Wait for all outstanding I/O to complete, then clean it all up and free the
io_info structs.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/suspend_block_io.c | 42 +++++++++++++++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
index 6f8b29e..5b93ad2 100644
--- a/kernel/power/suspend_block_io.c
+++ b/kernel/power/suspend_block_io.c
@@ -333,3 +333,45 @@ static void do_bio_wait(int caller)
suspend_cleanup_some_completed_io();
}
+/*
+ * suspend_finish_all_io
+ *
+ * Description: Finishes all IO and frees all IO info struct pages.
+ */
+static void suspend_finish_all_io(void)
+{
+ struct io_info *this, *next = NULL;
+ unsigned long flags;
+
+ /* Wait for all I/O to complete. */
+ while (atomic_read(&outstanding_io))
+ do_bio_wait(2);
+
+ spin_lock_irqsave(&ioinfo_free_lock, flags);
+
+ /*
+ * Two stages, to avoid using freed pages.
+ *
+ * First free all io_info structs on a page except the first.
+ */
+ list_for_each_entry_safe(this, next, &ioinfo_free, list) {
+ if (((unsigned long) this) & ~PAGE_MASK)
+ list_del(&this->list);
+ }
+
+ /*
+ * Now we have only one reference to each page, and can safely
+ * free pages, knowing we're not going to be trying to access the
+ * same page after freeing it.
+ */
+ list_for_each_entry_safe(this, next, &ioinfo_free, list) {
+ list_del(&this->list);
+ free_page((unsigned long) this);
+ infopages--;
+ suspend_message(SUSPEND_MEMORY, SUSPEND_VERBOSE, 0,
+ "[FreedIOPage %lx]", this);
+ }
+
+ spin_unlock_irqrestore(&ioinfo_free_lock, flags);
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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