linux-kernel - Re: [PATCH 50/69] Revert "dmaengine: qcom_hidma: Check for driver register failure"

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Date:   Mon, 3 May 2021 08:57:11 -0400
From:   Sinan Kaya <okaya@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Aditya Pakki <pakki001@....edu>, Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH 50/69] Revert "dmaengine: qcom_hidma: Check for driver
 register failure"

On 5/3/2021 7:57 AM, Greg Kroah-Hartman wrote:
> This reverts commit a474b3f0428d6b02a538aa10b3c3b722751cb382.
> 
> Because of recent interactions with developers from @umn.edu, all
> commits from them have been recently re-reviewed to ensure if they were
> correct or not.
> 
> Upon review, this commit was found to be incorrect for the reasons
> below, so it must be reverted.  It will be fixed up "correctly" in a
> later kernel change.
> 
> The original change is NOT correct, as it does not correctly unwind from
> the resources that was allocated before the call to
> platform_driver_register().
> 
> Cc: Aditya Pakki <pakki001@....edu>
> Cc: Sinan Kaya <okaya@...nel.org>
> Cc: Vinod Koul <vkoul@...nel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/dma/qcom/hidma_mgmt.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/qcom/hidma_mgmt.c b/drivers/dma/qcom/hidma_mgmt.c
> index 806ca02c52d7..fe87b01f7a4e 100644
> --- a/drivers/dma/qcom/hidma_mgmt.c
> +++ b/drivers/dma/qcom/hidma_mgmt.c
> @@ -418,8 +418,9 @@ static int __init hidma_mgmt_init(void)
>  		hidma_mgmt_of_populate_channels(child);
>  	}
>  #endif
> -	return platform_driver_register(&hidma_mgmt_driver);
> +	platform_driver_register(&hidma_mgmt_driver);
>  
> +	return 0;
>  }
>  module_init(hidma_mgmt_init);
>  MODULE_LICENSE("GPL v2");
> 

Acked-By: Sinan Kaya <okaya@...nel.org>