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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The reason I received “</span><span style="font-size:10.0pt;font-family:굴림">IRQ 2 device ald_dmac returned IRQ_WAKE_THREAD but no thread function available”
was that in the interrupt handler, I didn’t return IRQ_HANDLED properly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:굴림">I guess if I don’t return IRQ_HANDLED, the basic handler interprets it as having returned IRQ_WAKE_THREAD and tries to run the thread given by the thread_fn argument of the request_threaded_irq
function. (which is NULL in my case).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:굴림">So when I made the interrupt handler return IRQ_HANDLED, that message is gone.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:굴림">Chan Kim<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> kernelnewbies-bounces+ckim=etri.re.kr@kernelnewbies.org [mailto:kernelnewbies-bounces+ckim=etri.re.kr@kernelnewbies.org]
<b>On Behalf Of </b>Cha<br>
<b>Sent:</b> Monday, May 18, 2015 6:46 PM<br>
<b>To:</b> kernelnewbies@kernelnewbies.org<br>
<b>Subject:</b> device returned IRQ_WAKE_THREAD but no thread function avable error<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림"><br>
In the smsc911x Ethernet chip driver, I'm changing the FIFO write and read to DMA write and read.<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">By the way, this driver uses loopback test during initialization using a simple test packet.<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">I registered the DMA controller irq using request_irq(irq, handler, flags, name, dev) which calls request_threaded_irq(irq, handler, NULL, flags, name, dev).
<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">The process goes into sleep using wait_event_interruptible() after DMA command and I've seen the ISR handler is called by the DMA completion, and during the ISR, wake_up_interruptible()
is called to wake up the process.<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">But when the program runs I get this error message below during the first interrupt processing.
<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">"IRQ 2 device ald_dmac returned IRQ_WAKE_THREAD but no thread function available"<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">I don't know why ald_dmac returned IRQ_WAKE_THREAD (because my interrupt handler only returns IRQ_HANDLED), and I have a feeling that in this case (processing going
to sleep and woken up by the ISR), I should use some other method to register my interrupt.<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">Can anybody give me some advice?<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">Thanks a lot in advance.<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림">Chan Kim<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:15.0pt"><span style="font-size:10.0pt;font-family:굴림"><o:p> </o:p></span></p>
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