[PATCH v6 07/10] PCI: Give pcim_set_mwi() its own devres callback

Philipp Stanner
2024-04-08T08:44:46Z

Managing pci_set_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 struct pci_devres.
Give pcim_set_mwi() a separate devres-callback.

Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
drivers/pci/devres.c | 29 ++++++++++++++++++-----------
drivers/pci/pci.h | 1 -
2 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index fb9e4ab6bcfe..e257c212cd9c 100644
--- a/drivers/pci/devres.c
+++ b/drivers/pci/devres.c
@@ -370,24 +370,34 @@ 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;
+ int ret;

- dr = find_pci_dr(dev);
- if (!dr)
- return -ENOMEM;
+ ret = devm_add_action(&pdev->dev, __pcim_clear_mwi, pdev);
+ if (ret != 0)
+ return ret;
+
+ ret = pci_set_mwi(pdev);
+ if (ret != 0)
+ devm_remove_action(&pdev->dev, __pcim_clear_mwi, pdev);

- dr->mwi = 1;
- return pci_set_mwi(dev);
+ return ret;
}
EXPORT_SYMBOL(pcim_set_mwi);

@@ -397,9 +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 a080efd69e85..c98de280b16e 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -825,7 +825,6 @@ 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);
--
2.44.0