PNP: support optional IRQ resources
This patch adds an IORESOURCE_IRQ_OPTIONAL flag for use when
assigning resources to a device. If the flag is set and we are
unable to assign an IRQ to the device, we can leave the IRQ
disabled but allow the overall resource allocation to succeed.
Some devices request an IRQ, but can run without an IRQ
(possibly with degraded performance). This flag lets us run
the device without the IRQ instead of just leaving the
device disabled.
This is a reimplementation of this previous change by Rene
Herman <rene.herman@gmail.com>:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3b73a223661ed137c5d3d2635f954382e94f5a43
I reimplemented this for two reasons:
- to prepare for converting all resource options into a single linked
list, as opposed to the per-resource-type lists we have now, and
- to preserve the order and number of resource options.
In PNPBIOS and ACPI, we configure a device by giving firmware a
list of resource assignments. It is important that this list
has exactly the same number of resources, in the same order,
as the "template" list we got from the firmware in the first
place.
The problem of a sound card MPU401 being left disabled for want of
an IRQ was reported by Uwe Bugla <uwe.bugla@gmx.de>.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index 48e6017..e8515ce 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -121,34 +121,46 @@
struct pnp_option *res;
/*
- * Build a functional IRQ-less variant of each MPU option.
+ * Build a functional IRQ-optional variant of each MPU option.
*/
for (res = dev->dependent; res; res = res->next) {
struct pnp_option *curr;
struct pnp_port *port;
- struct pnp_port *copy;
+ struct pnp_port *copy_port;
+ struct pnp_irq *irq;
+ struct pnp_irq *copy_irq;
port = res->port;
- if (!port || !res->irq)
+ irq = res->irq;
+ if (!port || !irq)
continue;
- copy = pnp_alloc(sizeof *copy);
- if (!copy)
+ copy_port = pnp_alloc(sizeof *copy_port);
+ if (!copy_port)
break;
- copy->min = port->min;
- copy->max = port->max;
- copy->align = port->align;
- copy->size = port->size;
- copy->flags = port->flags;
+ copy_irq = pnp_alloc(sizeof *copy_irq);
+ if (!copy_irq) {
+ kfree(copy_port);
+ break;
+ }
+
+ *copy_port = *port;
+ copy_port->next = NULL;
+
+ *copy_irq = *irq;
+ copy_irq->flags |= IORESOURCE_IRQ_OPTIONAL;
+ copy_irq->next = NULL;
curr = pnp_build_option(PNP_RES_PRIORITY_FUNCTIONAL);
if (!curr) {
- kfree(copy);
+ kfree(copy_port);
+ kfree(copy_irq);
break;
}
- curr->port = copy;
+ curr->port = copy_port;
+ curr->irq = copy_irq;
if (prev)
prev->next = curr;
@@ -157,7 +169,7 @@
prev = curr;
}
if (head)
- dev_info(&dev->dev, "adding IRQ-less MPU options\n");
+ dev_info(&dev->dev, "adding IRQ-optional MPU options\n");
return head;
}
@@ -167,10 +179,6 @@
struct pnp_option *res;
struct pnp_irq *irq;
- /*
- * Distribute the independent IRQ over the dependent options
- */
-
res = dev->independent;
if (!res)
return;
@@ -179,33 +187,8 @@
if (!irq || irq->next)
return;
- res = dev->dependent;
- if (!res)
- return;
-
- while (1) {
- struct pnp_irq *copy;
-
- copy = pnp_alloc(sizeof *copy);
- if (!copy)
- break;
-
- bitmap_copy(copy->map.bits, irq->map.bits, PNP_IRQ_NR);
- copy->flags = irq->flags;
-
- copy->next = res->irq; /* Yes, this is NULL */
- res->irq = copy;
-
- if (!res->next)
- break;
- res = res->next;
- }
- kfree(irq);
-
- res->next = quirk_isapnp_mpu_options(dev);
-
- res = dev->independent;
- res->irq = NULL;
+ irq->flags |= IORESOURCE_IRQ_OPTIONAL;
+ dev_info(&dev->dev, "made independent IRQ optional\n");
}
static void quirk_isapnp_mpu_resources(struct pnp_dev *dev)