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mtip32xx: Fix NULL pointer dereference during module unload

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An open file-handle to one or more of the driver exported debugfs
nodes causes raciness in recursive removal during module unload;
sometimes a stale parent dentry is dereferenced when more than 1
pci device is present.

Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Sam Bradshaw 2013-05-15 10:04:34 +02:00 committed by Jens Axboe
parent f722406faa
commit 974a51a245
1 changed files with 2 additions and 1 deletions
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3
drivers/block/mtip32xx/mtip32xx.c
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@ -3002,7 +3002,8 @@ static int mtip_hw_debugfs_init(struct driver_data *dd)
static void mtip_hw_debugfs_exit(struct driver_data *dd)
{
debugfs_remove_recursive(dd->dfs_node);
if (dd->dfs_node)
debugfs_remove_recursive(dd->dfs_node);
}