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authorThomas Gleixner <tglx@linutronix.de>2015-06-21 21:00:43 +0200
committerThomas Gleixner <tglx@linutronix.de>2015-06-25 11:58:01 +0200
commit5c1642e4d2e475bbfb13da15c6ca16a23ba889bb (patch)
treef0d146b47857c6da121efc1a123c9b15a1ecfffd /arch/mips/ralink/irq.c
parent746ad9a7a1fef789a9f579441b4a7b686fa85aa2 (diff)
MIPS/ralink: Fix race in installing chained IRQ handler
Fix a race where a pending interrupt could be received and the handler called before the handler's data has been setup, by converting to irq_set_chained_handler_and_data(). Search and conversion was done with coccinelle: @@ expression E1, E2, E3; @@ ( -if (irq_set_chained_handler(E1, E3) != 0) - BUG(); | -irq_set_chained_handler(E1, E3); ) -irq_set_handler_data(E1, E2); +irq_set_chained_handler_and_data(E1, E3, E2); @@ expression E1, E2, E3; @@ ( -if (irq_set_chained_handler(E1, E3) != 0) - BUG(); ... | -irq_set_chained_handler(E1, E3); ... ) -irq_set_handler_data(E1, E2); +irq_set_chained_handler_and_data(E1, E3, E2); Reported-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Julia Lawall <Julia.Lawall@lip6.fr> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Qais Yousef <qais.yousef@imgtec.com> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: John Crispin <blogic@openwrt.org> Cc: linux-mips@linux-mips.org
Diffstat (limited to 'arch/mips/ralink/irq.c')
-rw-r--r--arch/mips/ralink/irq.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/mips/ralink/irq.c b/arch/mips/ralink/irq.c
index 7cf91b92e9d1..f0442990aa35 100644
--- a/arch/mips/ralink/irq.c
+++ b/arch/mips/ralink/irq.c
@@ -184,8 +184,7 @@ static int __init intc_of_init(struct device_node *node,
rt_intc_w32(INTC_INT_GLOBAL, INTC_REG_ENABLE);
- irq_set_chained_handler(irq, ralink_intc_irq_handler);
- irq_set_handler_data(irq, domain);
+ irq_set_chained_handler_and_data(irq, ralink_intc_irq_handler, domain);
/* tell the kernel which irq is used for performance monitoring */
rt_perfcount_irq = irq_create_mapping(domain, 9);