[Suspend2][ 06/19] [Suspend2] Initialise modules before doing I/O.

[Nigel Cunningham <nigel@suspend2.net>]

Add a routine to initialise modules in preparation for reading or writing a
portion of the image proper (not used for the header).

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/io.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/kernel/power/io.c b/kernel/power/io.c
index b3a997f..401789d 100644
--- a/kernel/power/io.c
+++ b/kernel/power/io.c
@@ -161,3 +161,48 @@ static void fill_suspend_header(struct s
 		       suspend_io_time[i/2][i%2];
 }
 
+/*
+ * rw_init_modules
+ *
+ * Iterate over modules, preparing the ones that will be used to read or write
+ * data.
+ */
+static int rw_init_modules(int rw, int which)
+{
+	struct suspend_module_ops *this_module;
+	/* Initialise page transformers */
+	list_for_each_entry(this_module, &suspend_filters, type_list) {
+		if (this_module->disabled)
+			continue;
+		if (this_module->rw_init &&
+		     	this_module->rw_init(rw, which)) {
+			abort_suspend("Failed to initialise the %s filter.",
+				this_module->name);
+				return 1;
+		}
+	}
+
+	/* Initialise writer */
+	if (suspend_active_writer->rw_init(rw, which)) {
+		abort_suspend("Failed to initialise the writer."); 
+		if (!rw)
+			suspend_active_writer->invalidate_image();
+		return 1;
+	}
+
+	/* Initialise other modules */
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (this_module->disabled)
+			continue;
+		if ((this_module->type == FILTER_MODULE) ||
+		    (this_module->type == WRITER_MODULE))
+			continue;
+		if (this_module->rw_init && this_module->rw_init(rw, which)) {
+				set_result_state(SUSPEND_ABORTED);
+				return 1;
+			}
+	}
+
+	return 0;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
-
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