dmaengine: idxd: add driver name

Add name field in idxd_device_driver so we don't have to touch the
'struct device_driver' during declaration.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162637459517.744545.7572915135318813722.stgit@djiang5-desk3.ch.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/idxd/idxd.h

@@ -34,6 +34,7 @@ enum idxd_type {
 #define IDXD_PMU_EVENT_MAX	64
 
 struct idxd_device_driver {
+	const char *name;
 	struct device_driver drv;
 };
 

drivers/dma/idxd/init.c

@@ -861,6 +861,7 @@ int __idxd_driver_register(struct idxd_device_driver *idxd_drv, struct module *o
 {
 	struct device_driver *drv = &idxd_drv->drv;
 
+	drv->name = idxd_drv->name;
 	drv->bus = &dsa_bus_type;
 	drv->owner = owner;
 	drv->mod_name = mod_name;

drivers/dma/idxd/sysfs.c

@@ -311,9 +311,7 @@ struct bus_type dsa_bus_type = {
 };
 
 static struct idxd_device_driver dsa_drv = {
-	.drv = {
-		.name = "dsa",
-	},
+	.name = "dsa",
 };
 
 /* IDXD generic driver setup */