From 7ad9a012c66b527e5e0a62aa9b86e2b4f7eff0c5 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Mon, 20 Mar 2017 19:50:37 +0200 Subject: [PATCH] mmc: sdhci: Do not use spin lock in set_ios paths The spin lock is not necessary in set_ios. Anything that is racing with changes to the I/O state is already broken. The mmc core already provides synchronization via "claiming" the host. So remove spin_lock and friends from sdhci_set_ios and related callbacks. Signed-off-by: Adrian Hunter Signed-off-by: Ulf Hansson Tested-by: Ludovic Desroches (cherry picked from commit d1e4f74f911daee4d69b5fd0c81902f7d37de579) Conflicts: drivers/mmc/host/sdhci-msm.c drivers/mmc/host/sdhci-of-at91.c drivers/mmc/host/sdhci.c --- drivers/mmc/host/sdhci-of-arasan.c | 6 ------ drivers/mmc/host/sdhci-pxav3.c | 5 +---- drivers/mmc/host/sdhci-s3c.c | 2 -- drivers/mmc/host/sdhci.c | 7 ------- 4 files changed, 1 insertion(+), 19 deletions(-) diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index 1cfd7f900339..ed4da28f24ad 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -194,9 +194,7 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) * through low speeds without power cycling. */ sdhci_set_clock(host, host->max_clk); - spin_unlock_irq(&host->lock); phy_power_on(sdhci_arasan->phy); - spin_lock_irq(&host->lock); sdhci_arasan->is_phy_on = true; /* @@ -215,18 +213,14 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) } if (ctrl_phy && sdhci_arasan->is_phy_on) { - spin_unlock_irq(&host->lock); phy_power_off(sdhci_arasan->phy); - spin_lock_irq(&host->lock); sdhci_arasan->is_phy_on = false; } sdhci_set_clock(host, clock); if (ctrl_phy) { - spin_unlock_irq(&host->lock); phy_power_on(sdhci_arasan->phy); - spin_lock_irq(&host->lock); sdhci_arasan->is_phy_on = true; } } diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c index d0f5c05fbc19..3c29776020bd 100644 --- a/drivers/mmc/host/sdhci-pxav3.c +++ b/drivers/mmc/host/sdhci-pxav3.c @@ -323,11 +323,8 @@ static void pxav3_set_power(struct sdhci_host *host, unsigned char mode, if (host->pwr == 0) vdd = 0; - if (!IS_ERR(mmc->supply.vmmc)) { - spin_unlock_irq(&host->lock); + if (!IS_ERR(mmc->supply.vmmc)) mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); - spin_lock_irq(&host->lock); - } } static const struct sdhci_ops pxav3_sdhci_ops = { diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c index 784c5a848fb4..34b5d1c057ea 100644 --- a/drivers/mmc/host/sdhci-s3c.c +++ b/drivers/mmc/host/sdhci-s3c.c @@ -318,9 +318,7 @@ static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock) clk &= ~SDHCI_CLOCK_CARD_EN; sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); - spin_unlock_irq(&host->lock); ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock); - spin_lock_irq(&host->lock); if (ret != 0) { dev_err(dev, "%s: failed to set clock rate %uHz\n", mmc_hostname(host->mmc), clock); diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index cac9951cca71..58ed5694f796 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1387,9 +1387,7 @@ static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode, { struct mmc_host *mmc = host->mmc; - spin_unlock_irq(&host->lock); mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); - spin_lock_irq(&host->lock); if (mode != MMC_POWER_OFF) sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL); @@ -1569,13 +1567,9 @@ EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling); static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct sdhci_host *host = mmc_priv(mmc); - unsigned long flags; u8 ctrl; - spin_lock_irqsave(&host->lock, flags); - if (host->flags & SDHCI_DEVICE_DEAD) { - spin_unlock_irqrestore(&host->lock, flags); if (!IS_ERR(mmc->supply.vmmc) && ios->power_mode == MMC_POWER_OFF) mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); @@ -1724,7 +1718,6 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); mmiowb(); - spin_unlock_irqrestore(&host->lock, flags); } static int sdhci_get_cd(struct mmc_host *mmc) -- 2.17.1