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[PATCH] adjust /dev/{kmem,mem,port} write handlers 

The /dev/mem and /dev/kmem write handlers weren't fully POSIX compliant in
that they wouldn't always force the file pointer to be updated when
returning success status.

The /dev/port write handler was inconsistent with the /dev/mem and
/dev/kmem handlers in that when encountering a -EFAULT condition after
already having written a number of items it would return -EFAULT rather
than the number of bytes written.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-03-25 03:07:31 -08:00 committed by Linus Torvalds
parent 58bf6a2db2
commit c654d60e8f
1 changed files with 13 additions and 15 deletions
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28
drivers/char/mem.c
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@ -216,11 +216,9 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
copied = copy_from_user(ptr, buf, sz);
if (copied) {
ssize_t ret;
ret = written + (sz - copied);
if (ret)
return ret;
written += sz - copied;
if (written)
break;
return -EFAULT;
}
buf += sz;
@ -456,11 +454,9 @@ do_write_kmem(void *p, unsigned long realp, const char __user * buf,
copied = copy_from_user(ptr, buf, sz);
if (copied) {
ssize_t ret;
ret = written + (sz - copied);
if (ret)
return ret;
written += sz - copied;
if (written)
break;
return -EFAULT;
}
buf += sz;
@ -514,11 +510,10 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
if (len) {
written = copy_from_user(kbuf, buf, len);
if (written) {
ssize_t ret;
if (wrote + virtr)
break;
free_page((unsigned long)kbuf);
ret = wrote + virtr + (len - written);
return ret ? ret : -EFAULT;
return -EFAULT;
}
}
len = vwrite(kbuf, (char *)p, len);
@ -563,8 +558,11 @@ static ssize_t write_port(struct file * file, const char __user * buf,
return -EFAULT;
while (count-- > 0 && i < 65536) {
char c;
if (__get_user(c, tmp))
if (__get_user(c, tmp)) {
if (tmp > buf)
break;
return -EFAULT;
}
outb(c,i);
i++;
tmp++;