linux-kernel - [PATCH 4.4 28/51] spi: spi-fsl-dspi: Drop extra spi_master

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Message-Id: <20161029134923.672180491@linuxfoundation.org>
Date:   Sat, 29 Oct 2016 09:49:29 -0400
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wei Yongjun <weiyj.lk@...il.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.4 28/51] spi: spi-fsl-dspi: Drop extra spi_master_put in device remove function

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

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

From: Wei Yongjun <weiyj.lk@...il.com>

commit 6999aeabbb703a81a204cb6f9f8f151759a99ac4 upstream.

The call sequence spi_alloc_master/spi_register_master/spi_unregister_master
is complete; it reduces the device reference count to zero, which and results
in device memory being freed. The subsequent call to spi_master_put is
unnecessary and results in an access to free memory. Drop it.

Fixes: 9298bc727385 ("spi: spi-fsl-dspi: Remove spi-bitbang")
Signed-off-by: Wei Yongjun <weiyj.lk@...il.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-fsl-dspi.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -753,7 +753,6 @@ static int dspi_remove(struct platform_d
 	/* Disconnect from the SPI framework */
 	clk_disable_unprepare(dspi->clk);
 	spi_unregister_master(dspi->master);
-	spi_master_put(dspi->master);
 
 	return 0;
 }