Date: Fri, 25 Sep 1998 08:06:33 +1000 From: Bruce Evans <bde@zeta.org.au> To: gibbs@plutotech.com, mike@smith.net.au Cc: bde@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: options DPT_LOST_IRQ Message-ID: <199809242206.IAA31935@godzilla.zeta.org.au>
next in thread | raw e-mail | index | archive | help
>If it stops asserting the interrupt, we should get a stray interrupt >reported when we go to clear the pending mask. Is this what is happening? No to the "should" statement. Stray interrupts are only reported when an interrupt goes away during the middle of an interrupt acknowledge cycle. This should be extremely rare. However, returning from an interrupt handler a little too soon (only for broken/slow hardware?) may cause a race between the device deasserting the interrupt and clearing the interupt mask (the mask in the CPU or the PIC; it's on a different device so their is no synchronization except for the CPU's guarantee to serialize i/o). Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199809242206.IAA31935>