From: Lucas Stach <l.stach@pengutronix.de>
To: Robin Gong <yibin.gong@nxp.com>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
"vkoul@kernel.org" <vkoul@kernel.org>,
"dan.j.williams@intel.com" <dan.j.williams@intel.com>
Cc: "dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH v3 0/6] add virt-dma support for imx-sdma
Date: Wed, 13 Jun 2018 18:07:52 +0200 [thread overview]
Message-ID: <1528906072.21021.22.camel@pengutronix.de> (raw)
In-Reply-To: <1528822708.13468.9.camel@nxp.com>
Hi Robin,
Am Dienstag, den 12.06.2018, 08:58 +0000 schrieb Robin Gong:
> Hi Lucas,
> Is the below DEAD LOCK issue same as your side? If yes, then
> I'm afraid that we have to make another patch for uart to split dma
> functions in uart driver out of the code area which protected by
> port.lock. The warning make sense since allocate sdma bd memory
> dynamically in virt-dma instead of static allocated as before. I'll
> make another uart patch into my next version patchset.
Yes, I see the same lockdep splat on my system. Though I'm not sure if
this is really the root cause of the issue I see.
I'm getting timeouts for a serdev attached device and I don't think
this system ever enters memory reclaim, so the issue reported by
lockdep seems to be a mostly theoretical on this system. But lets see
how far I get when you fixed this issue, maybe the real bug is hiding
behind this one.
Regards,
Lucas
next prev parent reply other threads:[~2018-06-13 16:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-11 14:59 [PATCH v3 0/6] add virt-dma support for imx-sdma Robin Gong
2018-06-11 11:01 ` Lucas Stach
2018-06-11 12:09 ` Robin Gong
2018-06-12 8:58 ` Robin Gong
2018-06-13 16:07 ` Lucas Stach [this message]
2018-06-14 3:04 ` Robin Gong
2018-06-11 14:59 ` [PATCH v3 1/6] dmaengine: imx-sdma: factor out a struct sdma_desc from struct sdma_channel Robin Gong
2018-06-11 14:59 ` [PATCH v3 2/6] dmaengine: imx-sdma: add virt-dma support Robin Gong
2018-06-11 14:59 ` [PATCH v3 3/6] Revert "dmaengine: imx-sdma: fix pagefault when channel is disabled during interrupt" Robin Gong
2018-06-11 14:59 ` [PATCH v3 4/6] dmaengine: imx-sdma: remove usless lock Robin Gong
2018-06-13 9:53 ` Sascha Hauer
2018-06-11 14:59 ` [PATCH v3 5/6] dmaengine: imx-sdma: remove the maximum limation for bd numbers Robin Gong
2018-06-13 9:54 ` Sascha Hauer
2018-06-11 14:59 ` [PATCH v3 6/6] dmaengine: imx-sdma: add sdma_transfer_init to decrease code overlap Robin Gong
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