On 25 October 2012 15:26, Hongbo Zhang hongbo.zhang@linaro.org wrote:
Verish, see the codes in include/linux/interrupt.h:
s/verish/viresh :)
static inline int __must_check devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, unsigned long irqflags, const char *devname, void *dev_id) { return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, devname, dev_id); } devm_request_irq is devm_request_threaded_irq
See carefully what's happening here.
All interrupt types have a common irq_desc type in kernel. This has few pointers for every interrupt line: - List of handlers to call from interrupt context - handlers to call from process context via a thread.
So, the internal implementation is exactly same... The only difference is which pointer should be called in.
the devm_request_threaded_irq() called from devm_request_irq() has following params handler: For irq to be called from interrupt context (param 3) NULL: For irq to be called from process context. (param 4)
So, that means normal request_irq type only.
In your case, you have passed interrupt context pointer as NULL and process context one as handler. So that's an issue.
-- viresh