From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thierry Reding Subject: [PATCH 2/9] irqdomain: Introduce __irq_create_mapping() Date: Mon, 16 Sep 2013 10:31:59 +0200 Message-ID: <1379320326-13241-3-git-send-email-treding@nvidia.com> References: <1379320326-13241-1-git-send-email-treding@nvidia.com> Return-path: In-Reply-To: <1379320326-13241-1-git-send-email-treding@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: Greg Kroah-Hartman , Linus Walleij , Stephen Warren , Wolfram Sang , Grant Likely , Rob Herring , Benjamin Herrenschmidt , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-tegra@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org This is a version of irq_create_mapping() that propagates the precise error code instead of returning 0 for all errors. It will be used in subsequent patches to allow further propagation of error codes. To avoid code duplication, implement irq_create_mapping() as a wrapper around the new __irq_create_mapping(). Signed-off-by: Thierry Reding --- kernel/irq/irqdomain.c | 59 +++++++++++++++++++++++++++++++++----------------- 1 file changed, 39 insertions(+), 20 deletions(-) diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 706724e..d2a3b01 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -374,30 +374,21 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) } EXPORT_SYMBOL_GPL(irq_create_direct_mapping); -/** - * irq_create_mapping() - Map a hardware interrupt into linux irq space - * @domain: domain owning this hardware interrupt or NULL for default domain - * @hwirq: hardware irq number in that domain space - * - * Only one mapping per hardware interrupt is permitted. Returns a linux - * irq number. - * If the sense/trigger is to be specified, set_irq_type() should be called - * on the number returned from that call. - */ -unsigned int irq_create_mapping(struct irq_domain *domain, - irq_hw_number_t hwirq) +static int __irq_create_mapping(struct irq_domain *domain, + irq_hw_number_t hwirq, unsigned int *virqp) { - unsigned int hint; - int virq; + unsigned int hint, virq; + int ret; - pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); + pr_debug("__irq_create_mapping(0x%p, 0x%lx, %p)\n", domain, hwirq, + virqp); /* Look for default domain if nececssary */ if (domain == NULL) domain = irq_default_domain; if (domain == NULL) { WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq); - return 0; + return -ENODEV; } pr_debug("-> using domain @%p\n", domain); @@ -405,7 +396,11 @@ unsigned int irq_create_mapping(struct irq_domain *domain, virq = irq_find_mapping(domain, hwirq); if (virq) { pr_debug("-> existing mapping on virq %d\n", virq); - return virq; + + if (virqp) + *virqp = virq; + + return 0; } /* Allocate a virtual interrupt number */ @@ -417,17 +412,41 @@ unsigned int irq_create_mapping(struct irq_domain *domain, virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); if (virq <= 0) { pr_debug("-> virq allocation failed\n"); - return 0; + return virq ? : -ENOSPC; } - if (irq_domain_associate(domain, virq, hwirq)) { + ret = irq_domain_associate(domain, virq, hwirq); + if (ret) { irq_free_desc(virq); - return 0; + return ret; } pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", hwirq, of_node_full_name(domain->of_node), virq); + if (virqp) + *virqp = virq; + + return 0; +} +/** + * irq_create_mapping() - Map a hardware interrupt into linux irq space + * @domain: domain owning this hardware interrupt or NULL for default domain + * @hwirq: hardware irq number in that domain space + * + * Only one mapping per hardware interrupt is permitted. Returns a linux + * irq number. + * If the sense/trigger is to be specified, set_irq_type() should be called + * on the number returned from that call. + */ +unsigned int irq_create_mapping(struct irq_domain *domain, + irq_hw_number_t hwirq) +{ + unsigned int virq; + + if (__irq_create_mapping(domain, hwirq, &virq)) + return 0; + return virq; } EXPORT_SYMBOL_GPL(irq_create_mapping); -- 1.8.4