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| author | David Brownell <dbrownell@users.sourceforge.net> | 2008-08-07 05:52:44 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-08-21 21:15:36 +0400 |
| commit | 7c2250352e11bf956c4cfa20b01ae6ba72882788 (patch) | |
| tree | 8ea27a86d737d80a77931f1bc4d59b6aa8eafca7 /drivers/base/class.c | |
| parent | bf9ca69fc8d19d4034391d3df4c35dccdef9d28c (diff) | |
| download | linux-7c2250352e11bf956c4cfa20b01ae6ba72882788.tar.xz | |
driver model: anti-oopsing medicine
Anti-oops medicine for the class iterators ... the oops was
observed when a class was implicitly referenced before it
was initialized.
[Modified by Greg to spit a warning back so someone knows to fix their code]
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/class.c')
| -rw-r--r-- | drivers/base/class.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/base/class.c b/drivers/base/class.c index 5667c2f02c51..cc5e28c8885c 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -295,6 +295,12 @@ int class_for_each_device(struct class *class, struct device *start, if (!class) return -EINVAL; + if (!class->p) { + WARN(1, "%s called for class '%s' before it was initialized", + __func__, class->name); + return -EINVAL; + } + mutex_lock(&class->p->class_mutex); list_for_each_entry(dev, &class->p->class_devices, node) { if (start) { @@ -344,6 +350,11 @@ struct device *class_find_device(struct class *class, struct device *start, if (!class) return NULL; + if (!class->p) { + WARN(1, "%s called for class '%s' before it was initialized", + __func__, class->name); + return NULL; + } mutex_lock(&class->p->class_mutex); list_for_each_entry(dev, &class->p->class_devices, node) { |