linux-kernel - [PATCH] usb: ohci-omap: avoid unused-variable warning

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Message-Id: <20230118082746.391542-1-arnd@kernel.org>
Date:   Wed, 18 Jan 2023 09:27:34 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kevin Hilman <khilman@...libre.com>,
        Arnd Bergmann <arnd@...db.de>, Tony Lindgren <tony@...mide.com>
Cc:     Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: ohci-omap: avoid unused-variable warning

From: Arnd Bergmann <arnd@...db.de>

The dead code removal has led to 'need_transceiver' not being
used at all when OTG support is disabled:

drivers/usb/host/ohci-omap.c: In function 'ohci_omap_reset':
drivers/usb/host/ohci-omap.c:99:33: error: unused variable 'need_transceiver' [-Werror=unused-variable]
   99 |         int                     need_transceiver = (config->otg != 0);

Change the #ifdef check into an IS_ENABLED() check to make the
code more readable and let the compiler see where it is used.

Fixes: 8825acd7cc8a ("ARM: omap1: remove dead code")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
The patch that caused the issue is in the boardfile-removal branch
of the soc tree. I would just add the patch there.
---
 drivers/usb/host/ohci-omap.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
index 3d57b9454a27..78088cd46908 100644
--- a/drivers/usb/host/ohci-omap.c
+++ b/drivers/usb/host/ohci-omap.c
@@ -67,8 +67,6 @@ static void omap_ohci_clock_power(struct ohci_omap_priv *priv, int on)
 	}
 }
 
-#ifdef	CONFIG_USB_OTG
-
 static void start_hnp(struct ohci_hcd *ohci)
 {
 	struct usb_hcd *hcd = ohci_to_hcd(ohci);
@@ -87,8 +85,6 @@ static void start_hnp(struct ohci_hcd *ohci)
 	local_irq_restore(flags);
 }
 
-#endif
-
 /*-------------------------------------------------------------------------*/
 
 static int ohci_omap_reset(struct usb_hcd *hcd)
@@ -111,8 +107,7 @@ static int ohci_omap_reset(struct usb_hcd *hcd)
 	if (config->ocpi_enable)
 		config->ocpi_enable();
 
-#ifdef	CONFIG_USB_OTG
-	if (need_transceiver) {
+	if (IS_ENABLED(CONFIG_USB_OTG) && need_transceiver) {
 		hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
 		if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
 			int	status = otg_set_host(hcd->usb_phy->otg,
@@ -129,7 +124,6 @@ static int ohci_omap_reset(struct usb_hcd *hcd)
 		hcd->skip_phy_initialization = 1;
 		ohci->start_hnp = start_hnp;
 	}
-#endif
 
 	omap_ohci_clock_power(priv, 1);
 
-- 
2.39.0