crypto: tcrypt - Add debug prints

tcrypt is very tight-lipped when it succeeds, but a bit more feedback
would be useful when developing or debugging crypto drivers, especially
since even a successful run ends with the module failing to insert. Add
a couple of debug prints, which can be enabled with dynamic debug:

Before:

 # insmod tcrypt.ko mode=10
 insmod: can't insert 'tcrypt.ko': Resource temporarily unavailable

After:

 # insmod tcrypt.ko mode=10 dyndbg
 tcrypt: testing ecb(aes)
 tcrypt: testing cbc(aes)
 tcrypt: testing lrw(aes)
 tcrypt: testing xts(aes)
 tcrypt: testing ctr(aes)
 tcrypt: testing rfc3686(ctr(aes))
 tcrypt: all tests passed
 insmod: can't insert 'tcrypt.ko': Resource temporarily unavailable

Signed-off-by: Rabin Vincent <rabinv@axis.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 0 deletions

diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index ae22f05d5936..9a11f3c2bf98 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -22,6 +22,8 @@
  *
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <crypto/aead.h>
 #include <crypto/hash.h>
 #include <crypto/skcipher.h>
@@ -1010,6 +1012,8 @@ static inline int tcrypt_test(const char *alg)
 {
         int ret;
 
+        pr_debug("testing %s\n", alg);
+
         ret = alg_test(alg, alg, 0, 0);
         /* non-fips algs return -EINVAL in fips mode */
         if (fips_enabled && ret == -EINVAL)
@@ -2059,6 +2063,8 @@ static int __init tcrypt_mod_init(void)
         if (err) {
                 printk(KERN_ERR "tcrypt: one or more tests failed!\n");
                 goto err_free_tv;
+        } else {
+                pr_debug("all tests passed\n");
         }
 
         /* We intentionaly return -EAGAIN to prevent keeping the module,