linux-kernel - [PATCH] docs: crypto: async-tx-api: fix broken code example

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Message-Id: <20240523-async-dma-docs-v1-1-b900e0804e11@pengutronix.de>
Date: Thu, 23 May 2024 15:18:29 +0200
From: Ahmad Fatoum <a.fatoum@...gutronix.de>
To: Dan Williams <dan.j.williams@...el.com>, 
 Herbert Xu <herbert@...dor.apana.org.au>, 
 "David S. Miller" <davem@...emloft.net>, Jonathan Corbet <corbet@....net>, 
 Maciej Sosnowski <maciej.sosnowski@...el.com>, 
 Andre Noll <maan@...temlinux.org>
Cc: linux-crypto@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, kernel@...gutronix.de, 
 Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: [PATCH] docs: crypto: async-tx-api: fix broken code example

The code example fails to compile:

  1) ddr_conv is defined twice, once as a VLA, which have been phased out

  2) submit is not a pointer, but is still dereferenced with ->

Fix these issues and while at it, make the functions static as users
are unlikely to export them.

Fixes: 04ce9ab385dc ("async_xor: permit callers to pass in a 'dma/page scribble' region")
Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
---
 Documentation/crypto/async-tx-api.rst | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/Documentation/crypto/async-tx-api.rst b/Documentation/crypto/async-tx-api.rst
index 27c146b54d71..2fa260f2a222 100644
--- a/Documentation/crypto/async-tx-api.rst
+++ b/Documentation/crypto/async-tx-api.rst
@@ -150,38 +150,38 @@ of an operation.
 Perform a xor->copy->xor operation where each operation depends on the
 result from the previous operation::
 
-    void callback(void *param)
+    static void callback(void *param)
     {
 	    struct completion *cmp = param;
 
 	    complete(cmp);
     }
 
-    void run_xor_copy_xor(struct page **xor_srcs,
-			int xor_src_cnt,
-			struct page *xor_dest,
-			size_t xor_len,
-			struct page *copy_src,
-			struct page *copy_dest,
-			size_t copy_len)
+    #define NDISKS  2
+
+    static void run_xor_copy_xor(struct page **xor_srcs,
+				 struct page *xor_dest,
+				 size_t xor_len,
+				 struct page *copy_src,
+				 struct page *copy_dest,
+				 size_t copy_len)
     {
 	    struct dma_async_tx_descriptor *tx;
-	    addr_conv_t addr_conv[xor_src_cnt];
 	    struct async_submit_ctl submit;
 	    addr_conv_t addr_conv[NDISKS];
 	    struct completion cmp;
 
 	    init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL,
 			    addr_conv);
-	    tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, &submit)
+	    tx = async_xor(xor_dest, xor_srcs, 0, NDISKS, xor_len, &submit);
 
-	    submit->depend_tx = tx;
+	    submit.depend_tx = tx;
 	    tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, &submit);
 
 	    init_completion(&cmp);
 	    init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST | ASYNC_TX_ACK, tx,
 			    callback, &cmp, addr_conv);
-	    tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, &submit);
+	    tx = async_xor(xor_dest, xor_srcs, 0, NDISKS, xor_len, &submit);
 
 	    async_tx_issue_pending_all();
 

---
base-commit: a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6
change-id: 20240523-async-dma-docs-00eb18a4e01c

Best regards,
-- 
Ahmad Fatoum <a.fatoum@...gutronix.de>