powerpc/powernv: Skip registering log region when CONFIG_PRINTK=n

When CONFIG_PRINTK=n, log_buf_addr_get() returns NULL and log_buf_len_get() return 0. Check for these return values and skip registering the dump buffer. Signed-off-by: Pranith Kumar <[email protected]> Reviewed-by: Stewart Smith <[email protected]> Signed-off-by: Michael Ellerman <[email protected]>
cluon · Jan 27, 2015 · 6501ab5 · 6501ab5
1 parent 3df76a9
commit 6501ab5
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
@@ -667,7 +667,13 @@ static void __init opal_dump_region_init(void)
 
 	/* Register kernel log buffer */
 	addr = log_buf_addr_get();
+	if (addr == NULL)
+		return;
+
 	size = log_buf_len_get();
+	if (size == 0)
+		return;
+
 	rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
 				       __pa(addr), size);
 	/* Don't warn if this is just an older OPAL that doesn't