Date: Mon, 11 Mar 2002 08:53:59 -0700 From: "Justin T. Gibbs" <gibbs@scsiguy.com> To: njh@tadpole.co.uk Cc: aic7xxx@FreeBSD.ORG Subject: Re: ahc_platform_abort_scbs() Message-ID: <200203111553.g2BFrxI11226@aslan.scsiguy.com> In-Reply-To: Your message of "Mon, 11 Mar 2002 14:19:42 GMT." <200203111419.g2BEJg103612@njh-1.tadpole.co.uk>
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>ahc_platform_abort_scbs is looping on my Solaris 2.8 machine.
>
>I must be missing something, but I don't see how ahc_platform_abort_scbs()
>can do anything but loop in this bit:
>
> busyq = &dev->busyq;
> while ((acmd = TAILQ_FIRST(busyq)) != NULL) {
> ,,,
> TAILQ_REMOVE(busyq, acmd,
> acmd_links.tqe);
> ,,,
> }
>
>since TAILQ_FIRST is defined as ((head)->tqh_first and TAILQ_REMOVE doesn't up
>date tqh_first,
Yes it does. Take a look at TAILQ_INSERT_HEAD(). The "previous element"
of the first element in a TAILQ is the head structure itself. This is
why you can remove any element of a TAILQ without knowing or caring if
it is the first element in the list.
--
Justin
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