diff options
Diffstat (limited to 'drivers/pci/msi/api.c')
| -rw-r--r-- | drivers/pci/msi/api.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c new file mode 100644 index 000000000000..7485942cbe5d --- /dev/null +++ b/drivers/pci/msi/api.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCI MSI/MSI-X — Exported APIs for device drivers + * + * Copyright (C) 2003-2004 Intel + * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) + * Copyright (C) 2016 Christoph Hellwig. + * Copyright (C) 2022 Linutronix GmbH + */ + +#include <linux/export.h> + +#include "msi.h" + +/** + * pci_disable_msi() - Disable MSI interrupt mode on device + * @dev: the PCI device to operate on + * + * Legacy device driver API to disable MSI interrupt mode on device, + * free earlier allocated interrupt vectors, and restore INTx emulation. + * The PCI device Linux IRQ (@dev->irq) is restored to its default + * pin-assertion IRQ. This is the cleanup pair of pci_enable_msi(). + * + * NOTE: The newer pci_alloc_irq_vectors() / pci_free_irq_vectors() API + * pair should, in general, be used instead. + */ +void pci_disable_msi(struct pci_dev *dev) +{ + if (!pci_msi_enabled() || !dev || !dev->msi_enabled) + return; + + msi_lock_descs(&dev->dev); + pci_msi_shutdown(dev); + pci_free_msi_irqs(dev); + msi_unlock_descs(&dev->dev); +} +EXPORT_SYMBOL(pci_disable_msi); |