[tip: irq/msi] PCI/MSI: Set pci_dev:: Msi_enabled late

tip-bot2 for Thomas Gleixner
2025-04-09T18:54:34Z

The following commit has been merged into the irq/msi branch of tip:

Commit-ID: b0c44a5ec3552f89c47dac9903d99c22d796d87f
Gitweb: https://git.kernel.org/tip/b0c44a5ec3552f89c47dac9903d99c22d796d87f
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 19 Mar 2025 11:56:49 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 09 Apr 2025 20:47:29 +02:00

PCI/MSI: Set pci_dev:: Msi_enabled late

The comment claiming that pci_dev::msi_enabled has to be set across setup
is a leftover from ancient code versions. Nothing in the setup code
requires the flag to be set anymore.

Set it in the success path and remove the extra goto label.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/all/20250319105506.383222333@linutronix.de

---
drivers/pci/msi/msi.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 3283baa..c26e516 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -358,12 +358,8 @@ static int msi_capability_init(struct pci_dev *dev, int nvec,
if (nvec > 1 && !pci_msi_domain_supports(dev, MSI_FLAG_MULTI_PCI_MSI, ALLOW_LEGACY))
return 1;

- /*
- * Disable MSI during setup in the hardware, but mark it enabled
- * so that setup code can evaluate it.
- */
+ /* Disable MSI during setup in the hardware to erase stale state */
pci_msi_set_enable(dev, 0);
- dev->msi_enabled = 1;

if (affd)
masks = irq_create_affinity_masks(nvec, affd);
@@ -371,7 +367,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec,
msi_lock_descs(&dev->dev);
ret = msi_setup_msi_desc(dev, nvec, masks);
if (ret)
- goto fail;
+ goto unlock;

/* All MSIs are unmasked by default; mask them all */
entry = msi_first_desc(&dev->dev, MSI_DESC_ALL);
@@ -393,6 +389,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec,
goto err;

/* Set MSI enabled bits */
+ dev->msi_enabled = 1;
pci_intx_for_msi(dev, 0);
pci_msi_set_enable(dev, 1);

@@ -403,8 +400,6 @@ static int msi_capability_init(struct pci_dev *dev, int nvec,
err:
pci_msi_unmask(&desc, msi_multi_mask(&desc));
pci_free_msi_irqs(dev);
-fail:
- dev->msi_enabled = 0;
unlock:
msi_unlock_descs(&dev->dev);
kfree(masks);