[PATCH 5.4 03/58] tee: optee: Fix missing devices unregister during optee_remove

Greg Kroah-Hartman
2021-10-25T19:32:55Z

From: Sumit Garg <sumit.garg@linaro.org>

commit 7f565d0ead264329749c0da488de9c8dfa2f18ce upstream.

When OP-TEE driver is built as a module, OP-TEE client devices
registered on TEE bus during probe should be unregistered during
optee_remove. So implement optee_unregister_devices() accordingly.

Fixes: c3fa24af9244 ("tee: optee: add TEE bus device enumeration support")
Reported-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
[SG: backport to 5.4, dev name s/optee-ta/optee-clnt/]
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tee/optee/core.c | 3 +++
drivers/tee/optee/device.c | 22 ++++++++++++++++++++++
drivers/tee/optee/optee_private.h | 1 +
3 files changed, 26 insertions(+)

--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -582,6 +582,9 @@ static struct optee *optee_probe(struct
if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
pool = optee_config_dyn_shm();

+ /* Unregister OP-TEE specific client devices on TEE bus */
+ optee_unregister_devices();
+
/*
* If dynamic shared memory is not available or failed - try static one
*/
--- a/drivers/tee/optee/device.c
+++ b/drivers/tee/optee/device.c
@@ -65,6 +65,13 @@ static int get_devices(struct tee_contex
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, u32 device_id)
{
struct tee_client_device *optee_device = NULL;
@@ -75,6 +82,7 @@ static int optee_register_device(const u
return -ENOMEM;

optee_device->dev.bus = &tee_bus_type;
+ optee_device->dev.release = optee_release_device;
dev_set_name(&optee_device->dev, "optee-clnt%u", device_id);
uuid_copy(&optee_device->id.uuid, device_uuid);

@@ -158,3 +166,17 @@ out_ctx:

return rc;
}
+
+static int __optee_unregister_device(struct device *dev, void *data)
+{
+ if (!strncmp(dev_name(dev), "optee-clnt", strlen("optee-clnt")))
+ device_unregister(dev);
+
+ return 0;
+}
+
+void optee_unregister_devices(void)
+{
+ bus_for_each_dev(&tee_bus_type, NULL, NULL,
+ __optee_unregister_device);
+}
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -175,6 +175,7 @@ void optee_fill_pages_list(u64 *dst, str
size_t page_offset);

int optee_enumerate_devices(void);
+void optee_unregister_devices(void);

/*
* Small helpers