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| author | Thomas Gleixner <tglx@linutronix.de> | 2021-12-06 23:51:05 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-12-16 22:22:17 +0100 |
| commit | b5f687f97d1e112493fe0447a1fb09fbd93c334b (patch) | |
| tree | 9893ade2ba9d2f36831f8f9b1f58483c6bf2e388 /kernel/irq | |
| parent | 125282cd4f33ecd53a24ae4807409da0e5e90fd4 (diff) | |
| download | lwn-b5f687f97d1e112493fe0447a1fb09fbd93c334b.tar.gz lwn-b5f687f97d1e112493fe0447a1fb09fbd93c334b.zip | |
genirq/msi: Add mutex for MSI list protection
For upcoming runtime extensions of MSI-X interrupts it's required to
protect the MSI descriptor list. Add a mutex to struct msi_device_data and
provide lock/unlock functions.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210747.708877269@linutronix.de
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/msi.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index c66787daee57..97ec245803f0 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -103,12 +103,33 @@ int msi_setup_device_data(struct device *dev) return -ENOMEM; INIT_LIST_HEAD(&md->list); + mutex_init(&md->mutex); dev->msi.data = md; devres_add(dev, md); return 0; } /** + * msi_lock_descs - Lock the MSI descriptor storage of a device + * @dev: Device to operate on + */ +void msi_lock_descs(struct device *dev) +{ + mutex_lock(&dev->msi.data->mutex); +} +EXPORT_SYMBOL_GPL(msi_lock_descs); + +/** + * msi_unlock_descs - Unlock the MSI descriptor storage of a device + * @dev: Device to operate on + */ +void msi_unlock_descs(struct device *dev) +{ + mutex_unlock(&dev->msi.data->mutex); +} +EXPORT_SYMBOL_GPL(msi_unlock_descs); + +/** * msi_get_virq - Return Linux interrupt number of a MSI interrupt * @dev: Device to operate on * @index: MSI interrupt index to look for (0-based) |