From: Lukas Wunner lukas@wunner.de
commit e1483ac030fb4c57734289742f1c1d38dca61e22 upstream
bcm2835_spi_remove() accesses the driver's private data after calling spi_unregister_controller() even though that function releases the last reference on the spi_controller and thereby frees the private data.
Fix by switching over to the new devm_spi_alloc_master() helper which keeps the private data accessible until the driver has unbound.
Fixes: f8043872e796 ("spi: add driver for BCM2835") Reported-by: Sascha Hauer s.hauer@pengutronix.de Reported-by: Florian Fainelli f.fainelli@gmail.com Signed-off-by: Lukas Wunner lukas@wunner.de Cc: stable@vger.kernel.org # v3.10+: 123456789abc: spi: Introduce device-managed SPI controller allocation Cc: stable@vger.kernel.org # v3.10+ Cc: Vladimir Oltean olteanv@gmail.com Tested-by: Florian Fainelli f.fainelli@gmail.com Acked-by: Florian Fainelli f.fainelli@gmail.com Link: https://lore.kernel.org/r/ad66e0a0ad96feb848814842ecf5b6a4539ef35c.160512103... Signed-off-by: Mark Brown broonie@kernel.org [sudip: dev_err_probe() not yet available] Signed-off-by: Sudip Mukherjee sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/spi/spi-bcm2835.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-)
--- a/drivers/spi/spi-bcm2835.c +++ b/drivers/spi/spi-bcm2835.c @@ -1264,7 +1264,7 @@ static int bcm2835_spi_probe(struct plat struct bcm2835_spi *bs; int err;
- ctlr = spi_alloc_master(&pdev->dev, ALIGN(sizeof(*bs), + ctlr = devm_spi_alloc_master(&pdev->dev, ALIGN(sizeof(*bs), dma_get_cache_alignment())); if (!ctlr) return -ENOMEM; @@ -1284,23 +1284,19 @@ static int bcm2835_spi_probe(struct plat bs = spi_controller_get_devdata(ctlr);
bs->regs = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(bs->regs)) { - err = PTR_ERR(bs->regs); - goto out_controller_put; - } + if (IS_ERR(bs->regs)) + return PTR_ERR(bs->regs);
bs->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(bs->clk)) { err = PTR_ERR(bs->clk); dev_err(&pdev->dev, "could not get clk: %d\n", err); - goto out_controller_put; + return err; }
bs->irq = platform_get_irq(pdev, 0); - if (bs->irq <= 0) { - err = bs->irq ? bs->irq : -ENODEV; - goto out_controller_put; - } + if (bs->irq <= 0) + return bs->irq ? bs->irq : -ENODEV;
clk_prepare_enable(bs->clk);
@@ -1330,8 +1326,6 @@ static int bcm2835_spi_probe(struct plat
out_clk_disable: clk_disable_unprepare(bs->clk); -out_controller_put: - spi_controller_put(ctlr); return err; }