add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/video/fbdev/arcfb.c
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@@ -419,6 +419,8 @@
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 			schedule();
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 			finish_wait(&arcfb_waitq, &wait);
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 		}
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+		fallthrough;
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+
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 		case FBIO_GETCONTROL2:
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 		{
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 			unsigned char ctl2;
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@@ -489,7 +491,7 @@
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 	return err;
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 }
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-static struct fb_ops arcfb_ops = {
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+static const struct fb_ops arcfb_ops = {
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 	.owner		= THIS_MODULE,
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 	.fb_open	= arcfb_open,
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 	.fb_read        = fb_sys_read,
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@@ -521,7 +523,7 @@
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 	info = framebuffer_alloc(sizeof(struct arcfb_par), &dev->dev);
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 	if (!info)
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-		goto err;
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+		goto err_fb_alloc;
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 	info->screen_base = (char __iomem *)videomemory;
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 	info->fbops = &arcfb_ops;
..
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@@ -533,7 +535,7 @@
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 	if (!dio_addr || !cio_addr || !c2io_addr) {
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 		printk(KERN_WARNING "no IO addresses supplied\n");
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-		goto err1;
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+		goto err_addr;
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 	}
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 	par->dio_addr = dio_addr;
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 	par->cio_addr = cio_addr;
..
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@@ -542,10 +544,6 @@
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 	par->cslut[1] = 0x06;
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 	info->flags = FBINFO_FLAG_DEFAULT;
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 	spin_lock_init(&par->lock);
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-	retval = register_framebuffer(info);
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-	if (retval < 0)
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-		goto err1;
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-	platform_set_drvdata(dev, info);
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 	if (irq) {
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 		par->irq = irq;
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 		if (request_irq(par->irq, &arcfb_interrupt, IRQF_SHARED,
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@@ -553,9 +551,13 @@
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 			printk(KERN_INFO
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 				"arcfb: Failed req IRQ %d\n", par->irq);
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 			retval = -EBUSY;
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-			goto err1;
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+			goto err_addr;
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 		}
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 	}
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+	retval = register_framebuffer(info);
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+	if (retval < 0)
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+		goto err_register_fb;
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+	platform_set_drvdata(dev, info);
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 	fb_info(info, "Arc frame buffer device, using %dK of video memory\n",
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 		videomemorysize >> 10);
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..
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@@ -578,9 +580,12 @@
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 	}
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 	return 0;
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-err1:
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+
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+err_register_fb:
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+	free_irq(par->irq, info);
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+err_addr:
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 	framebuffer_release(info);
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-err:
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+err_fb_alloc:
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 	vfree(videomemory);
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 	return retval;
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 }
..
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@@ -591,6 +596,8 @@
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 	if (info) {
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 		unregister_framebuffer(info);
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+		if (irq)
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+			free_irq(((struct arcfb_par *)(info->par))->irq, info);
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 		vfree((void __force *)info->screen_base);
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 		framebuffer_release(info);
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 	}