Messages in this thread | | | From | <> | Subject | Re: Regression: memory corruption on Atmel SAMA5D31 | Date | Mon, 20 Jun 2022 08:43:51 +0000 |
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On 6/20/22 10:04, Thorsten Leemhuis wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > On 18.05.22 09:51, Peter Rosin wrote: >> 2022-05-18 at 08:21, Tudor.Ambarus@microchip.com wrote: >>> On 5/17/22 17:50, Peter Rosin wrote: >>>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe >>>> >>>> 2022-04-11 at 08:21, Tudor.Ambarus@microchip.com wrote: >>>>> There are some concurrency bugs in the at-hdmac (DMA) driver, I'm handling them >>>>> and will come with a resolution. Disabling the DMA showed the bug is no more >>>>> reproducible. >>>> >>>> Any news? >>> >>> I'm now allocated on this, so I started looking around what has to be done. >>> I'm thinking of using virt-dma to manage the channels and the request queues. >>> Will get back to you after I'll have something working. >> >> Sounds good, thanks! > > That was about a month ago. Has any progress been made to get this > regression fixed?
Hi, Thorsten, Peter,
I was mostly out of office last month, and I'll still be offline this week. I made some progress, tried to address the bugs in an incremental way. I now encounter the memory corruption less often, but I still hit it. I made some drafts at [1] if someone is curios. Anyway, I'm modifying the driver to use virt-dma and also I'm trying to move the election of a new transfer in the irq handler instead of in tasklet. I couldn't find a quick non-invasive fix, so still in progress.
Cheers, ta
git@github.com:ambarus/linux-0day.git, branch dma-regression-hdmac-v5.18-rc7-4th-attempt
> > Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) > > P.S.: As the Linux kernel's regression tracker I deal with a lot of > reports and sometimes miss something important when writing mails like > this. If that's the case here, don't hesitate to tell me in a public > reply, it's in everyone's interest to set the public record straight. > > #regzbot poke > >
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