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Date: Tue, 1 Mar 2016 10:58:45 -0600
From: Michael Welling <mwelling@ieee.org>
To: gregkh@linuxfoundation.org
Cc: broonie@kernel.org, joe@iachieved.it, stable@vger.kernel.org,
	stable-commits@vger.kernel.org
Subject: Re: Patch "spi: omap2-mcspi: Prevent duplicate gpio_request" has
 been added to the 4.4-stable tree
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On Tue, Mar 01, 2016 at 08:15:27AM +0000, gregkh@linuxfoundation.org wrote:
> 
> This is a note to let you know that I've just added the patch titled
> 
>     spi: omap2-mcspi: Prevent duplicate gpio_request
> 
> to the 4.4-stable tree which can be found at:
>     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>

Thanks Greg.
 
> The filename of the patch is:
>      spi-omap2-mcspi-prevent-duplicate-gpio_request.patch
> and it can be found in the queue-4.4 subdirectory.
> 
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
> 
> 
> From 2f538c017e1a8620d19553931199c6d6a6d31bb2 Mon Sep 17 00:00:00 2001
> From: Michael Welling <mwelling@ieee.org>
> Date: Mon, 30 Nov 2015 09:02:39 -0600
> Subject: spi: omap2-mcspi: Prevent duplicate gpio_request
> 
> From: Michael Welling <mwelling@ieee.org>
> 
> commit 2f538c017e1a8620d19553931199c6d6a6d31bb2 upstream.
> 
> Occasionally the setup function will be called multiple times. Only request
> the gpio the first time otherwise -EBUSY will occur on subsequent calls to
> setup.
> 
> Reported-by: Joseph Bell <joe@iachieved.it>
> 
> Signed-off-by: Michael Welling <mwelling@ieee.org>
> Signed-off-by: Mark Brown <broonie@kernel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> ---
>  drivers/spi/spi-omap2-mcspi.c |   19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> --- a/drivers/spi/spi-omap2-mcspi.c
> +++ b/drivers/spi/spi-omap2-mcspi.c
> @@ -1024,6 +1024,16 @@ static int omap2_mcspi_setup(struct spi_
>  		spi->controller_state = cs;
>  		/* Link this to context save list */
>  		list_add_tail(&cs->node, &ctx->cs);
> +
> +		if (gpio_is_valid(spi->cs_gpio)) {
> +			ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev));
> +			if (ret) {
> +				dev_err(&spi->dev, "failed to request gpio\n");
> +				return ret;
> +			}
> +			gpio_direction_output(spi->cs_gpio,
> +					 !(spi->mode & SPI_CS_HIGH));
> +		}
>  	}
>  
>  	if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) {
> @@ -1032,15 +1042,6 @@ static int omap2_mcspi_setup(struct spi_
>  			return ret;
>  	}
>  
> -	if (gpio_is_valid(spi->cs_gpio)) {
> -		ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev));
> -		if (ret) {
> -			dev_err(&spi->dev, "failed to request gpio\n");
> -			return ret;
> -		}
> -		gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
> -	}
> -
>  	ret = pm_runtime_get_sync(mcspi->dev);
>  	if (ret < 0)
>  		return ret;
> 
> 
> Patches currently in stable-queue which might be from mwelling@ieee.org are
> 
> queue-4.4/spi-omap2-mcspi-prevent-duplicate-gpio_request.patch