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authorLinus Torvalds <torvalds@linux-foundation.org>2011-08-23 10:36:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-08-23 10:36:51 -0700
commit69dd3d8e29e294caaf63eb5e8a72d250279f9e5f (patch)
tree51e4d037b96431f2686ebbcd4e54775eb40b4b85 /kernel
parentfcb8ce5cfe30ca9ca5c9a79cdfe26d1993e65e0c (diff)
Revert "irq: Always set IRQF_ONESHOT if no primary handler is specified"
This reverts commit f3637a5f2e2eb391ff5757bc83fb5de8f9726464. It turns out that this breaks several drivers, one example being OMAP boards which use the on-board OMAP UARTs and the omap-serial driver that will not boot to userspace after the commit. Paul Walmsley reports that enabling CONFIG_DEBUG_SHIRQ reveals 'IRQ handler type mismatch' errors: IRQ handler type mismatch for IRQ 74 current handler: serial idle ... and the reason is that setting IRQF_ONESHOT will now result in those interrupt handlers having different IRQF flags, and thus being unsharable. So the commit log in the reverted commit: "Since it is required for those users and there is no difference for others it makes sense to add this flag unconditionally." is simply not true: there may not be any difference from a "actions at irq time", but there is a *big* difference wrt this flag testing irq management (see __setup_irq() in kernel/irq/manage.c). One solution may be to stop verifying IRQF_ONESHOT in __setup_irq(), but right now the safe course of action is to revert the change. Let's revisit this in a later merge window. Reported-by: Paul Walmsley <paul@pwsan.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Requested-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/manage.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 2e9425889fa..9b956fa2030 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1331,7 +1331,6 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
if (!thread_fn)
return -EINVAL;
handler = irq_default_primary_handler;
- irqflags |= IRQF_ONESHOT;
}
action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);