[SCSI] mpt fusion: make logging a global sysfs parameter

Wire up the mpt_debug_level module parameter so you can write to the
/sys/module/mptbase/parameters/mpt_debug_level and have it take effect
in every ioc.
Acked-by: "Moore, Eric" <Eric.Moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/message/fusion/mptbase.c

@@ -88,7 +88,9 @@ module_param(mpt_channel_mapping, int, 0);
 MODULE_PARM_DESC(mpt_channel_mapping, " Mapping id's to channels (default=0)");
 
 static int mpt_debug_level;
-module_param(mpt_debug_level, int, 0);
+static int mpt_set_debug_level(const char *val, struct kernel_param *kp);
+module_param_call(mpt_debug_level, mpt_set_debug_level, param_get_int,
+		  &mpt_debug_level, 0600);
 MODULE_PARM_DESC(mpt_debug_level, " debug level - refer to mptdebug.h - (default=0)");
 
 #ifdef MFCNT
@@ -220,6 +222,19 @@ pci_enable_io_access(struct pci_dev *pdev)
 	pci_write_config_word(pdev, PCI_COMMAND, command_reg);
 }
 
+static int mpt_set_debug_level(const char *val, struct kernel_param *kp)
+{
+	int ret = param_set_int(val, kp);
+	MPT_ADAPTER *ioc;
+
+	if (ret)
+		return ret;
+
+	list_for_each_entry(ioc, &ioc_list, list)
+		ioc->debug_level = mpt_debug_level;
+	return 0;
+}
+
 /*
  *  Process turbo (context) reply...
  */