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Subject[Suspend2][ 03/13] [Suspend2] Compression cryptoapi initialisation and cleanup.
Date
Add the routines for preparing cryptoapi for suspend2 use and cleaning it
up.

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

kernel/power/compression.c | 37 +++++++++++++++++++++++++++++++++++++
1 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/kernel/power/compression.c b/kernel/power/compression.c
index 3d222b3..470644f 100644
--- a/kernel/power/compression.c
+++ b/kernel/power/compression.c
@@ -92,3 +92,40 @@ static inline void suspend_compress_free
page_buffer = NULL;
}

+/*
+ * suspend_compress_cleanup
+ *
+ * Frees memory allocated for our labours.
+ */
+static void suspend_compress_cleanup(void)
+{
+ if (suspend_compressor_transform) {
+ crypto_free_tfm(suspend_compressor_transform);
+ suspend_compressor_transform = NULL;
+ }
+}
+
+/*
+ * suspend_crypto_prepare
+ *
+ * Prepare to do some work by allocating buffers and transforms.
+ * Returns: Int: Zero. Even if we can't set up compression, we still
+ * seek to suspend.
+ */
+static int suspend_compress_crypto_prepare(void)
+{
+ if (!*suspend_compressor_name) {
+ printk("Suspend2: Compression enabled but no compressor name set.\n");
+ suspend_compression_ops.disabled = 1;
+ return 0;
+ }
+
+ if (!(suspend_compressor_transform = crypto_alloc_tfm(suspend_compressor_name, 0))) {
+ printk("Suspend2: Failed to initialise the %s compression transform.\n",
+ suspend_compressor_name);
+ return 1;
+ }
+
+ return 0;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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