--- ./drivers/char/mem.c.fix	2004-03-13 17:56:09.000000000 +0100
+++ ./drivers/char/mem.c	2004-03-13 20:36:35.000000000 +0100
@@ -102,7 +102,7 @@
 }
 #endif
 
-static ssize_t do_write_mem(struct file * file, void *p, unsigned long realp,
+static ssize_t do_write_mem(void *p, unsigned long realp,
 			    const char * buf, size_t count, loff_t *ppos)
 {
 	ssize_t written;
@@ -171,7 +171,7 @@
 
 	if (!valid_phys_addr_range(p, &count))
 		return -EFAULT;
-	return do_write_mem(file, __va(p), p, buf, count, ppos);
+	return do_write_mem(__va(p), p, buf, count, ppos);
 }
 
 static int mmap_mem(struct file * file, struct vm_area_struct * vma)
@@ -282,7 +282,9 @@
 		if (count > (unsigned long) high_memory - p)
 			wrote = (unsigned long) high_memory - p;
 
-		wrote = do_write_mem(file, (void*)p, p, buf, wrote, ppos);
+		wrote = do_write_mem((void*)p, p, buf, wrote, ppos);
+		if (wrote < 0)
+			return wrote;
 
 		p += wrote;
 		buf += wrote;