ide: make legacy IDE VLB modules check for the "probe" kernel params (v2)

Legacy IDE VLB host drivers didn't check for "probe" options when compiled
as modules, which was obviously wrong as we don't want module to poke at
random I/O ports by simply loading it.  Fix it by adding "probe" module param
to legacy IDE VLB host drivers.

v2:
* don't obsolete old "ide0=dtc2278/ht6560b/qd65xx/ali14xx/umc8672"
  IDE driver options yet (per Alan Cox's request) and enhance documentation

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/legacy/ali14xx.c b/drivers/ide/legacy/ali14xx.c
index f9f5b8d..91961aa 100644
--- a/drivers/ide/legacy/ali14xx.c
+++ b/drivers/ide/legacy/ali14xx.c
@@ -228,9 +228,17 @@
 	return 0;
 }
 
+int probe_ali14xx = 0;
+
+module_param_named(probe, probe_ali14xx, bool, 0);
+MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
+
 /* Can be called directly from ide.c. */
 int __init ali14xx_init(void)
 {
+	if (probe_ali14xx == 0)
+		goto out;
+
 	/* auto-detect IDE controller port */
 	if (findPort()) {
 		if (ali14xx_probe())
@@ -238,6 +246,7 @@
 		return 0;
 	}
 	printk(KERN_ERR "ali14xx: not found.\n");
+out:
 	return -ENODEV;
 }