On Wed, Nov 01, 2006 at 07:19:37PM -0600, Linas Vepstas wrote:
> @@ -657,6 +657,10 @@ static irqreturn_t sym53c8xx_intr(int ir
> unsigned long flags;
> struct sym_hcb *np = (struct sym_hcb *)dev_id;
>
> + /* Avoid spinloop trying to handle interrupts on frozen device */
> + if (pci_channel_offline(np->s.device))
> + return IRQ_HANDLED;
> +
> if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("[");
>
> spin_lock_irqsave(np->s.host->host_lock, flags);
Just wondering ... should we really be returning HANDLED? What if the
IRQ is shared? Will the hardware de-assert the level interrupt when it
puts the device in reset (ie is this a transitory glitch?), or do we
have to cope with a screaming interrupt?
> +#define WAIT_FOR_PCI_RECOVERY 35
> + if (pci_channel_offline(np->s.device))
> + {
I prefer if () {
> +static pci_ers_result_t sym2_io_slot_reset (struct pci_dev *pdev)
> +{
> + struct sym_hcb *np = pci_get_drvdata(pdev);
> +
> + printk(KERN_INFO "%s: recovering from a PCI slot reset\n",
> + sym_name(np));
> +
> + if (pci_enable_device(pdev)) {
> + printk(KERN_ERR "%s: Unable to enable afer PCI reset\n",
> + sym_name(np));
> + return PCI_ERS_RESULT_DISCONNECT;
> + }
> +
> + pci_set_master(pdev);
> + enable_irq(pdev->irq);
Hm. If we need to call pci_set_master, then we're also going to need to
call pci_set_mwi (if appropriate) which is currently done in
sym_set_workarounds(). Except you don't have a sym_device, or a
sym_chip around at this point. Bother. Need to do some refactoring to
take care of that.
> + /* Prevent deadlock waiting on a condition that may never clear. */
> + if (unlikely(sist == 0xffff && dstat == 0xff)) {
> + if (unlikely(pci_channel_offline(np->s.device)))
> + return;
> + }
I like the first unlikely ... but I'd drop the second one. If they are
both ffff ff, I'd say it's quite likely ;-) Anyway, the first unlikely
is good enough a hint to GCC, IMO.
Thanks!
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