omap-aes: IV not updated after encrypt/decrypt operation

[Francis Le Bourse]

Hi,

AES_REG_IV() registers should be read back at the end of encryption or 
decryption operations and the values returned to the caller.

Add the code and helper to do just that.

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index 49bd56f..744885b 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -97,6 +97,13 @@ static void omap_aes_write_n(struct omap_aes_dev *dd, 
u32 offset,
                 omap_aes_write(dd, offset, *value);
  }

+static void omap_aes_read_n(struct omap_aes_dev *dd, u32 offset,
+                                       u32 *value, int count)
+{
+       for (; count--; value++, offset += 4)
+               *value = omap_aes_read(dd, offset);
+}
+
  static int omap_aes_hw_init(struct omap_aes_dev *dd)
  {
         int err;
@@ -389,6 +396,9 @@ static void omap_aes_finish_req(struct omap_aes_dev 
*dd, int err)

         pr_debug("err: %d\n", err);

+       if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
+               omap_aes_read_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
+
         crypto_finalize_cipher_request(dd->engine, req, err);




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