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MFD: mcp-core: sanitize host creation/removal 

host_unregister() gives us no chance between removing the device
and the mcp data structure being freed to access the data inbetween,
which drivers may need to do if they need to iounmap() pointers in
their private data structures.

Therefore, re-jig the interfaces, which are now, on creation:

	mcp = mcp_host_alloc()
	if (mcp) {
		ret = mcp_host_add(mcp, data);

		if (!ret)
			mcp_host_free(mcp);
	}

and on removal:

	mcp_host_del(mcp);
	... access mcp ...
	mcp_host_free(mcp);

The free does the final put_device() on the struct device as one would
expect.

Acked-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-01-20 22:51:07 +00:00
parent 0af5e4c36e
commit 30816ac049
3 changed files with 20 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/mfd/mcp-core.c
View File

@ -208,6 +208,7 @@ struct mcp *mcp_host_alloc(struct device *parent, size_t size)
mcp = kzalloc(sizeof(struct mcp) + size, GFP_KERNEL);
if (mcp) {
spin_lock_init(&mcp->lock);
device_initialize(&mcp->attached_device);
mcp->attached_device.parent = parent;
mcp->attached_device.bus = &mcp_bus_type;
mcp->attached_device.dma_mask = parent->dma_mask;
@ -217,18 +218,24 @@ struct mcp *mcp_host_alloc(struct device *parent, size_t size)
}
EXPORT_SYMBOL(mcp_host_alloc);
int mcp_host_register(struct mcp *mcp)
int mcp_host_add(struct mcp *mcp)
{
dev_set_name(&mcp->attached_device, "mcp0");
return device_register(&mcp->attached_device);
return device_add(&mcp->attached_device);
}
EXPORT_SYMBOL(mcp_host_register);
EXPORT_SYMBOL(mcp_host_add);
void mcp_host_unregister(struct mcp *mcp)
void mcp_host_del(struct mcp *mcp)
{
device_unregister(&mcp->attached_device);
device_del(&mcp->attached_device);
}
EXPORT_SYMBOL(mcp_host_unregister);
EXPORT_SYMBOL(mcp_host_del);
void mcp_host_free(struct mcp *mcp)
{
put_device(&mcp->attached_device);
}
EXPORT_SYMBOL(mcp_host_free);
int mcp_driver_register(struct mcp_driver *mcpdrv)
{

6
drivers/mfd/mcp-sa11x0.c
View File

@ -195,10 +195,11 @@ static int mcp_sa11x0_probe(struct platform_device *pdev)
mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
mcp->sclk_rate;
ret = mcp_host_register(mcp);
ret = mcp_host_add(mcp);
if (ret == 0)
goto out;
mcp_host_free(mcp);
release:
release_mem_region(0x80060000, 0x60);
platform_set_drvdata(pdev, NULL);
@ -212,7 +213,8 @@ static int mcp_sa11x0_remove(struct platform_device *dev)
struct mcp *mcp = platform_get_drvdata(dev);
platform_set_drvdata(dev, NULL);
mcp_host_unregister(mcp);
mcp_host_del(mcp);
mcp_host_free(mcp);
release_mem_region(0x80060000, 0x60);
return 0;

5
include/linux/mfd/mcp.h
View File

@ -47,8 +47,9 @@ void mcp_disable(struct mcp *);
#define mcp_get_sclk_rate(mcp) ((mcp)->sclk_rate)
struct mcp *mcp_host_alloc(struct device *, size_t);
int mcp_host_register(struct mcp *);
void mcp_host_unregister(struct mcp *);
int mcp_host_add(struct mcp *);
void mcp_host_del(struct mcp *);
void mcp_host_free(struct mcp *);
struct mcp_driver {
struct device_driver drv;