Add core routine that attempts to parse the resume2= parameter by asking
each enabled writer whether it considers the resume2= value to have
provided it with a usable configuration. If a driver returns success,
it is made the active writer and the 'we-can-try-to-resume' flag is set.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/io.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 75 insertions(+), 0 deletions(-)
diff --git a/kernel/power/io.c b/kernel/power/io.c
index df0ec8d..52f538d 100644
--- a/kernel/power/io.c
+++ b/kernel/power/io.c
@@ -29,3 +29,78 @@
#include "prepare_image.h"
#include "extent.h"
+/* suspend_attempt_to_parse_resume_device
+ *
+ * Can we suspend, using the current resume2= parameter?
+ */
+int suspend_attempt_to_parse_resume_device(void)
+{
+ struct list_head *writer;
+ struct suspend_module_ops *this_writer;
+ int result, returning = 0;
+
+ if (suspend_activate_storage(0))
+ return 0;
+
+ suspend_active_writer = NULL;
+ clear_suspend_state(SUSPEND_RESUME_DEVICE_OK);
+ clear_suspend_state(SUSPEND_CAN_RESUME);
+ clear_result_state(SUSPEND_ABORTED);
+
+ if (!suspend_num_writers) {
+ printk(name_suspend "No writers have been registered. Suspending will be disabled.\n");
+ goto cleanup;
+ }
+
+ if (!resume2_file[0]) {
+ printk(name_suspend "Resume2 parameter is empty. Suspending will be disabled.\n");
+ goto cleanup;
+ }
+
+ list_for_each(writer, &suspend_writers) {
+ this_writer = list_entry(writer, struct suspend_module_ops, type_list);
+
+ /*
+ * Not sure why you'd want to disable a writer, but
+ * we should honour the flag if we're providing it
+ */
+ if (this_writer->disabled) {
+ printk(name_suspend
+ "Writer '%s' is disabled. Ignoring it.\n",
+ this_writer->name);
+ continue;
+ }
+
+ result = this_writer->parse_sig_location(
+ resume2_file, (suspend_num_writers == 1));
+
+ switch (result) {
+ case -EINVAL:
+ /*
+ * For this writer, but not a valid
+ * configuration. Error already printed.
+ */
+
+ goto cleanup;
+
+ case 0:
+ /*
+ * For this writer and valid.
+ */
+
+ suspend_active_writer = this_writer;
+
+ set_suspend_state(SUSPEND_RESUME_DEVICE_OK);
+ set_suspend_state(SUSPEND_CAN_RESUME);
+ printk(name_suspend "Resuming enabled.\n");
+
+ returning = 1;
+ goto cleanup;
+ }
+ }
+ printk(name_suspend "No matching enabled writer found. Resuming disabled.\n");
+cleanup:
+ suspend_deactivate_storage(0);
+ return returning;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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