disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/tty/hvc/hvc_xen.c
..
..
@@ -52,17 +52,22 @@
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52
 
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 static struct xencons_info *vtermno_to_xencons(int vtermno)
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 {
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-	struct xencons_info *entry, *n, *ret = NULL;
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+	struct xencons_info *entry, *ret = NULL;
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+	unsigned long flags;
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57
 
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-	if (list_empty(&xenconsoles))
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-			return NULL;
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+	spin_lock_irqsave(&xencons_lock, flags);
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+	if (list_empty(&xenconsoles)) {
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+		spin_unlock_irqrestore(&xencons_lock, flags);
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+		return NULL;
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+	}
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63
 
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-	list_for_each_entry_safe(entry, n, &xenconsoles, list) {
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+	list_for_each_entry(entry, &xenconsoles, list) {
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 		if (entry->vtermno == vtermno) {
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 			ret  = entry;
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 			break;
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 		}
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 	}
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+	spin_unlock_irqrestore(&xencons_lock, flags);
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 	return ret;
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 }
..
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@@ -223,7 +228,7 @@
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 {
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 	int r;
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 	uint64_t v = 0;
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-	unsigned long gfn;
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+	unsigned long gfn, flags;
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 	struct xencons_info *info;
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233
 
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 	if (!xen_hvm_domain())
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@@ -258,9 +263,9 @@
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 		goto err;
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 	info->vtermno = HVC_COOKIE;
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265
 
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-	spin_lock(&xencons_lock);
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+	spin_lock_irqsave(&xencons_lock, flags);
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 	list_add_tail(&info->list, &xenconsoles);
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-	spin_unlock(&xencons_lock);
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+	spin_unlock_irqrestore(&xencons_lock, flags);
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 	return 0;
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 err:
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@@ -283,6 +288,7 @@
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 static int xen_pv_console_init(void)
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 {
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 	struct xencons_info *info;
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+	unsigned long flags;
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292
 
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 	if (!xen_pv_domain())
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 		return -ENODEV;
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@@ -299,9 +305,9 @@
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 		/* already configured */
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 		return 0;
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 	}
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-	spin_lock(&xencons_lock);
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+	spin_lock_irqsave(&xencons_lock, flags);
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 	xencons_info_pv_init(info, HVC_COOKIE);
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-	spin_unlock(&xencons_lock);
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+	spin_unlock_irqrestore(&xencons_lock, flags);
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 	return 0;
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 }
..
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@@ -309,6 +315,7 @@
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 static int xen_initial_domain_console_init(void)
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 {
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 	struct xencons_info *info;
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+	unsigned long flags;
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 	if (!xen_initial_domain())
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 		return -ENODEV;
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@@ -323,9 +330,9 @@
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 	info->irq = bind_virq_to_irq(VIRQ_CONSOLE, 0, false);
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 	info->vtermno = HVC_COOKIE;
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-	spin_lock(&xencons_lock);
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+	spin_lock_irqsave(&xencons_lock, flags);
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 	list_add_tail(&info->list, &xenconsoles);
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-	spin_unlock(&xencons_lock);
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+	spin_unlock_irqrestore(&xencons_lock, flags);
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336
 
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 	return 0;
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 }
..
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@@ -380,10 +387,12 @@
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387
 
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 static int xen_console_remove(struct xencons_info *info)
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 {
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+	unsigned long flags;
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+
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 	xencons_disconnect_backend(info);
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-	spin_lock(&xencons_lock);
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+	spin_lock_irqsave(&xencons_lock, flags);
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 	list_del(&info->list);
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-	spin_unlock(&xencons_lock);
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+	spin_unlock_irqrestore(&xencons_lock, flags);
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 	if (info->xbdev != NULL)
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 		xencons_free(info);
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 	else {
..
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@@ -464,6 +473,7 @@
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 {
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 	int ret, devid;
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 	struct xencons_info *info;
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+	unsigned long flags;
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477
 
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 	devid = dev->nodename[strlen(dev->nodename) - 1] - '0';
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 	if (devid == 0)
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@@ -482,9 +492,9 @@
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 	ret = xencons_connect_backend(dev, info);
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 	if (ret < 0)
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 		goto error;
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-	spin_lock(&xencons_lock);
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+	spin_lock_irqsave(&xencons_lock, flags);
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 	list_add_tail(&info->list, &xenconsoles);
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-	spin_unlock(&xencons_lock);
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+	spin_unlock_irqrestore(&xencons_lock, flags);
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498
 
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 	return 0;
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500
 
..
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@@ -527,7 +537,7 @@
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 	case XenbusStateClosed:
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 		if (dev->state == XenbusStateClosed)
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 			break;
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-		/* Missed the backend's CLOSING state -- fallthrough */
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+		fallthrough;	/* Missed the backend's CLOSING state */
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541
 	case XenbusStateClosing:
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 		xenbus_frontend_closed(dev);
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 		break;
..
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@@ -583,10 +593,12 @@
583
593
 
584
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 	info->hvc = hvc_alloc(HVC_COOKIE, info->irq, ops, 256);
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 	if (IS_ERR(info->hvc)) {
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+		unsigned long flags;
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+
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 		r = PTR_ERR(info->hvc);
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-		spin_lock(&xencons_lock);
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+		spin_lock_irqsave(&xencons_lock, flags);
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 		list_del(&info->list);
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-		spin_unlock(&xencons_lock);
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+		spin_unlock_irqrestore(&xencons_lock, flags);
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 		if (info->irq)
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 			unbind_from_irqhandler(info->irq, NULL);
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 		kfree(info);
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@@ -638,7 +650,7 @@
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 #endif
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 #ifdef CONFIG_EARLY_PRINTK
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-static int __init xenboot_setup_console(struct console *console, char *string)
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+static int __init xenboot_console_setup(struct console *console, char *string)
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 {
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 	static struct xencons_info xenboot;
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656
 
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@@ -682,7 +694,7 @@
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 struct console xenboot_console = {
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 	.name		= "xenboot",
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 	.write		= xenboot_write_console,
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-	.setup		= xenboot_setup_console,
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+	.setup		= xenboot_console_setup,
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 	.flags		= CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
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 	.index		= -1,
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 };