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authorDaniel Drake <drake@endlessm.com>2017-12-12 10:49:02 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-24 10:58:47 +0100
commit3ed000cd769223f2327504f0e6c22e0624cd102d (patch)
treeb5cc998e9c3d193159cc1668370bd64bc491152e
parentdf9d1861a08f9d2b0b351a58b358ea880a23504d (diff)
downloadlinux-linaro-stable-3ed000cd769223f2327504f0e6c22e0624cd102d.tar.gz
mmc: avoid removing non-removable hosts during suspend
[ Upstream commit de8dcc3d2c0e08e5068ee1e26fc46415c15e3637 ] The Weibu F3C MiniPC has an onboard AP6255 module, presenting two SDIO functions on a single MMC host (Bluetooth/btsdio and WiFi/brcmfmac), and the mmc layer correctly detects this as non-removable. After suspend/resume, the wifi and bluetooth interfaces disappear and do not get probed again. The conditions here are: 1. During suspend, we reach mmc_pm_notify() 2. mmc_pm_notify() calls mmc_sdio_pre_suspend() to see if we can suspend the SDIO host. However, mmc_sdio_pre_suspend() returns -ENOSYS because btsdio_driver does not have a suspend method. 3. mmc_pm_notify() proceeds to remove the card 4. Upon resume, mmc_rescan() does nothing with this host, because of the rescan_entered check which aims to only scan a non-removable device a single time (i.e. during boot). Fix the loss of functionality by detecting that we are unable to suspend a non-removable host, so avoid the forced removal in that case. The comment above this function already indicates that this code was only intended for removable devices. Signed-off-by: Daniel Drake <drake@endlessm.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/mmc/core/core.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5f7d10ba498a..299a83f1ad38 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2791,6 +2791,14 @@ int mmc_pm_notify(struct notifier_block *notify_block,
if (!err)
break;
+ if (!mmc_card_is_removable(host)) {
+ dev_warn(mmc_dev(host),
+ "pre_suspend failed for non-removable host: "
+ "%d\n", err);
+ /* Avoid removing non-removable hosts */
+ break;
+ }
+
/* Calling bus_ops->remove() with a claimed host can deadlock */
host->bus_ops->remove(host);
mmc_claim_host(host);