From: Ian Abbott <abbotti@mev.co.uk>
To: Dan Carpenter <dan.carpenter@oracle.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-staging@lists.linux.dev,
H Hartley Sweeten <hsweeten@visionengravers.com>,
"Spencer E . Olson" <olsonse@umich.edu>
Subject: Re: [PATCH 0/5] staging: comedi: tests: Fix various issues
Date: Thu, 15 Apr 2021 10:57:08 +0100 [thread overview]
Message-ID: <97a6c2fb-5b55-300d-1a0a-d0c150ae60ed@mev.co.uk> (raw)
In-Reply-To: <2955bb05-fa59-c35a-b5a2-a5aedb4c96a8@mev.co.uk>
On 14/04/2021 13:34, Ian Abbott wrote:
> On 14/04/2021 11:09, Dan Carpenter wrote:
>> The test_ni_get_reg_value() function calls
>> unittest(ni_get_reg_value_roffs(-1, O(0), T, 1) == -1,
>> "check bad direct trigger arg for first reg->dest w/offs\n");
>> The -1 is type promoted to a high positive value so src is greater than
>> NI_NAMES_BASE. It's not clear that that was intentional.
>> drivers/staging/comedi/drivers/tests/../ni_routes.h:269
>> ni_get_reg_value_roffs() warn: 'src' possible negative type promoted
>> to high
>
> I agree that it appears that ni_get_reg_value_roffs() will be returning
> -1 as expected, but for the wrong reason. I think the intention was for
> ni_get_reg_value_roffs() to call route_register_is_valid() with src=0 in
> this case, but it actually calls ni_route_to_register() with src=-1
> (because -1 gets converted to 0xffffffff in the test `if (src <
> NI_NAMES_BASE)` where NI_NAMES_BASE is defined as 0x8000u).
Since Spencer agrees that the existing behavior was unintentional, I
think the least disruptive fix would be change `src < NI_NAMES_BASE` to
`src < (int)NI_NAMES_BASE` in `ni_get_reg_value_roffs()` in
".../comedi/drivers/ni_routes.h".
Either that, or change the interface to use unsigned `src` and
`direct_reg_offset` values. The negative values only seem to be used by
the "ni_routes_test" unit testing module.
--
-=( Ian Abbott <abbotti@mev.co.uk> || MEV Ltd. is a company )=-
-=( registered in England & Wales. Regd. number: 02862268. )=-
-=( Regd. addr.: S11 & 12 Building 67, Europa Business Park, )=-
-=( Bird Hall Lane, STOCKPORT, SK3 0XA, UK. || www.mev.co.uk )=-
next prev parent reply other threads:[~2021-04-15 11:16 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 14:01 [PATCH 0/5] staging: comedi: tests: Fix various issues Ian Abbott
2021-04-07 14:01 ` [PATCH 1/5] staging: comedi: tests: ni_routes_test: Fix compilation error Ian Abbott
2021-04-07 14:01 ` [PATCH 2/5] staging: comedi: tests: ni_routes_test: Put complex values in parentheses Ian Abbott
2021-04-07 14:01 ` [PATCH 3/5] staging: comedi: tests: ni_routes_test: Avoid CamelCase: <RVi> Ian Abbott
2021-04-07 15:23 ` Spencer Olson
2021-04-07 14:01 ` [PATCH 4/5] staging: comedi: tests: ni_routes_test: Lines should not end with a '(' Ian Abbott
2021-04-07 14:01 ` [PATCH 5/5] staging: comedi: tests: Correct unittest_fptr Ian Abbott
2021-04-07 15:10 ` [PATCH 0/5] staging: comedi: tests: Fix various issues Greg Kroah-Hartman
2021-04-07 15:39 ` Ian Abbott
2021-04-07 15:48 ` Spencer Olson
2021-04-07 16:16 ` Ian Abbott
2021-04-07 17:26 ` Greg Kroah-Hartman
2021-04-07 18:20 ` Ian Abbott
2021-04-08 7:27 ` Greg Kroah-Hartman
2021-04-14 10:09 ` Dan Carpenter
2021-04-14 10:40 ` Ian Abbott
2021-04-14 12:34 ` Ian Abbott
2021-04-14 13:28 ` Dan Carpenter
2021-04-14 13:57 ` Spencer Olson
2021-04-14 17:24 ` Ian Abbott
2021-04-14 14:29 ` Spencer Olson
2021-04-14 17:05 ` Ian Abbott
2021-04-15 9:57 ` Ian Abbott [this message]
2021-04-14 12:40 ` Ian Abbott
2021-04-14 13:12 ` Greg Kroah-Hartman
2021-04-14 13:30 ` Dan Carpenter
2021-04-07 15:43 ` Spencer Olson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=97a6c2fb-5b55-300d-1a0a-d0c150ae60ed@mev.co.uk \
--to=abbotti@mev.co.uk \
--cc=dan.carpenter@oracle.com \
--cc=gregkh@linuxfoundation.org \
--cc=hsweeten@visionengravers.com \
--cc=linux-staging@lists.linux.dev \
--cc=olsonse@umich.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).