tee: optee: Fix missing devices unregister during optee_remove

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>

diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 5ce13b0..5363ebe 100644 (file)
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -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

diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
index ec1d246..128a2d2 100644 (file)
--- a/drivers/tee/optee/device.c
+++ b/drivers/tee/optee/device.c
@@ -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);
+}

diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index dbdd367..f6bb4a7 100644 (file)
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -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