drivers/s390/net/smsgiucv_app.c

Source file repositories/reference/linux-study-clean/drivers/s390/net/smsgiucv_app.c

File Facts

System
Linux kernel
Corpus path
drivers/s390/net/smsgiucv_app.c
Extension
.c
Size
5250 bytes
Lines
210
Domain
Driver Families
Bucket
drivers/s390
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct device_driver *smsgiucv_drv;
	int rc;

	if (!machine_is_vm())
		return -ENODEV;

	smsgiucv_drv = driver_find(SMSGIUCV_DRV_NAME, &iucv_bus);
	if (!smsgiucv_drv)
		return -ENODEV;

	smsg_app_dev = iucv_alloc_device(NULL, smsgiucv_drv, NULL, "smsgiucv_app");
	if (!smsg_app_dev)
		return -ENOMEM;

	rc = device_register(smsg_app_dev);
	if (rc) {
		put_device(smsg_app_dev);
		goto fail;
	}

	/* convert sender to uppercase characters */
	if (sender) {
		int len = strlen(sender);
		while (len--)
			sender[len] = toupper(sender[len]);
	}

	/* register with the smsgiucv device driver */
	rc = smsg_register_callback(SMSG_PREFIX, smsg_app_callback);
	if (rc) {
		device_unregister(smsg_app_dev);
		goto fail;
	}

	rc = 0;
fail:
	return rc;
}
module_init(smsgiucv_app_init);

static void __exit smsgiucv_app_exit(void)
{
	/* unregister callback */
	smsg_unregister_callback(SMSG_PREFIX, smsg_app_callback);

	/* cancel pending work and flush any queued event work */
	cancel_work_sync(&smsg_event_work);
	smsg_event_work_fn(&smsg_event_work);

	device_unregister(smsg_app_dev);
}
module_exit(smsgiucv_app_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Deliver z/VM CP SMSG as uevents");
MODULE_AUTHOR("Hendrik Brueckner <brueckner@linux.vnet.ibm.com>");

Annotation

Implementation Notes