[CRYPTO] geode: relax in busy loop and care about return value

The code waits in a busy loop until the hardware finishes the encryption
or decryption process. This wants a cpu_relax() :)
The busy loop finishes either if the encryption is done or if the counter
is zero. If the latter is true than the hardware failed. Since this
should not happen, leave sith a BUG().

Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/crypto/geode-aes.c b/drivers/crypto/geode-aes.c
index 6c04f1363e6d..6c6a31b979be 100644
--- a/drivers/crypto/geode-aes.c
+++ b/drivers/crypto/geode-aes.c
@@ -88,9 +88,10 @@ do_crypt(void *src, void *dst, int len, u32 flags)
         /* Start the operation */
         iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
 
-        do
+        do {
                 status = ioread32(_iobase + AES_INTR_REG);
-        while(!(status & AES_INTRA_PENDING) && --counter);
+                cpu_relax();
+        } while(!(status & AES_INTRA_PENDING) && --counter);
 
         /* Clear the event */
         iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
@@ -102,6 +103,7 @@ geode_aes_crypt(struct geode_aes_op *op)
 {
         u32 flags = 0;
         unsigned long iflags;
+        int ret;
 
         if (op->len == 0)
                 return 0;
@@ -130,7 +132,8 @@ geode_aes_crypt(struct geode_aes_op *op)
                 _writefield(AES_WRITEKEY0_REG, op->key);
         }
 
-        do_crypt(op->src, op->dst, op->len, flags);
+        ret = do_crypt(op->src, op->dst, op->len, flags);
+        BUG_ON(ret);
 
         if (op->mode == AES_MODE_CBC)
                 _readfield(AES_WRITEIV0_REG, op->iv);