linux-kernel - [PATCH 4.4 077/342] spi: omap2-mcspi: Prevent duplicate gpio

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Date:	Tue, 01 Mar 2016 23:54:09 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>, Joseph Bell <joe@...hieved.it>,
	Michael Welling <mwelling@...e.org>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.4 077/342] spi: omap2-mcspi: Prevent duplicate gpio_request

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Welling <mwelling@...e.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@...hieved.it>

Signed-off-by: Michael Welling <mwelling@...e.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;