Finally, we can get rid of the host->lock spinlock, and turn it into a mutex.
This patch does just this. Patch based on: http://thread.gmane.org/gmane.linux.kernel.mmc/2579. Signed-off-by: Anton Vorontsov <[email protected]> Signed-off-by: Jeremie Samuel <[email protected]> --- drivers/mmc/host/sdhci.c | 99 ++++++++++++++++++++------------------------- include/linux/mmc/sdhci.h | 3 +- 2 files changed, 46 insertions(+), 56 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index c2585dd..10a7684 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -20,6 +20,7 @@ #include <linux/module.h> #include <linux/dma-mapping.h> #include <linux/slab.h> +#include <linux/mutex.h> #include <linux/scatterlist.h> #include <linux/regulator/consumer.h> #include <linux/pm_runtime.h> @@ -1314,14 +1315,13 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct sdhci_host *host; int present; - unsigned long flags; u32 tuning_opcode; host = mmc_priv(mmc); sdhci_runtime_pm_get(host); - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); WARN_ON(host->mrq != NULL); @@ -1377,9 +1377,9 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) mmc->card->type == MMC_TYPE_MMC ? MMC_SEND_TUNING_BLOCK_HS200 : MMC_SEND_TUNING_BLOCK; - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); sdhci_execute_tuning(mmc, tuning_opcode); - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); /* Restore original mmc_request structure */ host->mrq = mrq; @@ -1393,19 +1393,18 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) } mmiowb(); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios) { - unsigned long flags; int vdd_bit = -1; u8 ctrl; - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); if (host->flags & SDHCI_DEVICE_DEAD) { - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); if (host->vmmc && ios->power_mode == MMC_POWER_OFF) mmc_regulator_set_ocr(host->mmc, host->vmmc, 0); return; @@ -1432,9 +1431,9 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios) vdd_bit = sdhci_set_power(host, ios->vdd); if (host->vmmc && vdd_bit != -1) { - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); mmc_regulator_set_ocr(host->mmc, host->vmmc, vdd_bit); - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); } if (host->ops->platform_send_init_74_clocks) @@ -1572,7 +1571,7 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios) sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); mmiowb(); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) @@ -1617,10 +1616,9 @@ static int sdhci_get_cd(struct mmc_host *mmc) static int sdhci_check_ro(struct sdhci_host *host) { - unsigned long flags; int is_readonly; - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); if (host->flags & SDHCI_DEVICE_DEAD) is_readonly = 0; @@ -1630,7 +1628,7 @@ static int sdhci_check_ro(struct sdhci_host *host) is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_WRITE_PROTECT); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); /* This quirk needs to be replaced by a callback-function later */ return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ? @@ -1701,11 +1699,10 @@ out: static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable) { struct sdhci_host *host = mmc_priv(mmc); - unsigned long flags; - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); sdhci_enable_sdio_irq_nolock(host, enable); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host, @@ -1836,7 +1833,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) sdhci_runtime_pm_get(host); disable_irq(host->irq); - spin_lock(&host->lock); + mutex_lock(&host->lock); ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); @@ -1856,7 +1853,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) requires_tuning_nonuhs) ctrl |= SDHCI_CTRL_EXEC_TUNING; else { - spin_unlock(&host->lock); + mutex_unlock(&host->lock); enable_irq(host->irq); sdhci_runtime_pm_put(host); return 0; @@ -1929,7 +1926,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) host->cmd = NULL; host->mrq = NULL; - spin_unlock(&host->lock); + mutex_unlock(&host->lock); enable_irq(host->irq); /* Wait for Buffer Read Ready interrupt */ @@ -1937,7 +1934,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) (host->tuning_done == 1), msecs_to_jiffies(50)); disable_irq(host->irq); - spin_lock(&host->lock); + mutex_lock(&host->lock); if (!host->tuning_done) { pr_info(DRIVER_NAME ": Timeout waiting for " @@ -2012,7 +2009,7 @@ out: err = 0; sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier); - spin_unlock(&host->lock); + mutex_unlock(&host->lock); enable_irq(host->irq); sdhci_runtime_pm_put(host); @@ -2048,9 +2045,8 @@ static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable) static void sdhci_card_event(struct mmc_host *mmc) { struct sdhci_host *host = mmc_priv(mmc); - unsigned long flags; - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); /* Check host->mrq first in case we are runtime suspended */ if (host->mrq && @@ -2067,7 +2063,7 @@ static void sdhci_card_event(struct mmc_host *mmc) schedule_work(&host->finish_work); } - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } static const struct mmc_host_ops sdhci_ops = { @@ -2102,19 +2098,18 @@ static void sdhci_card_detect_work(struct