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SubjectRe: [RFC][PATCH 6/6] PCI PM: pci_save/restore_state improvements
On Tue, Nov 15, 2005 at 10:31:42PM -0500, Adam Belay wrote:
> This patch makes some improvements to pci_save_state and
> pci_restore_state. Instead of saving and restoring all standard
> registers (even read-only ones), it only restores necessary registers.
> Also, the command register is handled more carefully. Let me know if
> I'm missing anything important.
>
>
> --- a/drivers/pci/pm.c 2005-11-13 20:32:24.000000000 -0500
> +++ b/drivers/pci/pm.c 2005-11-13 20:29:32.000000000 -0500
> @@ -53,10 +53,13 @@
> */
> int pci_save_state(struct pci_dev *dev)
> {
> - int i;
> - /* XXX: 100% dword access ok here? */
> - for (i = 0; i < 16; i++)
> - pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]);
> + struct pci_dev_config * conf = &dev->saved_config;
> +
> + pci_read_config_word(dev, PCI_COMMAND, &conf->command);
> + pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &conf->cacheline_size);
> + pci_read_config_byte(dev, PCI_LATENCY_TIMER, &conf->latency_timer);
> + pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &conf->interrupt_line);

Why are we saving and restoring smaller ammounts of config space now?

thanks,

greg k-h
-
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