linux-kernel - Re: [PATCH 0/2] serial: samsung: fix DMA for small FIFO sizes

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Message-ID: <CAJKOXPfwnYVyJCPPyG5L0B2kw9nG1KNgj7L6Sy2hJEbihf-b2Q@mail.gmail.com>
Date:	Fri, 31 Jul 2015 17:04:58 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Robert Baldyga <r.baldyga@...sung.com>
Cc:	gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
	jslaby@...e.cz, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH 0/2] serial: samsung: fix DMA for small FIFO sizes

2015-07-30 18:14 GMT+09:00 Robert Baldyga <r.baldyga@...sung.com>:
> Hello,
>
> This patch set fixes bug causing serial hang in DMA mode for FIFO sizes
> smaller than cache alignment. The first patch fixes DMA mode entering
> condition to avoid starting with buffer smaller than cache line size.
> Second patch fixes the serial hang bug, which was caused by unproper
> buffer aligning algorithm which assumed that there is always enough
> free space in FIFO for excessive bytes of buffer that is being alligned.
>
> Best regards,
> Robert Baldyga
>
> Marek Szyprowski (1):
>   serial: samsung: calculate min_dma_size
>
> Robert Baldyga (1):
>   serial: samsung: fix DMA for FIFO smaller than cache line size
>
>  drivers/tty/serial/samsung.c | 47 +++++++++++++++++++++++++++++---------------
>  drivers/tty/serial/samsung.h |  1 +
>  2 files changed, 32 insertions(+), 16 deletions(-)

Does this apply for stable backporting? Or at least fixes tag
indicating a bug? I could not figure this out from description of
first patch. For second patch it seems it applies.

Anyway I would appreciate a reported-by credits.

Best regards,
Krzysztof
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