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authorGrant Likely <grant.likely@linaro.org>2013-06-10 01:06:02 +0100
committerGrant Likely <grant.likely@linaro.org>2013-06-24 14:01:42 +0100
commitddaf144c61da45ae5c49ae38556c3ac4524f9318 (patch)
tree6992bedc5f2a620f7b4e4dadfce76658e7667d35 /arch/x86/kernel/devicetree.c
parent1400ea86025a22862f97e7fe544433751b43ecec (diff)
downloadop-kernel-dev-ddaf144c61da45ae5c49ae38556c3ac4524f9318.zip
op-kernel-dev-ddaf144c61da45ae5c49ae38556c3ac4524f9318.tar.gz
irqdomain: Refactor irq_domain_associate_many()
Originally, irq_domain_associate_many() was designed to unwind the mapped irqs on a failure of any individual association. However, that proved to be a problem with certain IRQ controllers. Some of them only support a subset of irqs, and will fail when attempting to map a reserved IRQ. In those cases we want to map as many IRQs as possible, so instead it is better for irq_domain_associate_many() to make a best-effort attempt to map irqs, but not fail if any or all of them don't succeed. If a caller really cares about how many irqs got associated, then it should instead go back and check that all of the irqs is cares about were mapped. The original design open-coded the individual association code into the body of irq_domain_associate_many(), but with no longer needing to unwind associations, the code becomes simpler to split out irq_domain_associate() to contain the bulk of the logic, and irq_domain_associate_many() to be a simple loop wrapper. This patch also adds a new error check to the associate path to make sure it isn't called for an irq larger than the controller can handle, and adds locking so that the irq_domain_mutex is held while setting up a new association. v3: Fixup missing change to irq_domain_add_tree() v2: Fixup x86 warning. irq_domain_associate_many() no longer returns an error code, but reports errors to the printk log directly. In the majority of cases we don't actually want to fail if there is a problem, but rather log it and still try to boot the system. Signed-off-by: Grant Likely <grant.likely@linaro.org> irqdomain: Fix flubbed irq_domain_associate_many refactoring commit d39046ec72, "irqdomain: Refactor irq_domain_associate_many()" was missing the following hunk which causes a boot failure on anything using irq_domain_add_tree() to allocate an irq domain. Signed-off-by: Grant Likely <grant.likely@linaro.org> Cc: Michael Neuling <mikey@neuling.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Cc: Thomas Gleixner <tglx@linutronix.de>, Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Diffstat (limited to 'arch/x86/kernel/devicetree.c')
-rw-r--r--arch/x86/kernel/devicetree.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index b158152..4934890 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -364,9 +364,7 @@ static void dt_add_ioapic_domain(unsigned int ioapic_num,
* and assigned so we can keep the 1:1 mapping which the ioapic
* is having.
*/
- ret = irq_domain_associate_many(id, 0, 0, NR_IRQS_LEGACY);
- if (ret)
- pr_err("Error mapping legacy IRQs: %d\n", ret);
+ irq_domain_associate_many(id, 0, 0, NR_IRQS_LEGACY);
if (num > NR_IRQS_LEGACY) {
ret = irq_create_strict_mappings(id, NR_IRQS_LEGACY,
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