From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Cochran <richardcochran@gmail.com>
Subject: Re: [PATCH] ptp: fix an IS_ERR() vs NULL check
Date: Fri, 30 Nov 2018 08:32:52 -0800
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To: Dan Carpenter <dan.carpenter@oracle.com>
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On Fri, Nov 30, 2018 at 03:58:34PM +0300, Dan Carpenter wrote:
> The pps_register_source() function doesn't return NULL, it returns
> error pointers.

It keeps a local variable for errno, but then it returns NULL.
But this is about to change with this recent patch:

   26.Nov'18 YueHaibing [PATCH -next] pps: using ERR_PTR instead of NULL while pps_register_source fails

It hasn't been merged yet AFAICT, but gregkh said he take it.

Thanks,
Richard