Re: [PATCH v2 1/3] ACPI: Allow PCI to be disabled for reboot

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On 12/11/2018 5:12 AM, Rafael J. Wysocki wrote:
On Sat, Dec 8, 2018 at 10:47 PM Sinan Kaya <okaya@xxxxxxxxxx> wrote:

Make PCI reboot conditional on PCI support being present on the kernel
configuration.

Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxx>

Same comment as for patch [2/3]: make the subject say clearly that
this is about CONFIG_PCI.

Sure

         case ACPI_ADR_SPACE_PCI_CONFIG:
+       {
+#ifdef CONFIG_PCI
+               unsigned int devfn;
+               struct pci_bus *bus0;
+
                 /* The reset register can only live on bus 0. */
                 bus0 = pci_find_bus(0, 0);
                 if (!bus0)
@@ -45,7 +48,10 @@ void acpi_reboot(void)
                 pci_bus_write_config_byte(bus0, devfn,
                                 (rr->address & 0xffff), reset_value);
                 break;
-
+#else
+               return;

Why not "break"?


I struggled between break and return. Existing code seems to return on failure
when bus0 is NULL. I assumed it would be more logical to return as someone could
put some code after here that assumes everything is in order.



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