linux/drivers/mmc
Jisheng Zhang 3bb10f6093 mmc: sdhci-pxav3: fix race between runtime pm and irq
This patch is to fix a race condition that may cause an unhandled irq,
which results in big sdhci interrupt numbers and endless "mmc1: got irq
while runtime suspended" msgs before v3.15.

Consider following scenario:

      CPU0                            CPU1
                              sdhci_pxav3_runtime_suspend()
                               spin_lock_irqsave(&host->lock, flags);
 sdhci_irq()
  spining on the &host->lock
                               host->runtime_suspended = true;
                               spin_unlock_irqrestore(&host->lock, flags);
  get the &host->lock
  runtime_suspended is true now
  return IRQ_NONE;

Fix this race by using the core sdhci.c supplied sdhci_runtime_suspend_host()
in runtime suspend hook which will disable card interrupts. We also use the
sdhci_runtime_resume_host() in the runtime resume hook accordingly.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Cc: <stable@vger.kernel.org> # v3.9+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-01-28 12:32:18 +01:00
..
card mmc: block: Remove unnecessary temporary variable 2015-01-28 12:32:17 +01:00
core mmc: pwrseq_simple: Add support for a reset GPIO pin 2015-01-28 12:32:13 +01:00
host mmc: sdhci-pxav3: fix race between runtime pm and irq 2015-01-28 12:32:18 +01:00
Kconfig
Makefile mmc: sdhci-pci: add platform data 2012-01-11 23:58:47 -05:00