Date: Mon, 8 Nov 2010 09:47:38 -0800 From: Garrett Cooper <yanegomi@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: [PATCH] mptutil(8) - capture errors and percolate up to caller Message-ID: <AANLkTikAOehozECYANWNsDf8LdhE6H-Mg5rs7bPmw=Uc@mail.gmail.com> In-Reply-To: <201011080958.39156.jhb@freebsd.org> References: <AANLkTinK_gPuqke7UAusJVV6apK0w=gU3sHjBsjhd00r@mail.gmail.com> <201011080958.39156.jhb@freebsd.org>
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On Mon, Nov 8, 2010 at 6:58 AM, John Baldwin <jhb@freebsd.org> wrote:
> On Saturday, November 06, 2010 4:13:23 am Garrett Cooper wrote:
>> =A0 =A0 Similar to r214396, this patch deals with properly capturing err=
or
>> and passing it up to the caller in mptutil just in case the errno
>> value gets stomped on by warn*(3); this patch deals with an improper
>> use of warn(3), and also some malloc(3) errors, as well as shrink down
>> some static buffers to fit the data being output.
>> =A0 =A0 If someone could review and help me commit this patch it would b=
e
>> much appreciated; all I could do is run negative tests on my local box
>> and minor positive tests on my vmware fusion instance because it
>> doesn't fully emulate a fully working mpt(4) device (the vmware
>> instance consistently crashed with a warning about the mpt
>> controller's unimplemented features after I poked at it enough).
>> =A0 =A0 I'll submit another patch to fix up style(9) in this app if requ=
ested.
>> Thanks!
>
> The explicit 'return (ENOMEM)' calls are fine as-is. =A0I do not think th=
ey need
> changing.
I'll changed back all of the other *alloc calls (I was just
thinking about all of the other awesome cases that malloc can fail,
but if we break that assumption a lot more of our programs would break
too unfortunately :(...).
I read up on cam_getccb and I agree based on the description today:
"cam_getccb() allocates a CCB using malloc(3) and sets fields in the C=
CB
header using values from the cam_device structure."
But if it called something else in cam_getccb other than malloc it
might confuse the end-user if it failed *shrugs*... But whatever, that
would have to be a wholesale change if things changed in this area so
I'll default to being lazy now :) (I'm almost positive Scott did that
because he understands the overall system a lot better than me :D..).
> Having static char arrays of '15' rather than '16' is probably pointless.=
=A0The
> stack is already at least 4-byte aligned on all the architectures we supp=
ort,
> so a 15-byte char array will actually be 16 bytes. =A0It was chose to be =
a good
> enough value, not an exact fit. =A0An exact fit is not important here.
Yeah, that was stupid micro-optimization on my part.
> Moving the 'buf' in mpt_raid_level() is a style bug. =A0It should stay wh=
ere it
> is. =A0Same with 'buf' in mpt_volstate() and mpt_pdstate().
Same as above.
> IOC_STATUS_SUCCESS() returns a boolean, it is appropriate to test it with=
!
> rather than =3D=3D 0. =A0It is also easier for a person to read the code =
that way.
Good point. I didn't catch that part in style(9) before now.
Thanks for the review!
-Garrett
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