You can do down_interruptible to make the down interruptible.
Bhuvan Kumar MITTAL wrote:
I'll rephrase the problem as follow:
I have a userthread which makes ioctl calls to the kernel and once it reaches inside the kernel it waits on a semaphore. It then does some work inside the kernel and con
I'll rephrase the problem as follow:
I have a userthread which makes ioctl calls to the kernel and once it reaches
inside the kernel it waits on a semaphore. It then does some work inside the
kernel and continuously keeps looping between the kernel and user space in an
endless while loop.
I w
Bhuvan Kumar MITTAL wrote:
Hi Alan,Nick
Thanks for your inputs. I was able to solve the problem of mapping kernel
buffer to user space. Just FYI, I am working on a sh4 based architecture
proprietary board with Linux kernel 2.6.17.3
So... you used flush_dcache_page? Or what?
Initially I was
27;Alan Cox'; linux-kernel@vger.kernel.org
Subject: Re: How to make mmap'ed kernel buffer non-cacheable
Bhuvan Kumar MITTAL wrote:
> Hi Alan,
>
> I believe that dma_alloc_coherent will mark the kernel buffer as uncached at
> alocation time.
> But that is not my intent
Bhuvan Kumar MITTAL wrote:
Hi Alan,
I believe that dma_alloc_coherent will mark the kernel buffer as uncached at alocation time.
But that is not my intention. I have mapped some user space memory to the kernel buffer and I wish to ensure that the contents of both are coherent and correctly orde
Hi Alan,
I believe that dma_alloc_coherent will mark the kernel buffer as uncached at
alocation time.
But that is not my intention. I have mapped some user space memory to the
kernel buffer and I wish to ensure that the contents of both are coherent and
correctly ordered.
In other words I wi
On Fri, 20 Apr 2007 18:30:25 +0530
Bhuvan Kumar MITTAL <[EMAIL PROTECTED]> wrote:
> Hi,
> I am working on an audio device driver development on Linux. I have a
> kernel buffer which I have mapped to user space using mmap call from user
> space. My problem is that the data which comes to the ke
On 20 Apr, 14:20, Bhuvan Kumar MITTAL <[EMAIL PROTECTED]> wrote:
Hi,
I am working on an audio device driver development on Linux. I have a kernel
buffer which I have mapped to user space using mmap call from user space. My
problem is that the data which comes to the kernel buffer is getting dro
Hi,
I am working on an audio device driver development on Linux. I have a kernel
buffer which I have mapped to user space using mmap call from user space. My
problem is that the data which comes to the kernel buffer is getting dropped in
user space and I get only 50-60% of the data which is ra
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