linux-kernel - [PATCH] irqchip/mips-gic: Remove population of irq domain names

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Message-ID: <1500363561-32213-1-git-send-email-matt.redfearn@imgtec.com>
Date:   Tue, 18 Jul 2017 08:39:21 +0100
From:   Matt Redfearn <matt.redfearn@...tec.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>
CC:     <linux-mips@...ux-mips.org>,
        Matt Redfearn <matt.redfearn@...tec.com>,
        Jason Cooper <jason@...edaemon.net>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] irqchip/mips-gic: Remove population of irq domain names

Since commit d59f6617eef0f ("genirq: Allow fwnode to carry name
information only") the irqdomain core sets the names of irq domains.
When the name is allocated the new IRQ_DOMAIN_NAME_ALLOCATED flag is
set. Replacing the allocated name with a constant one is not a good
idea, since calling the new irq_domain_update_bus_token() API, added to
the MIPS GIC driver by commit 96f0d93a487e1 ("irqchip/MSI: Use
irq_domain_update_bus_token instead of an open coded access") will
attempt to kfree the pointer, and result in a kernel OOPS.

Fix this by removing the names, now that they are set by the irqdomain
core. This effectively reverts commit 21c57fd13589 ("irqchip/mips-gic:
Populate irq_domain names").

Fixes: d59f6617eef0f ("genirq: Allow fwnode to carry name information only")
Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com>

---

 drivers/irqchip/irq-mips-gic.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 832ebf4062f7..6ab1d3afec02 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -950,7 +950,6 @@ static void __init __gic_init(unsigned long gic_base_addr,
 					       &gic_irq_domain_ops, NULL);
 	if (!gic_irq_domain)
 		panic("Failed to add GIC IRQ domain");
-	gic_irq_domain->name = "mips-gic-irq";

 	gic_ipi_domain = irq_domain_add_hierarchy(gic_irq_domain,
 						  IRQ_DOMAIN_FLAG_IPI_PER_CPU,
@@ -959,7 +958,6 @@ static void __init __gic_init(unsigned long gic_base_addr,
 	if (!gic_ipi_domain)
 		panic("Failed to add GIC IPI domain");

-	gic_ipi_domain->name = "mips-gic-ipi";
 	irq_domain_update_bus_token(gic_ipi_domain, DOMAIN_BUS_IPI);

 	if (node &&
-- 
2.7.4