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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-06-10 12:43:02 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-07-12 13:02:09 -0700 |
| commit | eb8d3c604fe7496323efb9a858bef84c489ca584 (patch) | |
| tree | fe47cc2d57f7a7e2ba7936b7a89bbd49caf5bb5c /drivers/base/devres.c | |
| parent | 81e4e1ba7ed4a1fdcf0e2ee944f1575010471464 (diff) | |
| download | linux-eb8d3c604fe7496323efb9a858bef84c489ca584.tar.gz | |
devres: WARN() and return, don't crash on device_del() of uninitialized device
I just debugged an obscure crash caused by a device_del() of a all NULL'd out struct device (in usb-serial) and found that a patch like this one would have saved me time (in addition to improved chances of a bug report from users hitting similar driver bugs). [akpm@linux-foundation.org: cleanup] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/devres.c')
| -rw-r--r-- | drivers/base/devres.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/devres.c b/drivers/base/devres.c index e8beb8e5b626..05dd307e8f02 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -428,6 +428,9 @@ int devres_release_all(struct device *dev) { unsigned long flags; + /* Looks like an uninitialized device structure */ + if (WARN_ON(dev->devres_head.next == NULL)) + return -ENODEV; spin_lock_irqsave(&dev->devres_lock, flags); return release_nodes(dev, dev->devres_head.next, &dev->devres_head, flags); |