device: Add device:: Msi_data pointer and struct msi_device_data

Create struct msi_device_data and add a pointer of that type to struct dev_msi_info, which is part of struct device. Provide an allocator function which can be invoked from the MSI interrupt allocation code pathes. Add a properties field to the data structure as a first member so the allocation size is not zero bytes. The field will be uses later on.

Thomas Gleixner committed 4 years ago

Commit 013bd8e1 parent 34fff623 files · +55 −0Browse files

Showing the changes to kernel (1 of 3 files). Show all

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kernel/irq/msi.c+32−0

@@ -73,6 +73,38 @@ void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg) · 72 unmodified lines
73	73	}
74	74	EXPORT_SYMBOL_GPL(get_cached_msi_msg);
75	75
	76	+static void msi_device_data_release(struct device dev, void res)
	77	+{
	78	+ WARN_ON_ONCE(!list_empty(&dev->msi_list));
	79	+ dev->msi.data = NULL;
	80	+}
	81	+
	82	+/**
	83	+ * msi_setup_device_data - Setup MSI device data
	84	+ * @dev: Device for which MSI device data should be set up
	85	+ *
	86	+ * Return: 0 on success, appropriate error code otherwise
	87	+ *
	88	+ * This can be called more than once for @dev. If the MSI device data is
	89	+ * already allocated the call succeeds. The allocated memory is
	90	+ * automatically released when the device is destroyed.
	91	+ */
	92	+int msi_setup_device_data(struct device *dev)
	93	+{
	94	+ struct msi_device_data *md;
	95	+
	96	+ if (dev->msi.data)
	97	+ return 0;
	98	+
	99	+ md = devres_alloc(msi_device_data_release, sizeof(*md), GFP_KERNEL);
	100	+ if (!md)
	101	+ return -ENOMEM;
	102	+
	103	+ dev->msi.data = md;
	104	+ devres_add(dev, md);
	105	+ return 0;
	106	+}
	107	+
76	108	#ifdef CONFIG_SYSFS
77	109	static ssize_t msi_mode_show(struct device dev, struct device_attribute attr,
78	110	char *buf)