From: Larry Finger <Larry.Finger@lwfinger.net>
To: "Rafał Miłecki" <zajec5@gmail.com>
Cc: John W Linville <linville@tuxdriver.com>,
Michael Buesch <mb@bu3sch.de>,
b43-dev@lists.infradead.org, linux-wireless@vger.kernel.org
Subject: [RFC/RFT] b43: Relax requirement for descriptors to be in the DMA zone
Date: Thu, 25 Aug 2011 12:29:50 -0500 [thread overview]
Message-ID: <4E56868E.7010404@lwfinger.net> (raw)
In-Reply-To: <CACna6ryVB3yTj7rQbSdCqrw-9WtaPZedM7Ug6JV0iTDQQOv=Sw@mail.gmail.com>
On 08/25/2011 12:24 PM, Rafa? Mi?ecki wrote:
> 2011/8/25 Larry Finger<Larry.Finger@lwfinger.net>:
>> When 64-bit DMA was first used, there were problems with the
>> BCM4311 (14e4:4311). The problem was "fixed" by using the GFP_DMA
>> flag in the allocation of coherent ring descriptor memory.
>>
>> The original problem is now believed to have been due to bugs in
>> the 64-bit DMA implementation in the rest of the kernel, and that
>> those bugs have been fixed. Accordingly, the requirement for the
>> descriptors to be in the DMA zone is relaxed.
>
> Larry, it is not clear to me from the commit message: did you test
> that patch with your 14e4:4311?
Yes.
Larry
WARNING: multiple messages have this Message-ID (diff)
From: Larry Finger <Larry.Finger@lwfinger.net>
To: "Rafał Miłecki" <zajec5@gmail.com>
Cc: John W Linville <linville@tuxdriver.com>,
Michael Buesch <mb@bu3sch.de>,
b43-dev@lists.infradead.org, linux-wireless@vger.kernel.org
Subject: Re: [RFC/RFT] b43: Relax requirement for descriptors to be in the DMA zone
Date: Thu, 25 Aug 2011 12:29:50 -0500 [thread overview]
Message-ID: <4E56868E.7010404@lwfinger.net> (raw)
In-Reply-To: <CACna6ryVB3yTj7rQbSdCqrw-9WtaPZedM7Ug6JV0iTDQQOv=Sw@mail.gmail.com>
On 08/25/2011 12:24 PM, Rafał Miłecki wrote:
> 2011/8/25 Larry Finger<Larry.Finger@lwfinger.net>:
>> When 64-bit DMA was first used, there were problems with the
>> BCM4311 (14e4:4311). The problem was "fixed" by using the GFP_DMA
>> flag in the allocation of coherent ring descriptor memory.
>>
>> The original problem is now believed to have been due to bugs in
>> the 64-bit DMA implementation in the rest of the kernel, and that
>> those bugs have been fixed. Accordingly, the requirement for the
>> descriptors to be in the DMA zone is relaxed.
>
> Larry, it is not clear to me from the commit message: did you test
> that patch with your 14e4:4311?
Yes.
Larry
next prev parent reply other threads:[~2011-08-25 17:29 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-24 22:02 [RFC/RFT] b43: Relax requirement for descriptors to be in the DMA zone Larry Finger
2011-08-24 22:17 ` Michael Büsch
2011-08-24 22:17 ` Michael Büsch
2011-08-25 17:24 ` Rafał Miłecki
2011-08-25 17:24 ` Rafał Miłecki
2011-08-25 17:29 ` Larry Finger [this message]
2011-08-25 17:29 ` Larry Finger
2011-08-25 18:08 ` Rafał Miłecki
2011-08-25 18:08 ` Rafał Miłecki
-- strict thread matches above, loose matches on Subject: below --
2011-08-24 19:40 Larry Finger
2011-08-24 19:53 ` Michael Büsch
2011-08-24 19:53 ` Michael Büsch
2011-08-24 20:59 ` Rafał Miłecki
2011-08-24 20:59 ` Rafał Miłecki
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