linux-kernel - [PATCH 5.6 031/106] rtw88: avoid unused function warnings

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Message-Id: <20200501131547.705097613@linuxfoundation.org>
Date:   Fri,  1 May 2020 15:23:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 5.6 031/106] rtw88: avoid unused function warnings

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

commit 7dc7c41607d192ff660ba4ea82d517745c1d7523 upstream.

The rtw88 driver defines emtpy functions with multiple indirections
but gets one of these wrong:

drivers/net/wireless/realtek/rtw88/pci.c:1347:12: error: 'rtw_pci_resume' defined but not used [-Werror=unused-function]
 1347 | static int rtw_pci_resume(struct device *dev)
      |            ^~~~~~~~~~~~~~
drivers/net/wireless/realtek/rtw88/pci.c:1342:12: error: 'rtw_pci_suspend' defined but not used [-Werror=unused-function]
 1342 | static int rtw_pci_suspend(struct device *dev)

Better simplify it to rely on the conditional reference in
SIMPLE_DEV_PM_OPS(), and mark the functions as __maybe_unused to avoid
warning about it.

I'm not sure if these are needed at all given that the functions
don't do anything, but they were only recently added.

Fixes: 44bc17f7f5b3 ("rtw88: support wowlan feature for 8822c")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/20200408185413.218643-1-arnd@arndb.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/realtek/rtw88/pci.c |   11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -1287,22 +1287,17 @@ static void rtw_pci_phy_cfg(struct rtw_d
 	rtw_pci_link_cfg(rtwdev);
 }
 
-#ifdef CONFIG_PM
-static int rtw_pci_suspend(struct device *dev)
+static int __maybe_unused rtw_pci_suspend(struct device *dev)
 {
 	return 0;
 }
 
-static int rtw_pci_resume(struct device *dev)
+static int __maybe_unused rtw_pci_resume(struct device *dev)
 {
 	return 0;
 }
 
 static SIMPLE_DEV_PM_OPS(rtw_pm_ops, rtw_pci_suspend, rtw_pci_resume);
-#define RTW_PM_OPS (&rtw_pm_ops)
-#else
-#define RTW_PM_OPS NULL
-#endif
 
 static int rtw_pci_claim(struct rtw_dev *rtwdev, struct pci_dev *pdev)
 {
@@ -1530,7 +1525,7 @@ static struct pci_driver rtw_pci_driver
 	.id_table = rtw_pci_id_table,
 	.probe = rtw_pci_probe,
 	.remove = rtw_pci_remove,
-	.driver.pm = RTW_PM_OPS,
+	.driver.pm = &rtw_pm_ops,
 };
 module_pci_driver(rtw_pci_driver);