linux-kernel - Re: [PATCH] dmaengine: dmatest: fix container_of member in dmatest

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Message-ID: <20180129044547.GK18649@localhost>
Date:   Mon, 29 Jan 2018 10:15:48 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Yang Shunyong <shunyong.yang@...-semitech.com>
Cc:     dan.j.williams@...el.com, awallis@...eaurora.org,
        yu.zheng@...-semitech.com, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: dmatest: fix container_of member in
 dmatest_callback

On Mon, Jan 22, 2018 at 03:28:28PM +0800, Yang Shunyong wrote:
> The type of arg passed to dmatest_callback is struct dmatest_done.
> It refers to test_done in struct dmatest_thread, not done_wait.
> 
> Fixes: 6f6a23a213be ("dmaengine: dmatest: move callback wait ...")
> Signed-off-by: Yang Shunyong <shunyong.yang@...-semitech.com>
> ---
>  drivers/dma/dmatest.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
> index ec5f9d2bc820..906e85d6dedc 100644
> --- a/drivers/dma/dmatest.c
> +++ b/drivers/dma/dmatest.c
> @@ -355,7 +355,7 @@ static void dmatest_callback(void *arg)
>  {
>  	struct dmatest_done *done = arg;
>  	struct dmatest_thread *thread =
> -		container_of(arg, struct dmatest_thread, done_wait);
> +		container_of(arg, struct dmatest_thread, test_done);

This fixes it but one of the reason why compilers didn't catch this
was the void arg. I just tested and used 'done' as the argument here
rather than 'arg' and compiler was quick to point out the error.

So a better fix IMO would be:

-- >8 --

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index ec5f9d2bc820..80cc2be6483c 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -355,7 +355,7 @@ static void dmatest_callback(void *arg)
 {
        struct dmatest_done *done = arg;
        struct dmatest_thread *thread =
-               container_of(arg, struct dmatest_thread, done_wait);
+               container_of(done, struct dmatest_thread, test_done);
        if (!thread->done) {
                done->done = true;
                wake_up_all(done->wait);

-- 
~Vinod