diff options
author | Nicolas Palix <npalix@diku.dk> | 2008-12-01 22:38:55 -0500 |
---|---|---|
committer | Paul Mackerras <paulus@samba.org> | 2008-12-03 05:04:09 -0500 |
commit | dc42149fccda63a5d2fa4457808c3489a5111c5e (patch) | |
tree | 93cbbb568c32ac983cf7795d113ca00bc481b47e /drivers/char/hvc_vio.c | |
parent | b908b53d580c3e9aba81ebe3339c5b7b4fa8031d (diff) |
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>
Diffstat (limited to 'drivers/char/hvc_vio.c')
-rw-r--r-- | drivers/char/hvc_vio.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c index 019e0b58593d..bd62dc86b47d 100644 --- a/drivers/char/hvc_vio.c +++ b/drivers/char/hvc_vio.c | |||
@@ -153,8 +153,10 @@ static int hvc_find_vtys(void) | |||
153 | /* We have statically defined space for only a certain number | 153 | /* We have statically defined space for only a certain number |
154 | * of console adapters. | 154 | * of console adapters. |
155 | */ | 155 | */ |
156 | if (num_found >= MAX_NR_HVC_CONSOLES) | 156 | if (num_found >= MAX_NR_HVC_CONSOLES) { |
157 | of_node_put(vty); | ||
157 | break; | 158 | break; |
159 | } | ||
158 | 160 | ||
159 | vtermno = of_get_property(vty, "reg", NULL); | 161 | vtermno = of_get_property(vty, "reg", NULL); |
160 | if (!vtermno) | 162 | if (!vtermno) |