linux-kernel - [PATCH v4 1/5] PCI: endpoint: Make struct pci_epf

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Message-Id: <20210713193522.1770306-2-u.kleine-koenig@pengutronix.de>
Date:   Tue, 13 Jul 2021 21:35:18 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     kernel@...gutronix.de, Bjorn Helgaas <bhelgaas@...gle.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH v4 1/5] PCI: endpoint: Make struct pci_epf_driver::remove return void

The driver core ignores the return value of pci_epf_device_remove()
(because there is only little it can do when a device disappears) and
there are no pci_epf_drivers with a remove callback.

So make it impossible for future drivers to return an unused error code
by changing the remove prototype to return void.

The real motivation for this change is the quest to make struct
bus_type::remove return void, too.

Acked-by: Kishon Vijay Abraham I <kishon@...com>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/pci/endpoint/pci-epf-core.c | 5 ++---
 include/linux/pci-epf.h             | 2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
index e9289d10f822..4b9ad96bf1b2 100644
--- a/drivers/pci/endpoint/pci-epf-core.c
+++ b/drivers/pci/endpoint/pci-epf-core.c
@@ -389,15 +389,14 @@ static int pci_epf_device_probe(struct device *dev)
 
 static int pci_epf_device_remove(struct device *dev)
 {
-	int ret = 0;
 	struct pci_epf *epf = to_pci_epf(dev);
 	struct pci_epf_driver *driver = to_pci_epf_driver(dev->driver);
 
 	if (driver->remove)
-		ret = driver->remove(epf);
+		driver->remove(epf);
 	epf->driver = NULL;
 
-	return ret;
+	return 0;
 }
 
 static struct bus_type pci_epf_bus_type = {
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 2debc27ba95e..8292420426f3 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -85,7 +85,7 @@ struct pci_epf_ops {
  */
 struct pci_epf_driver {
 	int	(*probe)(struct pci_epf *epf);
-	int	(*remove)(struct pci_epf *epf);
+	void	(*remove)(struct pci_epf *epf);
 
 	struct device_driver	driver;
 	struct pci_epf_ops	*ops;
-- 
2.30.2