work_struct *wk) static void sdhci_finish_work(struct work_struct *wk) { struct sdhci_host *host; - unsigned long flags; struct mmc_request *mrq; host = container_of(wk, struct sdhci_host, finish_work); - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); /* * If this work gets rescheduled while running, it will * be run again afterwards but without any active request. */ if (!host->mrq) { - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); return; } @@ -2148,24 +2143,23 @@ static void sdhci_finish_work(struct work_struct *wk) host->data = NULL; mmiowb(); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); mmc_request_done(host->mmc, mrq); sdhci_runtime_pm_put(host); - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); sdhci_deactivate_led(host); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } static void sdhci_timeout_work(struct work_struct *wk) { struct sdhci_host *host; - unsigned long flags; host = container_of(wk, struct sdhci_host, timeout_work.work); - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); if (host->mrq) { pr_err("%s: Timeout waiting for hardware " @@ -2186,21 +2180,20 @@ static void sdhci_timeout_work(struct work_struct *wk) } mmiowb(); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } static void sdhci_tuning_timeout_work(struct work_struct *wk) { struct sdhci_host *host; - unsigned long flags; host = container_of(wk, struct sdhci_host, tuning_timeout_work.work); - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); host->flags |= SDHCI_NEEDS_RETUNING; - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } /*****************************************************************************\ @@ -2394,10 +2387,10 @@ static irqreturn_t sdhci_irq_thread(int irq, void *dev_id) u32 intmask, unexpected = 0; int cardint = 0, max_loops = 16; - spin_lock(&host->lock); + mutex_lock(&host->lock); if (host->runtime_suspended) { - spin_unlock(&host->lock); + mutex_unlock(&host->lock); pr_warning("%s: got irq while runtime suspended\n", mmc_hostname(host->mmc)); return IRQ_HANDLED; @@ -2469,7 +2462,7 @@ again: if (intmask && --max_loops) goto again; - spin_unlock(&host->lock); + mutex_unlock(&host->lock); if (unexpected) { pr_err("%s: Unexpected interrupt 0x%08x.\n", @@ -2642,7 +2635,6 @@ static int sdhci_runtime_pm_put(struct sdhci_host *host) int sdhci_runtime_suspend_host(struct sdhci_host *host) { - unsigned long flags; int ret = 0; /* Disable tuning since we are suspending */ @@ -2651,15 +2643,15 @@ int sdhci_runtime_suspend_host(struct sdhci_host *host) host->flags &= ~SDHCI_NEEDS_RETUNING; } - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); synchronize_irq(host->irq); - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); host->runtime_suspended = true; - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); return ret; } @@ -2667,7 +2659,6 @@ EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host); int sdhci_runtime_resume_host(struct sdhci_host *host) { - unsigned long flags; int ret = 0, host_flags = host->flags; if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { @@ -2685,16 +2676,16 @@ int sdhci_runtime_resume_host(struct sdhci_host *host) sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios); if ((host_flags & SDHCI_PV_ENABLED) && !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) { - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); sdhci_enable_preset_value(host, true); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } /* Set the re-tuning expiration flag */ if (host->flags & SDHCI_USING_RETUNING_TIMER) host->flags |= SDHCI_NEEDS_RETUNING; - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); host->runtime_suspended = false; @@ -2705,7 +2696,7 @@ int sdhci_runtime_resume_host(struct sdhci_host *host) /* Enable Card Detection */ sdhci_enable_card_detection(host); - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); return ret; } @@ -3114,7 +3105,7 @@ int sdhci_add_host(struct sdhci_host *host) return -ENODEV; } - spin_lock_init(&host->lock); + mutex_init(&host->lock); /* * Maximum number of segments. Depends on if the hardware @@ -3242,10 +3233,8 @@ EXPORT_SYMBOL_GPL(sdhci_add_host); void sdhci_remove_host(struct sdhci_host *host, int dead) { - unsigned long flags; - if (dead) { - spin_lock_irqsave(&host->lock, flags); + mutex_lock(&host->lock); host->flags |= SDHCI_DEVICE_DEAD; @@ -3257,7 +3246,7 @@ void sdhci_remove_host(struct sdhci_host *host, int dead) schedule_work(&host->finish_work); } - spin_unlock_irqrestore(&host->lock, flags); + mutex_unlock(&host->lock); } sdhci_disable_card_detection(host); diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h index 8002d17..e2624066 100644 --- a/include/linux/mmc/sdhci.h +++ b/include/linux/mmc/sdhci.h @@ -15,6 +15,7 @@ #include <linux/workqueue.h> #include <linux/compiler.h> #include <linux/types.h> +#include <linux/mutex.h> #include <linux/io.h> #include <linux/mmc/host.h> @@ -115,7 +116,7 @@ struct sdhci_host { enum led_brightness brightness; #endif - spinlock_t lock; /* Mutex */ + struct mutex lock; /* Mutex */ int flags; /* Host attributes */ #define SDHCI_USE_SDMA (1<<0) /* Host is SDMA capable */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
