crypto: caam - use devres to de-initialize the RNG

Use devres to de-initialize the RNG and drop explicit de-initialization
code in caam_remove().
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Horia Geantă <horia.geanta@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Iuliana Prodan <iuliana.prodan@nxp.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/ctrl.c

@@ -175,6 +175,73 @@ static inline int run_descriptor_deco0(struct device *ctrldev, u32 *desc,
 	return 0;
 }
 
+/*
+ * deinstantiate_rng - builds and executes a descriptor on DECO0,
+ *		       which deinitializes the RNG block.
+ * @ctrldev - pointer to device
+ * @state_handle_mask - bitmask containing the instantiation status
+ *			for the RNG4 state handles which exist in
+ *			the RNG4 block: 1 if it's been instantiated
+ *
+ * Return: - 0 if no error occurred
+ *	   - -ENOMEM if there isn't enough memory to allocate the descriptor
+ *	   - -ENODEV if DECO0 couldn't be acquired
+ *	   - -EAGAIN if an error occurred when executing the descriptor
+ */
+static int deinstantiate_rng(struct device *ctrldev, int state_handle_mask)
+{
+	u32 *desc, status;
+	int sh_idx, ret = 0;
+
+	desc = kmalloc(CAAM_CMD_SZ * 3, GFP_KERNEL);
+	if (!desc)
+		return -ENOMEM;
+
+	for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) {
+		/*
+		 * If the corresponding bit is set, then it means the state
+		 * handle was initialized by us, and thus it needs to be
+		 * deinitialized as well
+		 */
+		if ((1 << sh_idx) & state_handle_mask) {
+			/*
+			 * Create the descriptor for deinstantating this state
+			 * handle
+			 */
+			build_deinstantiation_desc(desc, sh_idx);
+
+			/* Try to run it through DECO0 */
+			ret = run_descriptor_deco0(ctrldev, desc, &status);
+
+			if (ret ||
+			    (status && status != JRSTA_SSRC_JUMP_HALT_CC)) {
+				dev_err(ctrldev,
+					"Failed to deinstantiate RNG4 SH%d\n",
+					sh_idx);
+				break;
+			}
+			dev_info(ctrldev, "Deinstantiated RNG4 SH%d\n", sh_idx);
+		}
+	}
+
+	kfree(desc);
+
+	return ret;
+}
+
+static void devm_deinstantiate_rng(void *data)
+{
+	struct device *ctrldev = data;
+	struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
+
+	/*
+	 * De-initialize RNG state handles initialized by this driver.
+	 * In case of SoCs with Management Complex, RNG is managed by MC f/w.
+	 */
+	if (ctrlpriv->rng4_sh_init)
+		deinstantiate_rng(ctrldev, ctrlpriv->rng4_sh_init);
+}
+
 /*
  * instantiate_rng - builds and executes a descriptor on DECO0,
  *		     which initializes the RNG block.
@@ -247,59 +314,9 @@ static int instantiate_rng(struct device *ctrldev, int state_handle_mask,
 
 	kfree(desc);
 
-	return ret;
-}
-
-/*
- * deinstantiate_rng - builds and executes a descriptor on DECO0,
- *		       which deinitializes the RNG block.
- * @ctrldev - pointer to device
- * @state_handle_mask - bitmask containing the instantiation status
- *			for the RNG4 state handles which exist in
- *			the RNG4 block: 1 if it's been instantiated
- *
- * Return: - 0 if no error occurred
- *	   - -ENOMEM if there isn't enough memory to allocate the descriptor
- *	   - -ENODEV if DECO0 couldn't be acquired
- *	   - -EAGAIN if an error occurred when executing the descriptor
- */
-static int deinstantiate_rng(struct device *ctrldev, int state_handle_mask)
-{
-	u32 *desc, status;
-	int sh_idx, ret = 0;
-
-	desc = kmalloc(CAAM_CMD_SZ * 3, GFP_KERNEL);
-	if (!desc)
-		return -ENOMEM;
-
-	for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) {
-		/*
-		 * If the corresponding bit is set, then it means the state
-		 * handle was initialized by us, and thus it needs to be
-		 * deinitialized as well
-		 */
-		if ((1 << sh_idx) & state_handle_mask) {
-			/*
-			 * Create the descriptor for deinstantating this state
-			 * handle
-			 */
-			build_deinstantiation_desc(desc, sh_idx);
-
-			/* Try to run it through DECO0 */
-			ret = run_descriptor_deco0(ctrldev, desc, &status);
-
-			if (ret ||
-			    (status && status != JRSTA_SSRC_JUMP_HALT_CC)) {
-				dev_err(ctrldev,
-					"Failed to deinstantiate RNG4 SH%d\n",
-					sh_idx);
-				break;
-			}
-			dev_info(ctrldev, "Deinstantiated RNG4 SH%d\n", sh_idx);
-		}
-	}
-
-	kfree(desc);
+	if (!ret)
+		ret = devm_add_action_or_reset(ctrldev, devm_deinstantiate_rng,
+					       ctrldev);
 
 	return ret;
 }
@@ -320,13 +337,6 @@ static int caam_remove(struct platform_device *pdev)
 		caam_qi_shutdown(ctrldev);
 #endif
 
-	/*
-	 * De-initialize RNG state handles initialized by this driver.
-	 * In case of SoCs with Management Complex, RNG is managed by MC f/w.
-	 */
-	if (!ctrlpriv->mc_en && ctrlpriv->rng4_sh_init)
-		deinstantiate_rng(ctrldev, ctrlpriv->rng4_sh_init);
-
 	return 0;
 }