From a2da01ce927dd98cb8f1a8f2d2343d2f5827b988 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Thu, 26 Nov 2015 14:00:50 +0200 Subject: [PATCH] mmc: sdhci: Fix sdhci_runtime_pm_bus_on/off() [ Upstream commit 5c671c410c8704800f4f1673b6f572137e7e6ddd ] 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 Signed-off-by: Sasha Levin --- drivers/mmc/host/sdhci.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6acef81..f47c4a8 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2793,7 +2793,7 @@ 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); @@ -2801,7 +2801,7 @@ 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); -- 2.7.4