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	EXPORT_SYMBOL_GPL(get_cached_msi_msg);	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	#ifdef CONFIG_SYSFS	108	#ifdef CONFIG_SYSFS
77	static ssize_t msi_mode_show(struct device dev, struct device_attribute attr,	109	static ssize_t msi_mode_show(struct device dev, struct device_attribute attr,
78	char *buf)	110	char *buf)