linux-kernel - [PATCH v2] PCI: Add dummy implement for pci_clear

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Message-Id: <20230531102744.2354313-1-suijingfeng@loongson.cn>
Date:   Wed, 31 May 2023 18:27:44 +0800
From:   Sui Jingfeng <suijingfeng@...ngson.cn>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Ben Hutchings <bhutchings@...arflare.com>,
        Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:     Li Yi <liyi@...ngson.cn>, linux-pci@...r.kernel.org,
        loongson-kernel@...ts.loongnix.cn, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, kernel test robot <lkp@...el.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH v2] PCI: Add dummy implement for pci_clear_master() function

As some arch(m68k for example) doesn't have config_pci enabled, drivers[1]
call pci_clear_master() without config_pci guard can not pass compile test.

   drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c:
   In function 'etnaviv_gpu_pci_fini':
>> drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c:32:9:
   error: implicit declaration of function 'pci_clear_master';
   did you mean 'pci_set_master'? [-Werror=implicit-function-declaration]
      32 |         pci_clear_master(pdev);
         |         ^~~~~~~~~~~~~~~~
         |         pci_set_master
   cc1: some warnings being treated as errors

[1] https://patchwork.freedesktop.org/patch/539977/?series=118522&rev=1

V2:
	* Adjust commit log style to meet the convention and add Fixes tag

Fixes: 6a479079c072 ("PCI: Add pci_clear_master() as opposite of pci_set_master()")
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202305301659.4guSLavL-lkp@intel.com/
Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
---
 include/linux/pci.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index d0c19ff0c958..71c85380676c 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1904,6 +1904,7 @@ static inline int pci_dev_present(const struct pci_device_id *ids)
 #define pci_dev_put(dev)	do { } while (0)
 
 static inline void pci_set_master(struct pci_dev *dev) { }
+static inline void pci_clear_master(struct pci_dev *dev) { }
 static inline int pci_enable_device(struct pci_dev *dev) { return -EIO; }
 static inline void pci_disable_device(struct pci_dev *dev) { }
 static inline int pcim_enable_device(struct pci_dev *pdev) { return -EIO; }
-- 
2.25.1