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<div style="LINE-HEIGHT: 15pt">> Are you trying to use the mutex during a interrupt handler as you can't you</div>
<div style="LINE-HEIGHT: 15pt">> need something atomic or not able to sleep like a spinlock.</div>
<div style="LINE-HEIGHT: 15pt">> Nick</div>
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<div style="LINE-HEIGHT: 15pt">I use mutex during FIFO burst write or burst read. I don't want other processes to mess up the FIFO access.
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<div style="LINE-HEIGHT: 15pt">spinlock is not for long interval I understand.</div>
<div style="LINE-HEIGHT: 15pt">Chan<br>
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<b>보낸 사람 : </b>"nick" <xerofoify@gmail.com><br>
<b>보낸 날짜 : </b>2015-06-05 21:34:25 ( +09:00 )<br>
<b>받는 사람 : </b>김찬 <ckim@etri.re.kr>, kernelnewbies@kernelnewbies.org <kernelnewbies@kernelnewbies.org><br>
<b>참조 : </b><br>
<b>제목 : </b>Re: I want to sleep while holding a mutex<br>
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On 2015-06-05 08:30 AM, Chan Kim wrote:<br>
> Hello,<br>
> I need to write to and read from a Ethernet chip's FIFO and for that I want to use DMA controller. So I modified an existing driver and made the process to sleep using wait_event_interruptible after triggering DMA transfer and made it woken up by ISR using
wake_up_interruptible. My problem is that the original driver was using spinlock to protect the FIFO access. But as all know, while holding spinlock, I should not sleep. So I tried replacing spinlock with mutex. (Because, I might sleep while acquiring the
mutex, and after getting the mutex, I'll sleep again after DMA trigger. I get woken up by the ISR, and I'll release the mutex. No problem! I thought. ) But I still get this 'scheduling while atomic BUG'. The question is : I need to go to sleep until DMA completion
while holding a lock (for FIFO read and write). Isn't it ok to sleep while holding a mutex?<br>
> Best regards,<br>
> Chan Kim<br>
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Are you trying to use the mutex during a interrupt handler as you can't you need something<br>
atomic or not able to sleep like a spinlock.<br>
Nick<br>
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