add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/xen/xenbus/xenbus_probe_frontend.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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 #define DPRINTK(fmt, ...)				\
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@@ -18,7 +19,6 @@
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 #include <linux/module.h>
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 #include <asm/page.h>
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-#include <asm/pgtable.h>
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 #include <asm/xen/hypervisor.h>
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 #include <xen/xenbus.h>
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 #include <xen/events.h>
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@@ -125,6 +125,28 @@
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 	return xenbus_dev_probe(dev);
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 }
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+static void xenbus_frontend_dev_shutdown(struct device *_dev)
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+{
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+	struct xenbus_device *dev = to_xenbus_device(_dev);
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+	unsigned long timeout = 5*HZ;
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+
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+	DPRINTK("%s", dev->nodename);
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+
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+	get_device(&dev->dev);
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+	if (dev->state != XenbusStateConnected) {
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+		pr_info("%s: %s: %s != Connected, skipping\n",
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+			__func__, dev->nodename, xenbus_strstate(dev->state));
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+		goto out;
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+	}
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+	xenbus_switch_state(dev, XenbusStateClosing);
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+	timeout = wait_for_completion_timeout(&dev->down, timeout);
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+	if (!timeout)
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+		pr_info("%s: %s timeout closing device\n",
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+			__func__, dev->nodename);
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+ out:
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+	put_device(&dev->dev);
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+}
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+
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 static const struct dev_pm_ops xenbus_pm_ops = {
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 	.suspend	= xenbus_dev_suspend,
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 	.resume		= xenbus_frontend_dev_resume,
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@@ -145,7 +167,7 @@
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 		.uevent		= xenbus_uevent_frontend,
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 		.probe		= xenbus_frontend_dev_probe,
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 		.remove		= xenbus_dev_remove,
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-		.shutdown	= xenbus_dev_shutdown,
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+		.shutdown	= xenbus_frontend_dev_shutdown,
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 		.dev_groups	= xenbus_dev_groups,
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 		.pm		= &xenbus_pm_ops,
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@@ -379,12 +401,12 @@
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 	case XenbusStateConnected:
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 		xenbus_printf(XBT_NIL, fe, "state", "%d", XenbusStateClosing);
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 		xenbus_reset_wait_for_backend(be, XenbusStateClosing);
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-		/* fall through */
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+		fallthrough;
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 	case XenbusStateClosing:
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 		xenbus_printf(XBT_NIL, fe, "state", "%d", XenbusStateClosed);
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 		xenbus_reset_wait_for_backend(be, XenbusStateClosed);
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-		/* fall through */
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+		fallthrough;
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 	case XenbusStateClosed:
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 		xenbus_printf(XBT_NIL, fe, "state", "%d", XenbusStateInitialising);