On Mon, Mar 27, 2006 at 11:37:36AM +0900, Hidetoshi Seto wrote: > - State check would be architecture dependent routine work. I read through your patches. You are proposing a very different way of handling PCI errors than the pci_error_handlers API. It seems to be much more invasive, and I don't understand why its needed or how its better. Let me be specific: In the mpt code you have a function called pciras_readl() that tries to perform an error-free read by retrying the read: do { pcierr_clear(&cookie, ioc->pcidev); val = ioread32(addr); status = pcierr_read(&cookie); } while(status && (--retries > 0)); Why not create special arch/ia_64 readl routine to do this? In that case, other device drivers would get the benefit of the retry-on-error type read. Now, you probably shouldn't put this into the default readl routine, since some devices do peculiar things if the same register is read repeatedly. Next, I notice that if the repeated read fails, then schedule_work(&mptbase_rstTask); is called. This seems to be exactly the kind of action that the pci_error_handlers API was meant to provide: if there is a pci read error that cannot be trivially recovered, then the error_detected() &c. routines would be called. The mpt device driver would then initiate a mptbase_rstTask upon one of these callbacks. Thus, in the ia64 code, if a repeated readl fails, then the ia64 reset task calls the device drivers error_detected() routine, followed by the drivers's link_reset() routine, followed by the resume() routine. For the mpt, it would probably be resume() that was a wrapper around mptbase_rstTask(). Wouldn't this work just as well? --linas - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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