[PATCH] request_region in acornscsi.c

Rusty Russell <rusty@rustcorp.com.au>: 13) request_region check, 11-20:

drivers/acorn/scsi/acornscsi.c

@@ -2915,13 +2915,18 @@ int acornscsi_detect(Scsi_Host_Template * tpnt)
 	ecs[count]->irqaddr	= (char *)ioaddr(host->card.io_intr);
 	ecs[count]->irqmask	= 0x0a;
 
-	request_region(instance->io_port + 0x800,  2, "acornscsi(sbic)");
-	request_region(host->card.io_intr,  1, "acornscsi(intr)");
-	request_region(host->card.io_page,  1, "acornscsi(page)");
+	if (!request_region(instance->io_port + 0x800,  2, "acornscsi(sbic)"))
+		goto err_1;
+	if (!request_region(host->card.io_intr,  1, "acornscsi(intr)"))
+		goto err_2;
+	if (!request_region(host->card.io_page,  1, "acornscsi(page)"))
+		goto err_3;
 #ifdef USE_DMAC
-	request_region(host->dma.io_port, 256, "acornscsi(dmac)");
+	if (!request_region(host->dma.io_port, 256, "acornscsi(dmac)"))
+		goto err_4;
 #endif
-	request_region(instance->io_port, 2048, "acornscsi(ram)");
+	if (!request_region(instance->io_port, 2048, "acornscsi(ram)"))
+		goto err_5;
 
 	if (request_irq(host->scsi.irq, acornscsi_intr, SA_INTERRUPT, "acornscsi", host)) {
 	    printk(KERN_CRIT "scsi%d: IRQ%d not free, interrupts disabled\n",
@@ -2934,6 +2939,20 @@ int acornscsi_detect(Scsi_Host_Template * tpnt)
 	++count;
     }
     return count;
+    
+err_5:
+#ifdef USE_DMAC
+    release_region(host->dma.io_port, 256);
+#endif
+err_4:
+    release_region(host->card.io_page, 1);
+err_3:
+    release_region(host->card.io_intr, 1);    
+err_2:
+    release_region(instance->io_port + 0x800, 2);
+err_1:
+    scsi_unregister(instance);
+    return 0;
 }
 
 /*