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Subject[PATCH] 2.4.23-pre3 ACPI fixes series (2/3)
Date
This patch retries IRQ programming with an extended IRQ resource descriptor
if using a standard IRQ descriptor fails.


--- linux-2.4.23-pre3.picmode/drivers/acpi/pci_link.c 2003-09-05 23:54:45.522947816 +0100
+++ linux-2.4.23-pre3.extirq/drivers/acpi/pci_link.c 2003-09-05 23:54:59.945755216 +0100
@@ -290,7 +290,8 @@
struct acpi_buffer buffer = {sizeof(resource)+1, &resource};
int i = 0;
int valid = 0;
-
+ int resource_type = 0;
+
ACPI_FUNCTION_TRACE("acpi_pci_link_set");

if (!link || !irq)
@@ -312,13 +313,24 @@
return_VALUE(-EINVAL);
}
}
+
+ /* If IRQ<=15, first try with a "normal" IRQ descriptor. If that fails, try with
+ * an extended one */
+ if (irq <= 15) {
+ resource_type = ACPI_RSTYPE_IRQ;
+ } else {
+ resource_type = ACPI_RSTYPE_EXT_IRQ;
+ }
+
+retry_programming:

memset(&resource, 0, sizeof(resource));

/* NOTE: PCI interrupts are always level / active_low / shared. But not all
interrupts > 15 are PCI interrupts. Rely on the ACPI IRQ definition for
parameters */
- if (irq <= 15) {
+ switch(resource_type) {
+ case ACPI_RSTYPE_IRQ:
resource.res.id = ACPI_RSTYPE_IRQ;
resource.res.length = sizeof(struct acpi_resource);
resource.res.data.irq.edge_level = link->irq.edge_level;
@@ -326,8 +338,9 @@
resource.res.data.irq.shared_exclusive = ACPI_SHARED;
resource.res.data.irq.number_of_interrupts = 1;
resource.res.data.irq.interrupts[0] = irq;
- }
- else {
+ break;
+
+ case ACPI_RSTYPE_EXT_IRQ:
resource.res.id = ACPI_RSTYPE_EXT_IRQ;
resource.res.length = sizeof(struct acpi_resource);
resource.res.data.extended_irq.producer_consumer = ACPI_CONSUMER;
@@ -337,11 +350,21 @@
resource.res.data.extended_irq.number_of_interrupts = 1;
resource.res.data.extended_irq.interrupts[0] = irq;
/* ignore resource_source, it's optional */
+ break;
}
resource.end.id = ACPI_RSTYPE_END_TAG;

/* Attempt to set the resource */
status = acpi_set_current_resources(link->handle, &buffer);
+
+ /* if we failed and IRQ <= 15, try again with an extended descriptor */
+ if (ACPI_FAILURE(status) && (resource_type == ACPI_RSTYPE_IRQ)) {
+ resource_type = ACPI_RSTYPE_EXT_IRQ;
+ printk(PREFIX "Retrying with extended IRQ descriptor\n");
+ goto retry_programming;
+ }
+
+ /* check for total failure */
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
return_VALUE(-ENODEV);
-
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