From: Ulf Hansson ulf.hansson@linaro.org
commit 4bd784411aca022622e484eb262f5a0540ae732c upstream.
Before calling tmio_mmc_host_probe(), the caller is required to enable clocks for its device, as to make it accessible when reading/writing registers during probe.
Therefore, the responsibility to disable these clocks, in the error path of ->probe() and during ->remove(), is better managed outside tmio_mmc_host_remove(). As a matter of fact, callers of tmio_mmc_host_remove() already expects this to be the behaviour.
However, there's a problem with tmio_mmc_host_remove() when the Kconfig option, CONFIG_PM, is set. More precisely, tmio_mmc_host_remove() may then disable the clock via runtime PM, which leads to clock enable/disable imbalance problems, when the caller of tmio_mmc_host_remove() also tries to disable the same clocks.
To solve the problem, let's make sure tmio_mmc_host_remove() leaves the device with clocks enabled, but also make sure to disable the IRQs, as we normally do at ->runtime_suspend().
Reported-by: Geert Uytterhoeven geert+renesas@glider.be Reviewed-by: Wolfram Sang wsa+renesas@sang-engineering.com Tested-by: Wolfram Sang wsa+renesas@sang-engineering.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200519152434.6867-1-ulf.hansson@linaro.org Tested-by: Geert Uytterhoeven geert+renesas@glider.be Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mmc/host/tmio_mmc_core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/mmc/host/tmio_mmc_core.c +++ b/drivers/mmc/host/tmio_mmc_core.c @@ -1285,12 +1285,14 @@ void tmio_mmc_host_remove(struct tmio_mm cancel_work_sync(&host->done); cancel_delayed_work_sync(&host->delayed_reset_work); tmio_mmc_release_dma(host); + tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
- pm_runtime_dont_use_autosuspend(&pdev->dev); if (host->native_hotplug) pm_runtime_put_noidle(&pdev->dev); - pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); } EXPORT_SYMBOL_GPL(tmio_mmc_host_remove);