Re: [stable] [PATCH] sbp2: fix check of return value of hpsb_allocate_and_register_addrspace

[Michael Tokarev <mjt@tls.msk.ru>]

Stefan Richter wrote:
> Chris Wright wrote:
>> * Stefan Richter (stefanr@s5r6.in-berlin.de) wrote:
> ....
>>> +++ linux-2.6.17-rc5/drivers/ieee1394/sbp2.c    2006-06-03
>>> 01:54:23.000000000 +0200
>>> @@ -845,7 +845,7 @@ static struct scsi_id_instance_data *sbp
>>>             &sbp2_highlevel, ud->ne->host, &sbp2_ops,
>>>             sizeof(struct sbp2_status_block), sizeof(quadlet_t),
>>>             0x010000000000ULL, CSR1212_ALL_SPACE_END);
>>> -    if (!scsi_id->status_fifo_addr) {
>>> +    if (scsi_id->status_fifo_addr == ~0ULL) {

Umm.  Can this ~0ULL constant be #define'd to something?
It's way too simple to mis-read it as NULL (or ~NULL whatever).

I mean.. I looked at this change for quite some time, trying to
figure a difference (!x vs x==NULL), and thinking what's '-0'
(~ turned out to be quite similar to - in the font my thunderbird
uses).

/mjt