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authorThomas Gleixner <tglx@linutronix.de>2021-12-06 23:51:05 +0100
committerThomas Gleixner <tglx@linutronix.de>2021-12-16 22:22:17 +0100
commitb5f687f97d1e112493fe0447a1fb09fbd93c334b (patch)
tree9893ade2ba9d2f36831f8f9b1f58483c6bf2e388 /kernel/irq
parent125282cd4f33ecd53a24ae4807409da0e5e90fd4 (diff)
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.c21
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)