From: "Pavel Machek" <pavel@ucw.cz>
To: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc: cip-dev@lists.cip-project.org,
Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>,
Pavel Machek <pavel@denx.de>,
Biju Das <biju.das.jz@bp.renesas.com>
Subject: Re: [cip-dev] [PATCH 4.4.y-cip 2/4] serial: sh-sci: Terminate TX DMA during buffer flushing
Date: Thu, 3 Sep 2020 22:46:45 +0200 [thread overview]
Message-ID: <20200903204645.GB24361@duo.ucw.cz> (raw)
In-Reply-To: <20200903142719.13010-3-prabhakar.mahadev-lad.rj@bp.renesas.com>
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Hi!
> From: Geert Uytterhoeven <geert+renesas@glider.be>
>
> commit 775b7ffd7d6d5db320d99b0a485c51e04dfcf9f1 upstream.
>
> While the .flush_buffer() callback clears sci_port.tx_dma_len since
> commit 1cf4a7efdc71cab8 ("serial: sh-sci: Fix race condition causing
> garbage during shutdown"), it does not terminate a transmit DMA
> operation that may be in progress.
>
> Fix this by terminating any pending DMA operations, and resetting the
> corresponding cookie.
What is the impact of the bug? DMA running during reboot, but not
doing any harm?
Anyway, this looks okay to me.
Best regards,
Pavel
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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next prev parent reply other threads:[~2020-09-03 20:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 14:27 [cip-dev] [PATCH 4.4.y-cip 0/4] serial mctrl_gpio/sh-sci Fixes Lad Prabhakar
2020-09-03 14:27 ` [cip-dev] [PATCH 4.4.y-cip 1/4] serial: mctrl_gpio: Check if GPIO property exisits before requesting it Lad Prabhakar
2020-09-03 20:43 ` Pavel Machek
2020-09-03 14:27 ` [cip-dev] [PATCH 4.4.y-cip 2/4] serial: sh-sci: Terminate TX DMA during buffer flushing Lad Prabhakar
2020-09-03 20:46 ` Pavel Machek [this message]
2020-09-03 14:27 ` [cip-dev] [PATCH 4.4.y-cip 3/4] serial: sh-sci: Don't check for mctrl_gpio_init() returning -ENOSYS Lad Prabhakar
2020-09-03 20:51 ` Pavel Machek
2020-09-03 14:27 ` [cip-dev] [PATCH 4.4.y-cip 4/4] serial: sh-sci: Don't check for mctrl_gpio_to_gpiod() returning error Lad Prabhakar
2020-09-03 20:54 ` Pavel Machek
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