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spi: stm32-qspi: Fix error path in case of -EPROBE_DEFER 

In case of -EPROBE_DEFER, stm32_qspi_release() was called
in any case which unregistered driver from pm_runtime framework
even if it has not been registered yet to it. This leads to:

stm32-qspi 58003000.spi: can't setup spi0.0, status -13
spi_master spi0: spi_device register error /soc/spi@58003000/mx66l51235l@0
spi_master spi0: Failed to create SPI device for /soc/spi@58003000/mx66l51235l@0
stm32-qspi 58003000.spi: can't setup spi0.1, status -13
spi_master spi0: spi_device register error /soc/spi@58003000/mx66l51235l@1
spi_master spi0: Failed to create SPI device for /soc/spi@58003000/mx66l51235l@1

On v5.7 kernel,this issue was not "visible", qspi driver was probed
successfully.

Fixes: 9d282c17b0 ("spi: stm32-qspi: Add pm_runtime support")

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Link: https://lore.kernel.org/r/20200616113035.4514-1-patrice.chotard@st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Patrice Chotard 2020-06-16 13:30:35 +02:00 коммит произвёл Mark Brown
Родитель 27784a256c
Коммит 35700e221b
Не найден ключ, соответствующий данной подписи
Идентификатор ключа GPG: 24D68B725D5487D0
1 изменённых файлов: 26 добавлений и 20 удалений
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46
drivers/spi/spi-stm32-qspi.c
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@ -553,20 +553,6 @@ static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
.exec_op = stm32_qspi_exec_op,
};
static void stm32_qspi_release(struct stm32_qspi *qspi)
{
pm_runtime_get_sync(qspi->dev);
/* disable qspi */
writel_relaxed(0, qspi->io_base + QSPI_CR);
stm32_qspi_dma_free(qspi);
mutex_destroy(&qspi->lock);
pm_runtime_put_noidle(qspi->dev);
pm_runtime_disable(qspi->dev);
pm_runtime_set_suspended(qspi->dev);
pm_runtime_dont_use_autosuspend(qspi->dev);
clk_disable_unprepare(qspi->clk);
}
static int stm32_qspi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -642,7 +628,7 @@ static int stm32_qspi_probe(struct platform_device *pdev)
if (IS_ERR(rstc)) {
ret = PTR_ERR(rstc);
if (ret == -EPROBE_DEFER)
goto err_qspi_release;
goto err_clk_disable;
} else {
reset_control_assert(rstc);
udelay(2);
@ -653,7 +639,7 @@ static int stm32_qspi_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, qspi);
ret = stm32_qspi_dma_setup(qspi);
if (ret)
goto err_qspi_release;
goto err_dma_free;
mutex_init(&qspi->lock);
@ -673,15 +659,26 @@ static int stm32_qspi_probe(struct platform_device *pdev)
ret = devm_spi_register_master(dev, ctrl);
if (ret)
goto err_qspi_release;
goto err_pm_runtime_free;
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return 0;
err_qspi_release:
stm32_qspi_release(qspi);
err_pm_runtime_free:
pm_runtime_get_sync(qspi->dev);
/* disable qspi */
writel_relaxed(0, qspi->io_base + QSPI_CR);
mutex_destroy(&qspi->lock);
pm_runtime_put_noidle(qspi->dev);
pm_runtime_disable(qspi->dev);
pm_runtime_set_suspended(qspi->dev);
pm_runtime_dont_use_autosuspend(qspi->dev);
err_dma_free:
stm32_qspi_dma_free(qspi);
err_clk_disable:
clk_disable_unprepare(qspi->clk);
err_master_put:
spi_master_put(qspi->ctrl);
@ -692,7 +689,16 @@ static int stm32_qspi_remove(struct platform_device *pdev)
{
struct stm32_qspi *qspi = platform_get_drvdata(pdev);
stm32_qspi_release(qspi);
pm_runtime_get_sync(qspi->dev);
/* disable qspi */
writel_relaxed(0, qspi->io_base + QSPI_CR);
stm32_qspi_dma_free(qspi);
mutex_destroy(&qspi->lock);
pm_runtime_put_noidle(qspi->dev);
pm_runtime_disable(qspi->dev);
pm_runtime_set_suspended(qspi->dev);
pm_runtime_dont_use_autosuspend(qspi->dev);
clk_disable_unprepare(qspi->clk);
return 0;
}