linux-kernel - [PATCH] clk: microchip: mpfs-ccc: Use devm_kasprintf() for allocating formatted strings

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Message-Id: <f904fd28b2087d1463ea65f059924e3b1acc193c.1672764239.git.geert+renesas@glider.be>
Date:   Tue,  3 Jan 2023 17:45:30 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Conor Dooley <conor.dooley@...rochip.com>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] clk: microchip: mpfs-ccc: Use devm_kasprintf() for allocating formatted strings

In various places, string buffers of a fixed size are allocated, and
filled using snprintf() with the same fixed size, which is error-prone.

Replace this by calling devm_kasprintf() instead, which always uses the
appropriate size.

While at it, remove an unneeded intermediate variable, which allows us
to drop a cast as a bonus.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 drivers/clk/microchip/clk-mpfs-ccc.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/microchip/clk-mpfs-ccc.c b/drivers/clk/microchip/clk-mpfs-ccc.c
index 32aae880a14f3b1c..0ddc73e07be42973 100644
--- a/drivers/clk/microchip/clk-mpfs-ccc.c
+++ b/drivers/clk/microchip/clk-mpfs-ccc.c
@@ -164,12 +164,11 @@ static int mpfs_ccc_register_outputs(struct device *dev, struct mpfs_ccc_out_hw_
 
 	for (unsigned int i = 0; i < num_clks; i++) {
 		struct mpfs_ccc_out_hw_clock *out_hw = &out_hws[i];
-		char *name = devm_kzalloc(dev, 23, GFP_KERNEL);
+		char *name = devm_kasprintf(dev, GFP_KERNEL, "%s_out%u", parent->name, i);
 
 		if (!name)
 			return -ENOMEM;
 
-		snprintf(name, 23, "%s_out%u", parent->name, i);
 		out_hw->divider.hw.init = CLK_HW_INIT_HW(name, &parent->hw, &clk_divider_ops, 0);
 		out_hw->divider.reg = data->pll_base[i / MPFS_CCC_OUTPUTS_PER_PLL] +
 			out_hw->reg_offset;
@@ -201,14 +200,13 @@ static int mpfs_ccc_register_plls(struct device *dev, struct mpfs_ccc_pll_hw_clo
 
 	for (unsigned int i = 0; i < num_clks; i++) {
 		struct mpfs_ccc_pll_hw_clock *pll_hw = &pll_hws[i];
-		char *name = devm_kzalloc(dev, 18, GFP_KERNEL);
 
-		if (!name)
+		pll_hw->name = devm_kasprintf(dev, GFP_KERNEL, "ccc%s_pll%u",
+					      strchrnul(dev->of_node->full_name, '@'), i);
+		if (!pll_hw->name)
 			return -ENOMEM;
 
 		pll_hw->base = data->pll_base[i];
-		snprintf(name, 18, "ccc%s_pll%u", strchrnul(dev->of_node->full_name, '@'), i);
-		pll_hw->name = (const char *)name;
 		pll_hw->hw.init = CLK_HW_INIT_PARENTS_DATA_FIXED_SIZE(pll_hw->name,
 								      pll_hw->parents,
 								      &mpfs_ccc_pll_ops, 0);
-- 
2.25.1