/dev/mem: remove the "written" variable in write_kmem()

Also rename "len" to "sz". No behavior change.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Avi Kivity <avi@qumranet.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 192af59..868ff2c 100644 (file)
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -440,19 +440,18 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
                if (!kbuf)
                        return -ENOMEM;
                while (count > 0) {
-                       int len = size_inside_page(p, count);
-
-                       len = vread(kbuf, (char *)p, len);
-                       if (!len)
+                       sz = size_inside_page(p, count);
+                       sz = vread(kbuf, (char *)p, sz);
+                       if (!sz)
                                break;
-                       if (copy_to_user(buf, kbuf, len)) {
+                       if (copy_to_user(buf, kbuf, sz)) {
                                free_page((unsigned long)kbuf);
                                return -EFAULT;
                        }
-                       count -= len;
-                       buf += len;
-                       read += len;
-                       p += len;
+                       count -= sz;
+                       buf += sz;
+                       read += sz;
+                       p += sz;
                }
                free_page((unsigned long)kbuf);
        }
@@ -522,19 +521,14 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
        unsigned long p = *ppos;
        ssize_t wrote = 0;
        ssize_t virtr = 0;
-       ssize_t written;
        char * kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */
 
        if (p < (unsigned long) high_memory) {
-
-               wrote = count;
-               if (count > (unsigned long) high_memory - p)
-                       wrote = (unsigned long) high_memory - p;
-
-               written = do_write_kmem((void*)p, p, buf, wrote, ppos);
-               if (written != wrote)
-                       return written;
-               wrote = written;
+               unsigned long to_write = min_t(unsigned long, count,
+                                              (unsigned long)high_memory - p);
+               wrote = do_write_kmem((void *)p, p, buf, to_write, ppos);
+               if (wrote != to_write)
+                       return wrote;
                p += wrote;
                buf += wrote;
                count -= wrote;
@@ -545,20 +539,21 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
                if (!kbuf)
                        return wrote ? wrote : -ENOMEM;
                while (count > 0) {
-                       int len = size_inside_page(p, count);
+                       unsigned long sz = size_inside_page(p, count);
+                       unsigned long n;
 
-                       written = copy_from_user(kbuf, buf, len);
-                       if (written) {
+                       n = copy_from_user(kbuf, buf, sz);
+                       if (n) {
                                if (wrote + virtr)
                                        break;
                                free_page((unsigned long)kbuf);
                                return -EFAULT;
                        }
-                       len = vwrite(kbuf, (char *)p, len);
-                       count -= len;
-                       buf += len;
-                       virtr += len;
-                       p += len;
+                       sz = vwrite(kbuf, (char *)p, sz);
+                       count -= sz;
+                       buf += sz;
+                       virtr += sz;
+                       p += sz;
                }
                free_page((unsigned long)kbuf);
        }