linux-kernel - Re: [PATCH V2 2/3] dmaengine: dw_dmac: Enhance device tree support

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Message-ID: <CAKohpo=20mwje+9AVgs7b-_DshyRO2DZ=Nacjm7vFAhed=Wkqg@mail.gmail.com>
Date:	Mon, 15 Oct 2012 08:59:17 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	vinod.koul@...el.com, linux-kernel@...r.kernel.org,
	spear-devel@...t.st.com, linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH V2 2/3] dmaengine: dw_dmac: Enhance device tree support

On 12 October 2012 20:28, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>> +     if (last_dw) {
>> +             if ((last_bus_id == param) && (last_dw == dw))
>> +                     return false;
>> +     }
> Just came to my mind.
> dw can't be NULL, can't it?
> Then
> if (last_dw) {
> ...
> }
> is unneeded.

Fixup for this:

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index d72c26f..764c159 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1196,11 +1196,8 @@ bool dw_dma_generic_filter(struct dma_chan
*chan, void *param)
         * failure. If dw and param are same, i.e. trying on same dw with
         * different channel, return false.
         */
-       if (last_dw) {
-               if ((last_bus_id == param) && (last_dw == dw))
-                       return false;
-       }
-
+       if ((last_dw == dw) && (last_bus_id == param))
+               return false;
        /*
         * Return true:
         * - If dw_dma's platform data is not filled with slave info, then all
--
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