Date: Wed, 28 Dec 2011 14:53:42 +0000 From: Chris Rees <utisoft@gmail.com> To: Kostik Belousov <kostikbel@gmail.com> Cc: hackers@freebsd.org Subject: Re: Checking for other kernel modules on load Message-ID: <CADLo83-OBNWzY_r_oFmUBjkNoCpifJ0_u9dYN52YTZ69X06o4Q@mail.gmail.com> In-Reply-To: <20111228135641.GV50300@deviant.kiev.zoral.com.ua> References: <CADLo838QjrUunABB=3R_d6NO9bnNAcKXM%2BZt3DRam3RnOGnxGw@mail.gmail.com> <B8D5A1B2-4790-48CA-AAC3-D4333D52ECEB@gsoft.com.au> <CADLo8382uPC6YmreCz8irVuiOhSwc2axJTgQRpVJk-%2B0Win8rQ@mail.gmail.com> <20111228135641.GV50300@deviant.kiev.zoral.com.ua>
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2011/12/28 Kostik Belousov <kostikbel@gmail.com>:
> On Wed, Dec 28, 2011 at 12:23:58PM +0000, Chris Rees wrote:
>> On 28 December 2011 12:21, Daniel O'Connor <doconnor@gsoft.com.au> wrote=
:
>> >
>> > On 28/12/2011, at 22:07, Chris Rees wrote:
>> >> Is there a simple way to check for existence of a driver? =A0I could
>> >> even check for /dev/sndstat, though that doesn't seem elegant to me..=
.
>> >
>> > kldstat -v, but really /dev/sndstat seems simpler and just as effectiv=
e.
>> >
>>
>> Cheers-- I was thinking of a kernel-level function though.
>>
>> cognet@ suggested using modfind("sound"), I'll go with that.
> Obvious question is what the panic is. Checking for modules loaded is
> papering over some issue.
True, although I figured that it was a simple conflict, possibly to do
with sndstat.
Also, I'm getting panics with the following patch, whether sound is
loaded or not :)
+ if (modfind("sound") >=3D 0)
+ {
+ cmn_err (CE_WARN, "A conflicting sound driver is already loaded");
+ return EBUSY;
+ }
+
Is there a better way to handle such conflicts?
Chris
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