linux-kernel - [PATCH 3.19.y-ckt 035/210] mmc: sdhci: Fix sdhci_runtime_pm_bus

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Message-Id: <1454030348-17736-36-git-send-email-kamal@canonical.com>
Date:	Thu, 28 Jan 2016 17:16:13 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 035/210] mmc: sdhci: Fix sdhci_runtime_pm_bus_on/off()

3.19.8-ckt14 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Adrian Hunter <adrian.hunter@...el.com>

commit 5c671c410c8704800f4f1673b6f572137e7e6ddd upstream.

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 <adrian.hunter@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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 7cec488..f4a7abf 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2743,7 +2743,7 @@ 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);
@@ -2751,7 +2751,7 @@ 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);
-- 
1.9.1