INDEX)
+                                ? " (EXP)" : "");
         else
                 buildstr[0] = '\0';