linux-kernel - [PATCH 2/3] PCI: introduce can

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Date: Fri, 2 Feb 2024 17:25:55 -0500
From: Hamza Mahfooz <hamza.mahfooz@....com>
To: <linux-kernel@...r.kernel.org>
CC: Hamza Mahfooz <hamza.mahfooz@....com>, <stable@...r.kernel.org>, "Greg
 Kroah-Hartman" <gregkh@...uxfoundation.org>, "Rafael J. Wysocki"
	<rafael@...nel.org>, Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>, "Pan, Xinhui"
	<Xinhui.Pan@....com>, David Airlie <airlied@...il.com>, Daniel Vetter
	<daniel@...ll.ch>, Bjorn Helgaas <bhelgaas@...gle.com>, Mario Limonciello
	<mario.limonciello@....com>, Lijo Lazar <lijo.lazar@....com>, "Srinivasan
 Shanmugam" <srinivasan.shanmugam@....com>, Le Ma <le.ma@....com>,
	André Almeida <andrealmeid@...lia.com>, James Zhu
	<James.Zhu@....com>, Aurabindo Pillai <aurabindo.pillai@....com>, "Jason
 Gunthorpe" <jgg@...pe.ca>, Wei Liu <wei.liu@...nel.org>, Robin Murphy
	<robin.murphy@....com>, <amd-gfx@...ts.freedesktop.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-pci@...r.kernel.org>
Subject: [PATCH 2/3] PCI: introduce can_remove()

Wire up the can_remove() callback, such that pci drivers can implement
their own version of it.

Cc: stable@...r.kernel.org
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>
---
 drivers/pci/pci-driver.c | 12 ++++++++++++
 include/linux/pci.h      |  5 +++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 51ec9e7e784f..8aae484c5494 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -466,6 +466,17 @@ static int pci_device_probe(struct device *dev)
 	return error;
 }
 
+static bool pci_device_can_remove(struct device *dev)
+{
+	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct pci_driver *drv = pci_dev->driver;
+
+	if (drv->can_remove)
+		return drv->can_remove(pci_dev);
+
+	return true;
+}
+
 static void pci_device_remove(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
@@ -1680,6 +1691,7 @@ struct bus_type pci_bus_type = {
 	.match		= pci_bus_match,
 	.uevent		= pci_uevent,
 	.probe		= pci_device_probe,
+	.can_remove	= pci_device_can_remove,
 	.remove		= pci_device_remove,
 	.shutdown	= pci_device_shutdown,
 	.dev_groups	= pci_dev_groups,
diff --git a/include/linux/pci.h b/include/linux/pci.h
index add9368e6314..95276f44b23b 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -902,6 +902,10 @@ struct module;
  *		(negative number) otherwise.
  *		The probe function always gets called from process
  *		context, so it can sleep.
+ * @can_remove:	The can_remove() function gets called during driver
+ *		deregistration to determine if remove() can be called.
+ *		The probe function always gets called from process
+ *		context, so it can sleep.
  * @remove:	The remove() function gets called whenever a device
  *		being handled by this driver is removed (either during
  *		deregistration of the driver or when it's manually
@@ -943,6 +947,7 @@ struct pci_driver {
 	const char		*name;
 	const struct pci_device_id *id_table;	/* Must be non-NULL for probe to be called */
 	int  (*probe)(struct pci_dev *dev, const struct pci_device_id *id);	/* New device inserted */
+	bool (*can_remove)(struct pci_dev *dev);
 	void (*remove)(struct pci_dev *dev);	/* Device removed (NULL if not a hot-plug capable driver) */
 	int  (*suspend)(struct pci_dev *dev, pm_message_t state);	/* Device suspended */
 	int  (*resume)(struct pci_dev *dev);	/* Device woken up */
-- 
2.43.0