Re: [PATCH] Revert "debugfs: ->d_parent is never NULL or negative"

From: Sinan Kaya
Date: Thu Oct 06 2016 - 19:22:01 EST

On 10/6/2016 6:41 PM, Al Viro wrote:
> On Thu, Oct 06, 2016 at 11:37:29PM +0100, Al Viro wrote:
>> If you ever get NULL in ->d_parent of struct dentry instance, you are
>> practically certain to have a dangling pointer to memory that used to
>> contain a struct dentry at some point but got freed and reused since then.
> ... which is what happens in your case, apparently. ->stats is still
> pointing to a dentry that had just been freed and its memory reused.

Thanks for explaining the behavior. I posted the change a minute ago
and forgot to include you.

dmaengine: qcom_hidma: remove useless debugfs file removal

I have a very similar problem with sysfs now. It looks like the new kernel
is more assertive than the older ones.

I'll post the sysfs change in a minute.

Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.