spi: atmel-quadspi: Free resources even if runtime resume failed in .remove()

An early error exit in atmel_qspi_remove() doesn't prevent the device
unbind. So this results in an spi controller with an unbound parent
and unmapped register space (because devm_ioremap_resource() is undone).
So using the remaining spi controller probably results in an oops.

Instead unregister the controller unconditionally and only skip hardware
access and clk disable.

Also add a warning about resume failing and return zero unconditionally.
The latter has the only effect to suppress a less helpful error message by
the spi core.

Fixes: 4a2f83b7f780 ("spi: atmel-quadspi: add runtime pm support")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20230317084232.142257-3-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
index 0c6f80d..713a4d6 100644 (file)
--- a/drivers/spi/atmel-quadspi.c
+++ b/drivers/spi/atmel-quadspi.c
@@ -706,18 +706,28 @@ static int atmel_qspi_remove(struct platform_device *pdev)
        struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
        int ret;
 
-       ret = pm_runtime_resume_and_get(&pdev->dev);
-       if (ret < 0)
-               return ret;
-
        spi_unregister_controller(ctrl);
-       atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR);
+
+       ret = pm_runtime_get_sync(&pdev->dev);
+       if (ret >= 0) {
+               atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR);
+               clk_disable(aq->qspick);
+               clk_disable(aq->pclk);
+       } else {
+               /*
+                * atmel_qspi_runtime_{suspend,resume} just disable and enable
+                * the two clks respectively. So after resume failed these are
+                * off, and we skip hardware access and disabling these clks again.
+                */
+               dev_warn(&pdev->dev, "Failed to resume device on remove\n");
+       }
+
+       clk_unprepare(aq->qspick);
+       clk_unprepare(aq->pclk);
 
        pm_runtime_disable(&pdev->dev);
        pm_runtime_put_noidle(&pdev->dev);
 
-       clk_disable_unprepare(aq->qspick);
-       clk_disable_unprepare(aq->pclk);
        return 0;
 }