[PATCH v1 04/21] dl: provide a fake grub_dl_set_persistent for the emu target

[Sudhakar Kuppusamy]

From: Daniel Axtens <dja@axtens.net>

Trying to start grub-emu with a module that calls grub_dl_set_persistent
will crash because grub-emu fakes modules and passes NULL to the module
init function.

Provide an empty function for the emu case.

Fixes: ee7808e2197c (dl: Add support for persistent modules)
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
---
 include/grub/dl.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/grub/dl.h b/include/grub/dl.h
index 750fc8d3d..fb4476797 100644
--- a/include/grub/dl.h
+++ b/include/grub/dl.h
@@ -242,11 +242,22 @@ grub_dl_get (const char *name)
   return 0;
 }
 
+#ifdef GRUB_MACHINE_EMU
+/*
+ * Under grub-emu, modules are faked and NULL is passed to GRUB_MOD_INIT.
+ * So we fake this out to avoid a NULL deref.
+ */
+static inline void
+grub_dl_set_persistent (grub_dl_t mod __attribute__((unused)))
+{
+}
+#else
 static inline void
 grub_dl_set_persistent (grub_dl_t mod)
 {
   mod->persistent = 1;
 }
+#endif
 
 static inline int
 grub_dl_is_persistent (grub_dl_t mod)
-- 
2.43.5