device: add device_shutdown_by_driver() helper

euler inclusion
category: bugfix
bugzilla: 5452
CVE: NA

This patchset is add a kernel parameter to avoid kdump
problem on Hi1620ES. It will be revert when we have better
solution on Hi1620CS.

[PATCH 1/4] Revert "iommu/arm-smmu-v3: Abort all transactions if SMMU is enabled in kdump kernel"
[PATCH 2/4] device: add device_shutdown_one() helper
[PATCH 3/4] device: add device_shutdown_by_driver() helper
[PATCH 4/4] kexec: add kexec_device_shutdown()

------------------------------------------------

Add device_shutdown_by_driver() helper that shutdown
the devices through driver name
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/base/core.c

@@ -2929,6 +2929,36 @@ void device_shutdown(void)
 	spin_unlock(&devices_kset->list_lock);
 }
 
+void device_shutdown_by_driver(char *drv_name)
+{
+	struct device *dev, *parent, *next;
+	int len = 0;
+
+	if (!drv_name)
+		return;
+
+	len = strlen(drv_name);
+	if (!len)
+		return;
+
+	wait_for_device_probe();
+	device_block_probing();
+
+	spin_lock(&devices_kset->list_lock);
+	list_for_each_entry_safe(dev, next, &devices_kset->list, kobj.entry) {
+		if (dev->driver && len == strlen(dev->driver->name) &&
+		    !strncmp(dev->driver->name, drv_name, len)) {
+			parent = get_device(dev->parent);
+			get_device(dev);
+			list_del(&dev->kobj.entry);
+			spin_unlock(&devices_kset->list_lock);
+			device_shutdown_one(dev, parent);
+			spin_lock(&devices_kset->list_lock);
+		}
+	}
+	spin_unlock(&devices_kset->list_lock);
+}
+
 /*
  * Device logging functions
  */

include/linux/device.h

@@ -1321,6 +1321,7 @@ static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
 
 /* drivers/base/power/shutdown.c */
 extern void device_shutdown(void);
+extern void device_shutdown_by_driver(char *drv_name);
 
 /* debugging and troubleshooting/diagnostic helpers. */
 extern const char *dev_driver_string(const struct device *dev);