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From: Philipp Stanner <pstanner@redhat.com>
To: Jonathan Corbet <corbet@lwn.net>,
	Hans de Goede <hdegoede@redhat.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Philipp Stanner <pstanner@redhat.com>,
	Sam Ravnborg <sam@ravnborg.org>,
	dakr@redhat.com
Cc: linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org,
	linux-pci@vger.kernel.org
Subject: [PATCH 07/10] pci: devres: give mwi its own callback
Date: Mon, 15 Jan 2024 15:46:18 +0100
Message-ID: <20240115144655.32046-9-pstanner@redhat.com>
In-Reply-To: <20240115144655.32046-2-pstanner@redhat.com>
References: <20240115144655.32046-2-pstanner@redhat.com>
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managing mwi with devres can easily be done with its own callback,
without the necessity to store any state about it in a device-related
struct.

Remove the mwi state from the devres-struct.
Make the devres-mwi functions set a separate devres-callback.

Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
 drivers/pci/devres.c | 23 +++++++++++------------
 drivers/pci/pci.h    |  1 -
 2 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index de8cf6f87dd7..911c2037d9fd 100644
--- a/drivers/pci/devres.c
+++ b/drivers/pci/devres.c
@@ -378,24 +378,26 @@ void __iomem *devm_pci_remap_cfg_resource(struct device *dev,
 }
 EXPORT_SYMBOL(devm_pci_remap_cfg_resource);
 
+static void __pcim_clear_mwi(void *pdev_raw)
+{
+	struct pci_dev *pdev = pdev_raw;
+
+	pci_clear_mwi(pdev);
+}
+
 /**
  * pcim_set_mwi - a device-managed pci_set_mwi()
- * @dev: the PCI device for which MWI is enabled
+ * @pdev: the PCI device for which MWI is enabled
  *
  * Managed pci_set_mwi().
  *
  * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
  */
-int pcim_set_mwi(struct pci_dev *dev)
+int pcim_set_mwi(struct pci_dev *pdev)
 {
-	struct pci_devres *dr;
-
-	dr = find_pci_dr(dev);
-	if (!dr)
-		return -ENOMEM;
+	devm_add_action(&pdev->dev, __pcim_clear_mwi, pdev);
 
-	dr->mwi = 1;
-	return pci_set_mwi(dev);
+	return pci_set_mwi(pdev);
 }
 EXPORT_SYMBOL(pcim_set_mwi);
 
@@ -405,9 +407,6 @@ static void pcim_release(struct device *gendev, void *res)
 	struct pci_dev *dev = to_pci_dev(gendev);
 	struct pci_devres *this = res;
 
-	if (this->mwi)
-		pci_clear_mwi(dev);
-
 	if (this->restore_intx)
 		pci_intx(dev, this->orig_intx);
 
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 3d9908a69ebf..667bfdd61d5e 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -811,7 +811,6 @@ static inline pci_power_t mid_pci_get_power_state(struct pci_dev *pdev)
 struct pci_devres {
 	unsigned int orig_intx:1;
 	unsigned int restore_intx:1;
-	unsigned int mwi:1;
 };
 
 struct pci_devres *find_pci_dr(struct pci_dev *pdev);
-- 
2.43.0