diff options
Diffstat (limited to 'lib/crc-t10dif.c')
| -rw-r--r-- | lib/crc-t10dif.c | 11 |
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) |
