linux-kernel - Re: [PATCH] fix idiocy in asd_init_lseq

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Message-ID: <4517EBF7.4020508@torque.net>
Date:	Mon, 25 Sep 2006 10:47:19 -0400
From:	Douglas Gilbert <dougg@...que.net>
To:	Al Viro <viro@....linux.org.uk>
CC:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix idiocy in asd_init_lseq_mdp()

Al Viro wrote:
> To whoever had written that code:
> 
> a) priority of >> is higher than that of &
> b) priority of typecast is higher than that of any binary operator
> c) learn the fscking C

Al,
On the assumption that you have hardware that uses this
driver, did you notice any improvement with your patch
applied?

Several of us have reported a degenerate mode, that
I term as "tmf timeout", in which a aic94xx based card
becomes inoperable. Alas, the same hardware running another
OS does not exhibit that problem (or at least not as much).

> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> ---
>  drivers/scsi/aic94xx/aic94xx_seq.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/scsi/aic94xx/aic94xx_seq.c b/drivers/scsi/aic94xx/aic94xx_seq.c
> index d9b6da5..56e4b3b 100644
> --- a/drivers/scsi/aic94xx/aic94xx_seq.c
> +++ b/drivers/scsi/aic94xx/aic94xx_seq.c
> @@ -764,7 +764,7 @@ static void asd_init_lseq_mdp(struct asd
>  	asd_write_reg_word(asd_ha, LmSEQ_FIRST_INV_SCB_SITE(lseq),
>  			   (u16)last_scb_site_no+1);
>  	asd_write_reg_word(asd_ha, LmSEQ_INTEN_SAVE(lseq),
> -			    (u16) LmM0INTEN_MASK & 0xFFFF0000 >> 16);
> +			    (u16) ((LmM0INTEN_MASK & 0xFFFF0000) >> 16));
>  	asd_write_reg_word(asd_ha, LmSEQ_INTEN_SAVE(lseq) + 2,
>  			    (u16) LmM0INTEN_MASK & 0xFFFF);
>  	asd_write_reg_byte(asd_ha, LmSEQ_LINK_RST_FRM_LEN(lseq), 0);

BTW Luben was pointing out that the call you patched
and the following call can be combined into a less
trouble prone asd_write_reg_dword() call.

Doug Gilbert

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