From: sashiko-bot@kernel.org
To: "James Hilliard" <james.hilliard1@gmail.com>
Cc: linux-serial@vger.kernel.org
Subject: Re: [PATCH] serial: 8250: calculate TX length before preparing DMA flow control
Date: Thu, 22 Oct 2026 17:18:15 +0000 [thread overview]
Message-ID: <sashiko-outbox-181854@kernel.org> (raw)
In-Reply-To: <20261022-submit-serial-8250-dma-tx-length-v1-v1-1-18cecc89a099@gmail.com>
> The Renesas RZ/N1 preparation hook programs the UART DMA block size from
> dma->tx_size. The generic TX path calls that hook before calculating the
> length of the new transfer, so it programs zero on the first transfer and
> the previous length on subsequent transfers.
>
> Calculate the scatterlist length before calling the preparation hook so
> the UART flow controller and DMA descriptor use the same transfer size.
>
> Fixes: aa63d786cea2 ("serial: 8250: dw: Add support for DMA flow controlling devices")
> Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261022-submit-serial-8250-dma-tx-length-v1-v1-1-18cecc89a099@gmail.com?part=1
next prev parent reply other threads:[~2026-10-22 17:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-22 17:14 [PATCH] serial: 8250: calculate TX length before preparing DMA flow control James Hilliard
2026-10-22 17:18 ` sashiko-bot [this message]
2026-10-23 7:42 ` Miquel Raynal
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