From: Patrice Chotard <patrice.chotard@xxxxxxxxxxx> commit e4d63473d3110afd170e6e0e48494d3789d26136 upstream. Some device driver need to communicate to qspi device during the remove process, qspi controller must be functional when spi_unregister_master() is called. To ensure this, replace devm_spi_register_master() by spi_register_master() and spi_unregister_master() is called directly in .remove callback before stopping the qspi controller. This issue was put in evidence using kernel v5.11 and later with a spi-nor which supports the software reset feature introduced by commit d73ee7534cc5 ("mtd: spi-nor: core: perform a Soft Reset on shutdown") Fixes: c530cd1d9d5e ("spi: spi-mem: add stm32 qspi controller") Signed-off-by: Patrice Chotard <patrice.chotard@xxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # 5.8.x Reviewed-by: Lukas Wunner <lukas@xxxxxxxxx> Link: https://lore.kernel.org/r/20220117121744.29729-1-patrice.chotard@xxxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/spi/spi-stm32-qspi.c | 47 +++++++++++++++---------------------------- 1 file changed, 17 insertions(+), 30 deletions(-) --- a/drivers/spi/spi-stm32-qspi.c +++ b/drivers/spi/spi-stm32-qspi.c @@ -688,7 +688,7 @@ static int stm32_qspi_probe(struct platf struct resource *res; int ret, irq; - ctrl = spi_alloc_master(dev, sizeof(*qspi)); + ctrl = devm_spi_alloc_master(dev, sizeof(*qspi)); if (!ctrl) return -ENOMEM; @@ -697,58 +697,46 @@ static int stm32_qspi_probe(struct platf res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi"); qspi->io_base = devm_ioremap_resource(dev, res); - if (IS_ERR(qspi->io_base)) { - ret = PTR_ERR(qspi->io_base); - goto err_master_put; - } + if (IS_ERR(qspi->io_base)) + return PTR_ERR(qspi->io_base); qspi->phys_base = res->start; res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_mm"); qspi->mm_base = devm_ioremap_resource(dev, res); - if (IS_ERR(qspi->mm_base)) { - ret = PTR_ERR(qspi->mm_base); - goto err_master_put; - } + if (IS_ERR(qspi->mm_base)) + return PTR_ERR(qspi->mm_base); qspi->mm_size = resource_size(res); - if (qspi->mm_size > STM32_QSPI_MAX_MMAP_SZ) { - ret = -EINVAL; - goto err_master_put; - } + if (qspi->mm_size > STM32_QSPI_MAX_MMAP_SZ) + return -EINVAL; irq = platform_get_irq(pdev, 0); - if (irq < 0) { - ret = irq; - goto err_master_put; - } + if (irq < 0) + return irq; ret = devm_request_irq(dev, irq, stm32_qspi_irq, 0, dev_name(dev), qspi); if (ret) { dev_err(dev, "failed to request irq\n"); - goto err_master_put; + return ret; } init_completion(&qspi->data_completion); init_completion(&qspi->match_completion); qspi->clk = devm_clk_get(dev, NULL); - if (IS_ERR(qspi->clk)) { - ret = PTR_ERR(qspi->clk); - goto err_master_put; - } + if (IS_ERR(qspi->clk)) + return PTR_ERR(qspi->clk); qspi->clk_rate = clk_get_rate(qspi->clk); - if (!qspi->clk_rate) { - ret = -EINVAL; - goto err_master_put; - } + if (!qspi->clk_rate) + return -EINVAL; ret = clk_prepare_enable(qspi->clk); if (ret) { dev_err(dev, "can not enable the clock\n"); - goto err_master_put; + return ret; } rstc = devm_reset_control_get_exclusive(dev, NULL); @@ -784,7 +772,7 @@ static int stm32_qspi_probe(struct platf pm_runtime_enable(dev); pm_runtime_get_noresume(dev); - ret = devm_spi_register_master(dev, ctrl); + ret = spi_register_master(ctrl); if (ret) goto err_pm_runtime_free; @@ -806,8 +794,6 @@ err_dma_free: stm32_qspi_dma_free(qspi); err_clk_disable: clk_disable_unprepare(qspi->clk); -err_master_put: - spi_master_put(qspi->ctrl); return ret; } @@ -817,6 +803,7 @@ static int stm32_qspi_remove(struct plat struct stm32_qspi *qspi = platform_get_drvdata(pdev); pm_runtime_get_sync(qspi->dev); + spi_unregister_master(qspi->ctrl); /* disable qspi */ writel_relaxed(0, qspi->io_base + QSPI_CR); stm32_qspi_dma_free(qspi); Patches currently in stable-queue which might be from patrice.chotard@xxxxxxxxxxx are queue-5.16/spi-stm32-qspi-update-spi-registering.patch