---

yaml
---
r: 36191
b: refs/heads/master
c: 7e96287
h: refs/heads/master
i:
  36189: a32eb60
  36187: cc1c373
  36183: d39316f
  36175: 96efe71
  36159: 4864c29
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: bcdc5e019d9f525a9f181a7de642d3a9c27c7610
+refs/heads/master: 7e96287ddc4f42081e18248b6167041c0908004c

trunk/Documentation/kernel-parameters.txt

@@ -1370,6 +1370,9 @@ running once the system is up.
 			Reserves a hole at the top of the kernel virtual
 			address space.
 
+	reset_devices	[KNL] Force drivers to reset the underlying device
+			during initialization.
+
 	resume=		[SWSUSP]
 			Specify the partition device for software suspend
 

trunk/include/linux/init.h

@@ -68,6 +68,7 @@ extern initcall_t __security_initcall_start[], __security_initcall_end[];
 
 /* Defined in init/main.c */
 extern char saved_command_line[];
+extern unsigned int reset_devices;
 
 /* used by init/main.c */
 extern void setup_arch(char **);

trunk/init/main.c

@@ -127,6 +127,18 @@ static char *ramdisk_execute_command;
 /* Setup configured maximum number of CPUs to activate */
 static unsigned int max_cpus = NR_CPUS;
 
+/*
+ * If set, this is an indication to the drivers that reset the underlying
+ * device before going ahead with the initialization otherwise driver might
+ * rely on the BIOS and skip the reset operation.
+ *
+ * This is useful if kernel is booting in an unreliable environment.
+ * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
+ * skipped and devices will be in unknown state.
+ */
+unsigned int reset_devices;
+EXPORT_SYMBOL(reset_devices);
+
 /*
  * Setup routine for controlling SMP activation
  *
@@ -153,6 +165,14 @@ static int __init maxcpus(char *str)
 
 __setup("maxcpus=", maxcpus);
 
+static int __init set_reset_devices(char *str)
+{
+	reset_devices = 1;
+	return 1;
+}
+
+__setup("reset_devices", set_reset_devices);
+
 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
 char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
 static const char *panic_later, *panic_param;