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drivers/hvc: Add missing of_node_put 

of_node_put is needed before discarding a value received from
of_find_node_by_name, e.g., in error handling code or when the device
node is no longer used.

The semantic match that catches the bug is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression struct device_node *n;
position p1, p2;
statement S1,S2;
expression E,E1;
expression *ptr != NULL;
@@

(
if (!(n@p1 = of_find_node_by_name(...))) S1
|
n@p1 = of_find_node_by_name(...)
)
<... when != of_node_put(n)
    when != if (...) { <+... of_node_put(n) ...+> }
    when != true !n  || ...
    when != n = E
    when != E = n
if (!n || ...) S2
...>
(
  return \(0\|<+...n...+>\|ptr\);
|
return@p2 ...;
|
n = E1
|
E1 = n
)
@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s of_find_node_by_name %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Nicolas Palix <npalix@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Nicolas Palix 2008-12-02 03:38:55 +00:00 committed by Paul Mackerras
parent b908b53d58
commit dc42149fcc
2 changed files with 6 additions and 2 deletions
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4
drivers/char/hvc_iseries.c
View File

@ -575,8 +575,10 @@ static int __init hvc_find_vtys(void)
* of console adapters.
*/
if ((num_found >= MAX_NR_HVC_CONSOLES) ||
(num_found >= VTTY_PORTS))
(num_found >= VTTY_PORTS)) {
of_node_put(vty);
break;
}
vtermno = of_get_property(vty, "reg", NULL);
if (!vtermno)

4
drivers/char/hvc_vio.c
View File

@ -153,8 +153,10 @@ static int hvc_find_vtys(void)
/* We have statically defined space for only a certain number
* of console adapters.
*/
if (num_found >= MAX_NR_HVC_CONSOLES)
if (num_found >= MAX_NR_HVC_CONSOLES) {
of_node_put(vty);
break;
}
vtermno = of_get_property(vty, "reg", NULL);
if (!vtermno)