From d1e4f74f911daee4d69b5fd0c81902f7d37de579 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 --- drivers/mmc/host/sdhci-msm.c | 8 -------- drivers/mmc/host/sdhci-of-arasan.c | 6 ------ drivers/mmc/host/sdhci-of-at91.c | 2 -- drivers/mmc/host/sdhci-pci-core.c | 4 ---- drivers/mmc/host/sdhci-pxav3.c | 5 +---- drivers/mmc/host/sdhci-s3c.c | 4 ---- drivers/mmc/host/sdhci.c | 9 --------- 7 files changed, 1 insertion(+), 37 deletions(-) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 10cdc84..9d601dc 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -991,12 +991,8 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host, mmc_hostname(host->mmc), host->clock, uhs, ctrl_2); sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); - spin_unlock_irq(&host->lock); - if (mmc->ios.timing == MMC_TIMING_MMC_HS400) sdhci_msm_hs400(host, &mmc->ios); - - spin_lock_irq(&host->lock); } static void sdhci_msm_voltage_switch(struct sdhci_host *host) @@ -1089,13 +1085,9 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock) goto out; } - spin_unlock_irq(&host->lock); - sdhci_msm_hc_select_mode(host); msm_set_clock_rate_for_bus_mode(host, clock); - - spin_lock_irq(&host->lock); out: __sdhci_msm_set_clock(host, clock); } diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index 28feb53..61accf0 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-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c index 3f08b7e..7611fd6 100644 --- a/drivers/mmc/host/sdhci-of-at91.c +++ b/drivers/mmc/host/sdhci-of-at91.c @@ -98,9 +98,7 @@ static void sdhci_at91_set_power(struct sdhci_host *host, unsigned char mode, if (!IS_ERR(host->mmc->supply.vmmc)) { 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); } sdhci_set_power_noreg(host, mode, vdd); } diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c index 5c62020..98ed90c 100644 --- a/drivers/mmc/host/sdhci-pci-core.c +++ b/drivers/mmc/host/sdhci-pci-core.c @@ -484,8 +484,6 @@ 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. @@ -498,8 +496,6 @@ 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 = { diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c index 22ed904..f953f35 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 d02284d..7c065a7 100644 --- a/drivers/mmc/host/sdhci-s3c.c +++ b/drivers/mmc/host/sdhci-s3c.c @@ -190,9 +190,7 @@ static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost, * speed possible with selected clock source and skip the division. */ if (ourhost->no_divider) { - spin_unlock_irq(&ourhost->host->lock); rate = clk_round_rate(clksrc, wanted); - spin_lock_irq(&ourhost->host->lock); return wanted - rate; } @@ -389,9 +387,7 @@ 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 e055bd3..5c2b35d 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1361,9 +1361,7 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk) sdhci_dumpregs(host); return; } - spin_unlock_irq(&host->lock); udelay(10); - spin_lock_irq(&host->lock); } clk |= SDHCI_CLOCK_CARD_EN; @@ -1392,9 +1390,7 @@ 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); @@ -1574,16 +1570,12 @@ 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; if (ios->power_mode == MMC_POWER_UNDEFINED) return; - 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); @@ -1729,7 +1721,6 @@ 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) -- 2.7.4