From: Adrian Hunter Date: Thu, 26 Nov 2015 12:00:50 +0000 (+0200) Subject: mmc: sdhci: Fix sdhci_runtime_pm_bus_on/off() X-Git-Tag: v4.5-rc1~155^2~18 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5c671c410c8704800f4f1673b6f572137e7e6ddd;p=platform%2Fkernel%2Flinux-exynos.git mmc: sdhci: Fix sdhci_runtime_pm_bus_on/off() sdhci has a legacy facility to prevent runtime suspend if the bus power is on. This is needed in cases where the power to the card is dependent on the bus power. It is controlled by a pair of functions: sdhci_runtime_pm_bus_on() and sdhci_runtime_pm_bus_off(). These functions use a boolean variable 'bus_on' to ensure changes are always paired. There is an additional check for 'runtime_suspended' which is the problem. In fact, its use is ill-conceived as the only requirement for the logic is that 'on' and 'off' are paired, which is actually broken by the check, for example if the bus power is turned on during runtime resume. So remove the check. Signed-off-by: Adrian Hunter Cc: stable@vger.kernel.org # v3.11+ Signed-off-by: Ulf Hansson --- diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 1a8f42e..2753b722d 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2755,7 +2755,7 @@ static int sdhci_runtime_pm_put(struct sdhci_host *host) static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) { - if (host->runtime_suspended || host->bus_on) + if (host->bus_on) return; host->bus_on = true; pm_runtime_get_noresume(host->mmc->parent); @@ -2763,7 +2763,7 @@ static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) static void sdhci_runtime_pm_bus_off(struct sdhci_host *host) { - if (host->runtime_suspended || !host->bus_on) + if (!host->bus_on) return; host->bus_on = false; pm_runtime_put_noidle(host->mmc->parent);