linux-kernel - [PATCH 1/2] i3c: master: Fix confusing cleanup.h syntax

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Message-ID: <20251208020750.4727-3-krzysztof.kozlowski@oss.qualcomm.com>
Date: Mon,  8 Dec 2025 03:07:51 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Frank Li <Frank.Li@....com>, Jorge Marques <jorge.marques@...log.com>,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Subject: [PATCH 1/2] i3c: master: Fix confusing cleanup.h syntax

Initializing automatic __free variables to NULL without need (e.g.
branches with different allocations), followed by actual allocation is
in contrary to explicit coding rules guiding cleanup.h:

"Given that the "__free(...) = NULL" pattern for variables defined at
the top of the function poses this potential interdependency problem the
recommendation is to always define and assign variables in one statement
and not group variable definitions at the top of the function when
__free() is used."

Code does not have a bug, but is less readable and uses discouraged
coding practice, so fix that by moving declaration to the place of
assignment.

Not that other existing usage of __free() in this context is a corret
exception initialized to NULL, because the actual allocation is branched
in if().

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
---
 drivers/i3c/master.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 823661a81f5e..62437a899cdc 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1742,11 +1742,10 @@ EXPORT_SYMBOL_GPL(i3c_master_do_daa);
 struct i3c_dma *i3c_master_dma_map_single(struct device *dev, void *buf,
 	size_t len, bool force_bounce, enum dma_data_direction dir)
 {
-	struct i3c_dma *dma_xfer __free(kfree) = NULL;
 	void *bounce __free(kfree) = NULL;
 	void *dma_buf = buf;
 
-	dma_xfer = kzalloc(sizeof(*dma_xfer), GFP_KERNEL);
+	struct i3c_dma *dma_xfer __free(kfree) = kzalloc(sizeof(*dma_xfer), GFP_KERNEL);
 	if (!dma_xfer)
 		return NULL;
 
-- 
2.51.0