linux-kernel - [PATCH 18/20] Blackfin SPI Driver: fix NULL pointer crash

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Message-Id: <1233904388-5765-19-git-send-email-cooloney@kernel.org>
Date:	Fri,  6 Feb 2009 15:13:06 +0800
From:	Bryan Wu <cooloney@...nel.org>
To:	dbrownell@...rs.sourceforge.net, akpm@...ux-foundation.org
Cc:	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Mike Frysinger <vapier.adi@...il.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 18/20] Blackfin SPI Driver: fix NULL pointer crash

From: Mike Frysinger <vapier.adi@...il.com>

fix NULL pointer crash when cleaning up from invalid platform resources

Signed-off-by: Mike Frysinger <vapier.adi@...il.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 drivers/spi/spi_bfin5xx.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index f9e1fbc..9459c42 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -1178,6 +1178,9 @@ static void bfin_spi_cleanup(struct spi_device *spi)
 {
 	struct chip_data *chip = spi_get_ctldata(spi);
 
+	if (!chip)
+		return;
+
 	if ((chip->chip_select_num > 0)
 		&& (chip->chip_select_num <= spi->master->num_chipselect))
 		peripheral_free(ssel[spi->master->bus_num]
-- 
1.5.6.3
--
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