From 027fb89e61054b4aedd962adb3e2003dec78a716 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Mon, 20 Mar 2017 19:50:30 +0200 Subject: [PATCH] mmc: sdhci-pci: Do not disable interrupts in sdhci_intel_set_power Disabling interrupts for even a millisecond can cause problems for some devices. That can happen when Intel host controllers wait for the present state to propagate. The spin lock is not necessary here. Anything that is racing with changes to the I/O state is already broken. The mmc core already provides synchronization via "claiming" the host. Although the spin lock probably should be removed from the code paths that lead to this point, such a patch would touch too much code to be suitable for stable trees. Consequently, for this patch, just drop the spin lock while waiting. Signed-off-by: Adrian Hunter Cc: stable@vger.kernel.org # v4.9+ Signed-off-by: Ulf Hansson Tested-by: Ludovic Desroches --- drivers/mmc/host/sdhci-pci-core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c index 982b3e349426..86560d590786 100644 --- a/drivers/mmc/host/sdhci-pci-core.c +++ b/drivers/mmc/host/sdhci-pci-core.c @@ -451,6 +451,8 @@ static void sdhci_intel_set_power(struct sdhci_host *host, unsigned char mode, if (mode == MMC_POWER_OFF) return; + spin_unlock_irq(&host->lock); + /* * Bus power might not enable after D3 -> D0 transition due to the * present state not yet having propagated. Retry for up to 2ms. @@ -463,6 +465,8 @@ static void sdhci_intel_set_power(struct sdhci_host *host, unsigned char mode, reg |= SDHCI_POWER_ON; sdhci_writeb(host, reg, SDHCI_POWER_CONTROL); } + + spin_lock_irq(&host->lock); } static const struct sdhci_ops sdhci_intel_byt_ops = { -- 2.30.2