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drivers/watchdog/lantiq_wdt.c: drop iounmap for devm_ allocated data 

Data allocated with devm_ioremap or devm_ioremap_nocache should not be
freed using iounmap, because doing so causes a dangling pointer, and a
subsequent double free.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
expression x;
@@
(
 x = devm_ioremap(...)
|
 x = devm_ioremap_nocache(...)
)

@@
expression r.x;
@@
* iounmap(x)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Julia Lawall 2011-12-26 18:38:00 +01:00 committed by Wim Van Sebroeck
parent 02861cca4b
commit 60daac4a90
1 changed files with 0 additions and 3 deletions
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3
drivers/watchdog/lantiq_wdt.c
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@ -222,9 +222,6 @@ ltq_wdt_remove(struct platform_device *pdev)
{
misc_deregister(&ltq_wdt_miscdev);
if (ltq_wdt_membase)
iounmap(ltq_wdt_membase);
return 0;
}