From: Ludovic Desroches <ludovic.desroches@microchip.com>
To: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: dmaengine@vger.kernel.org, Vinod Koul <vkoul@kernel.org>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] dmaengine: at_xdmac: remove BUG_ON macro in tasklet
Date: Tue, 5 Feb 2019 13:30:51 +0100 [thread overview]
Message-ID: <20190205123051.twnr45lawslr5ccr@M43218.corp.atmel.com> (raw)
In-Reply-To: <324b91c71a148a7694d28d9b8b4364095d9b0ebe.1549364323.git.nicolas.ferre@microchip.com>
On Tue, Feb 05, 2019 at 12:03:41PM +0100, Nicolas Ferre wrote:
> Even if this case shouldn't happen when controller is properly programmed,
> it's still better to avoid dumping a kernel Oops for this.
> As the sequence may happen only for debugging purposes, log the error and
> just finish the tasklet call.
>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Thanks
> ---
> drivers/dma/at_xdmac.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
> index fe69dccfa0c0..37a269420435 100644
> --- a/drivers/dma/at_xdmac.c
> +++ b/drivers/dma/at_xdmac.c
> @@ -1606,7 +1606,11 @@ static void at_xdmac_tasklet(unsigned long data)
> struct at_xdmac_desc,
> xfer_node);
> dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
> - BUG_ON(!desc->active_xfer);
> + if (!desc->active_xfer) {
> + dev_err(chan2dev(&atchan->chan), "Xfer not active: exiting");
> + spin_unlock_bh(&atchan->lock);
> + return;
> + }
>
> txd = &desc->tx_dma_desc;
>
> --
> 2.17.1
>
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prev parent reply other threads:[~2019-02-05 12:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-05 11:03 [PATCH 1/3] dmaengine: at_xdmac: remove BUG_ON macro in tasklet Nicolas Ferre
2019-02-05 11:03 ` [PATCH 2/3] dmaengine: at_xdmac: enhance channel errors handling " Nicolas Ferre
2019-02-05 12:33 ` Ludovic Desroches
2019-02-11 11:58 ` Vinod Koul
2019-04-03 10:05 ` Nicolas.Ferre
2019-02-05 11:03 ` [PATCH 3/3] dmaengine: at_xdmac: only monitor overflow errors for peripheral xfer Nicolas Ferre
2019-02-05 12:35 ` Ludovic Desroches
2019-02-05 12:30 ` Ludovic Desroches [this message]
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