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-rw-r--r--lib/crc-t10dif.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/lib/crc-t10dif.c b/lib/crc-t10dif.c
index 43bc5b0..dfe6ec1 100644
--- a/lib/crc-t10dif.c
+++ b/lib/crc-t10dif.c
@@ -14,8 +14,10 @@
#include <linux/err.h>
#include <linux/init.h>
#include <crypto/hash.h>
+#include <linux/static_key.h>
static struct crypto_shash *crct10dif_tfm;
+static struct static_key crct10dif_fallback __read_mostly;
__u16 crc_t10dif(const unsigned char *buffer, size_t len)
{
@@ -25,6 +27,9 @@ __u16 crc_t10dif(const unsigned char *buffer, size_t len)
} desc;
int err;
+ if (static_key_false(&crct10dif_fallback))
+ return crc_t10dif_generic(0, buffer, len);
+
desc.shash.tfm = crct10dif_tfm;
desc.shash.flags = 0;
*(__u16 *)desc.ctx = 0;
@@ -39,7 +44,11 @@ EXPORT_SYMBOL(crc_t10dif);
static int __init crc_t10dif_mod_init(void)
{
crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
- return PTR_RET(crct10dif_tfm);
+ if (IS_ERR(crct10dif_tfm)) {
+ static_key_slow_inc(&crct10dif_fallback);
+ crct10dif_tfm = NULL;
+ }
+ return 0;
}
static void __exit crc_t10dif_mod_fini(void)
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