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mmc: tmio: Further fixup runtime PM management at remove

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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 <[email protected]>
Reviewed-by: Wolfram Sang <[email protected]>
Tested-by: Wolfram Sang <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Tested-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Ulf Hansson 2020-05-19 17:24:34 +02:00 • committed by Greg Kroah-Hartman
commit 1ccf2d6c5b
1 changed files with 4 additions and 2 deletions
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6
drivers/mmc/host/tmio_mmc_core.c
View file

@ -1285,12 +1285,14 @@ void tmio_mmc_host_remove(struct tmio_mmc_host *host)
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);