4.9-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
[ Upstream commit 4d5e0689dc9d5640ad46cdfbe1896b74d8df1661 ]
Take an extra reference to the controller before deregistering it to prevent use-after-free in the interrupt handler in case an interrupt fires before the line is disabled.
Fixes: b1353d1c1d45 ("spi: Add Analog Devices AXI SPI Engine controller support") Acked-by: Lars-Peter Clausen lars@metafoo.de Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/spi/spi-axi-spi-engine.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/spi/spi-axi-spi-engine.c +++ b/drivers/spi/spi-axi-spi-engine.c @@ -553,7 +553,7 @@ err_put_master:
static int spi_engine_remove(struct platform_device *pdev) { - struct spi_master *master = platform_get_drvdata(pdev); + struct spi_master *master = spi_master_get(platform_get_drvdata(pdev)); struct spi_engine *spi_engine = spi_master_get_devdata(master); int irq = platform_get_irq(pdev, 0);
@@ -561,6 +561,8 @@ static int spi_engine_remove(struct plat
free_irq(irq, master);
+ spi_master_put(master); + writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING); writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE); writel_relaxed(0x01, spi_engine->base + SPI_ENGINE_REG_RESET);