efi: don't log if EFI RNG isn't ready

Apparently this happens IRL on some systems, let's handle this
gracefully and don't log.

Fixes: #35033

src/boot/log.h

@@ -27,6 +27,7 @@ _gnu_printf_(3, 4) EFI_STATUS log_internal(EFI_STATUS status, uint8_t text_color
         log_internal(status, text_color, "%s:%i@%s: " format, __FILE__, __LINE__, __func__, ##__VA_ARGS__)
 #define log_debug(...) log_full(EFI_SUCCESS, EFI_LIGHTGRAY, __VA_ARGS__)
 #define log_info(...) log_full(EFI_SUCCESS, EFI_WHITE, __VA_ARGS__)
+#define log_warning_status(status, ...) log_full(status, EFI_YELLOW, __VA_ARGS__)
 #define log_error_status(status, ...) log_full(status, EFI_LIGHTRED, __VA_ARGS__)
 #define log_error(...) log_full(EFI_INVALID_PARAMETER, EFI_LIGHTRED, __VA_ARGS__)
 #define log_oom() log_full(EFI_OUT_OF_RESOURCES, EFI_LIGHTRED, "Out of memory.")

src/boot/random-seed.c

@@ -43,8 +43,11 @@ static EFI_STATUS acquire_rng(void *ret, size_t size) {
                 return EFI_UNSUPPORTED;
 
         err = rng->GetRNG(rng, NULL, size, ret);
+        /* On some systems the RNG might not be ready during early boot, handle gracefully and don't log. */
+        if (err == EFI_NOT_READY)
+                return err;
         if (err != EFI_SUCCESS)
-                return log_error_status(err, "Failed to acquire RNG data: %m");
+                return log_warning_status(err, "Failed to acquire RNG data, proceeding without: %m");
         return EFI_SUCCESS;
 }