mmc: core: Keep host claimed while invoking mmc_power_off|up()

As mmc_claim_host() invokes pm_runtime_get_sync() for the mmc host device,
it's important that the host is kept claimed for *all* accesses to it via
the host_ops callbacks.

In some code paths for SDIO, particularly related to the PM support,
mmc_power_off|up() is invoked without keeping the host claimed. Let's fix
these.

Moreover, mmc_start|stop_host() also invokes mmc_power_off|up() without
claiming the host, let's fix these as well.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index a3eb20b..2092a89 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2633,10 +2633,14 @@ void mmc_start_host(struct mmc_host *host)
        host->f_init = max(freqs[0], host->f_min);
        host->rescan_disable = 0;
        host->ios.power_mode = MMC_POWER_UNDEFINED;
+
+       mmc_claim_host(host);
        if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
                mmc_power_off(host);
        else
                mmc_power_up(host, host->ocr_avail);
+       mmc_release_host(host);
+
        mmc_gpiod_request_cd_irq(host);
        _mmc_detect_change(host, 0, false);
 }
@@ -2674,7 +2678,9 @@ void mmc_stop_host(struct mmc_host *host)
 
        BUG_ON(host->card);
 
+       mmc_claim_host(host);
        mmc_power_off(host);
+       mmc_release_host(host);
 }
 
 int mmc_power_save_host(struct mmc_host *host)

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index b91abed..95bc101 100644 (file)
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -897,11 +897,10 @@ static int mmc_sdio_pre_suspend(struct mmc_host *host)
  */
 static int mmc_sdio_suspend(struct mmc_host *host)
 {
-       if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
-               mmc_claim_host(host);
+       mmc_claim_host(host);
+
+       if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
                sdio_disable_wide(host->card);
-               mmc_release_host(host);
-       }
 
        if (!mmc_card_keep_power(host)) {
                mmc_power_off(host);
@@ -910,6 +909,8 @@ static int mmc_sdio_suspend(struct mmc_host *host)
                mmc_retune_needed(host);
        }
 
+       mmc_release_host(host);
+
        return 0;
 }
 
@@ -1018,15 +1019,24 @@ out:
 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
 {
        /* No references to the card, cut the power to it. */
+       mmc_claim_host(host);
        mmc_power_off(host);
+       mmc_release_host(host);
+
        return 0;
 }
 
 static int mmc_sdio_runtime_resume(struct mmc_host *host)
 {
+       int ret;
+
        /* Restore power and re-initialize. */
+       mmc_claim_host(host);
        mmc_power_up(host, host->card->ocr);
-       return mmc_sdio_power_restore(host);
+       ret = mmc_sdio_power_restore(host);
+       mmc_release_host(host);
+
+       return ret;
 }
 
 static int mmc_sdio_reset(struct mmc_host *host)