[PATCH] EISA: avoid unnecessary probing

- By default, do not try to probe the bus if the mainboard does not
  seems to support EISA (allow this behaviour to be changed through a
  command-line option).

drivers/eisa/virtual_root.c

@@ -7,12 +7,22 @@
  * This code is released under the GPL version 2.
  */
 
+#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/eisa.h>
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/init.h>
 
+#if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING)
+#define EISA_FORCE_PROBE_DEFAULT 1
+#else
+#define EISA_FORCE_PROBE_DEFAULT 0
+#endif
+
+static int force_probe = EISA_FORCE_PROBE_DEFAULT;
+
 /* The default EISA device parent (virtual root device).
  * Now use a platform device, since that's the obvious choice. */
 
@@ -29,6 +39,7 @@ static struct eisa_root_device eisa_bus_root = {
 	.bus_base_addr = 0,
 	.res	       = &ioport_resource,
 	.slots	       = EISA_MAX_SLOTS,
+	.dma_mask      = 0xffffffff,
 };
 
 static int virtual_eisa_root_init (void)
@@ -39,6 +50,8 @@ static int virtual_eisa_root_init (void)
                 return r;
         }
 
+	eisa_bus_root.force_probe = force_probe;
+	
 	eisa_root_dev.dev.driver_data = &eisa_bus_root;
 
 	if (eisa_root_register (&eisa_bus_root)) {
@@ -51,4 +64,6 @@ static int virtual_eisa_root_init (void)
 	return 0;
 }
 
+module_param (force_probe, int, 0444);
+
 device_initcall (virtual_eisa_root_init);