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Merge tag 'optee-fix2-for-v5.15' of git://git.linaro.org/people/jens.wiklander/linux-tee into arm/fixes

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Fix missing devices unregister during optee_remove

Unregisters OP-TEE client devices (UUIDs of some known Trusted
Applications) from the TEE bus when the OP-TEE driver is unloaded.

* tag 'optee-fix2-for-v5.15' of git://git.linaro.org/people/jens.wiklander/linux-tee:
  tee: optee: Fix missing devices unregister during optee_remove

Link: https://lore.kernel.org/r/20211013122854.GA1542549@jade
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
2021-10-13 21:17:07 +02:00
parent 0470512952 7f565d0ead
commit 3536ac5d77
3 changed files with 26 additions and 0 deletions
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3
drivers/tee/optee/core.c
View File

@@ -585,6 +585,9 @@ static int optee_remove(struct platform_device *pdev)
{
struct optee *optee = platform_get_drvdata(pdev);
/* Unregister OP-TEE specific client devices on TEE bus */
optee_unregister_devices();
/*
* Ask OP-TEE to free all cached shared memory objects to decrease
* reference counters and also avoid wild pointers in secure world

22
drivers/tee/optee/device.c
View File

@@ -53,6 +53,13 @@ static int get_devices(struct tee_context *ctx, u32 session,
return 0;
}
static void optee_release_device(struct device *dev)
{
struct tee_client_device *optee_device = to_tee_client_device(dev);
kfree(optee_device);
}
static int optee_register_device(const uuid_t *device_uuid)
{
struct tee_client_device *optee_device = NULL;
@@ -63,6 +70,7 @@ static int optee_register_device(const uuid_t *device_uuid)
return -ENOMEM;
optee_device->dev.bus = &tee_bus_type;
optee_device->dev.release = optee_release_device;
if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
kfree(optee_device);
return -ENOMEM;
@@ -154,3 +162,17 @@ int optee_enumerate_devices(u32 func)
{
return __optee_enumerate_devices(func);
}
static int __optee_unregister_device(struct device *dev, void *data)
{
if (!strncmp(dev_name(dev), "optee-ta", strlen("optee-ta")))
device_unregister(dev);
return 0;
}
void optee_unregister_devices(void)
{
bus_for_each_dev(&tee_bus_type, NULL, NULL,
__optee_unregister_device);
}

1
drivers/tee/optee/optee_private.h
View File

@@ -184,6 +184,7 @@ void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
#define PTA_CMD_GET_DEVICES 0x0
#define PTA_CMD_GET_DEVICES_SUPP 0x1
int optee_enumerate_devices(u32 func);
void optee_unregister_devices(void);
/*
* Small helpers