From: Lukas Wunner lukas@wunner.de
commit c7b884561cb5b641f3dbba950094110794119a6d upstream.
atmel_qspi_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: 2d30ac5ed633 ("mtd: spi-nor: atmel-quadspi: Use spi-mem interface for atmel-quadspi driver") Signed-off-by: Lukas Wunner lukas@wunner.de Cc: stable@vger.kernel.org # v5.0+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation Cc: stable@vger.kernel.org # v5.0+ Cc: Piotr Bugalski bugalski.piotr@gmail.com Link: https://lore.kernel.org/r/4b05c65cf6f1ea3251484fe9a00b4c65478a1ae3.160728688... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/spi/atmel-quadspi.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-)
--- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -535,7 +535,7 @@ static int atmel_qspi_probe(struct platf struct resource *res; int irq, err = 0;
- ctrl = spi_alloc_master(&pdev->dev, sizeof(*aq)); + ctrl = devm_spi_alloc_master(&pdev->dev, sizeof(*aq)); if (!ctrl) return -ENOMEM;
@@ -557,8 +557,7 @@ static int atmel_qspi_probe(struct platf aq->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(aq->regs)) { dev_err(&pdev->dev, "missing registers\n"); - err = PTR_ERR(aq->regs); - goto exit; + return PTR_ERR(aq->regs); }
/* Map the AHB memory */ @@ -566,8 +565,7 @@ static int atmel_qspi_probe(struct platf aq->mem = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(aq->mem)) { dev_err(&pdev->dev, "missing AHB memory\n"); - err = PTR_ERR(aq->mem); - goto exit; + return PTR_ERR(aq->mem); }
aq->mmap_size = resource_size(res); @@ -579,15 +577,14 @@ static int atmel_qspi_probe(struct platf
if (IS_ERR(aq->pclk)) { dev_err(&pdev->dev, "missing peripheral clock\n"); - err = PTR_ERR(aq->pclk); - goto exit; + return PTR_ERR(aq->pclk); }
/* Enable the peripheral clock */ err = clk_prepare_enable(aq->pclk); if (err) { dev_err(&pdev->dev, "failed to enable the peripheral clock\n"); - goto exit; + return err; }
aq->caps = of_device_get_match_data(&pdev->dev); @@ -638,8 +635,6 @@ disable_qspick: clk_disable_unprepare(aq->qspick); disable_pclk: clk_disable_unprepare(aq->pclk); -exit: - spi_controller_put(ctrl);
return err; }