linux-kernel - [PATCH] phy: sun4i-usb: Fix a W=1 compilation failure

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Date:   Sun,  3 Sep 2023 12:11:06 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH] phy: sun4i-usb: Fix a W=1 compilation failure

With gcc 12.3.0, when this file is built, we get errors such as:

drivers/phy/allwinner/phy-sun4i-usb.c: In function ‘sun4i_usb_phy_probe’:
drivers/phy/allwinner/phy-sun4i-usb.c:790:52: error: ‘_vbus’ directive output may be truncated writing 5 bytes into a region of size between 2 and 12 [-Werror=format-truncation=]
  790 |                 snprintf(name, sizeof(name), "usb%d_vbus", i);
      |                                                    ^~~~~
drivers/phy/allwinner/phy-sun4i-usb.c:790:17: note: ‘snprintf’ output between 10 and 20 bytes into a destination of size 16
  790 |                 snprintf(name, sizeof(name), "usb%d_vbus", i);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Because of the possible value of 'i', this can't be an issue in real world
application, but in order to have "make W=1" work correctly, give more
space for 'name'.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/phy/allwinner/phy-sun4i-usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
index ec551464dd4f..e53a9a9317bc 100644
--- a/drivers/phy/allwinner/phy-sun4i-usb.c
+++ b/drivers/phy/allwinner/phy-sun4i-usb.c
@@ -782,7 +782,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 
 	for (i = 0; i < data->cfg->num_phys; i++) {
 		struct sun4i_usb_phy *phy = data->phys + i;
-		char name[16];
+		char name[32];
 
 		if (data->cfg->missing_phys & BIT(i))
 			continue;
-- 
2.34.1