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path: root/drivers/mmc/host
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Diffstat (limited to 'drivers/mmc/host')
-rw-r--r--drivers/mmc/host/omap_hsmmc.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index f9ed5e23f14..0bfea9c2a59 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -148,6 +148,8 @@ struct mmc_omap_host {
struct work_struct mmc_carddetect_work;
void __iomem *base;
resource_size_t mapbase;
+ spinlock_t irq_lock; /* Prevent races with irq handler */
+ unsigned long flags;
unsigned int id;
unsigned int dma_len;
unsigned int dma_sg_idx;
@@ -459,6 +461,14 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd,
if (host->use_dma)
cmdreg |= DMA_EN;
+ /*
+ * In an interrupt context (i.e. STOP command), the spinlock is unlocked
+ * by the interrupt handler, otherwise (i.e. for a new request) it is
+ * unlocked here.
+ */
+ if (!in_interrupt())
+ spin_unlock_irqrestore(&host->irq_lock, host->flags);
+
OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
}
@@ -621,11 +631,14 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
struct mmc_data *data;
int end_cmd = 0, end_trans = 0, status;
+ spin_lock(&host->irq_lock);
+
if (host->mrq == NULL) {
OMAP_HSMMC_WRITE(host->base, STAT,
OMAP_HSMMC_READ(host->base, STAT));
/* Flush posted write */
OMAP_HSMMC_READ(host->base, STAT);
+ spin_unlock(&host->irq_lock);
return IRQ_HANDLED;
}
@@ -690,6 +703,8 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
if ((end_trans || (status & TC)) && host->mrq)
mmc_omap_xfer_done(host, data);
+ spin_unlock(&host->irq_lock);
+
return IRQ_HANDLED;
}
@@ -1018,6 +1033,13 @@ static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
struct mmc_omap_host *host = mmc_priv(mmc);
int err;
+ /*
+ * Prevent races with the interrupt handler because of unexpected
+ * interrupts, but not if we are already in interrupt context i.e.
+ * retries.
+ */
+ if (!in_interrupt())
+ spin_lock_irqsave(&host->irq_lock, host->flags);
WARN_ON(host->mrq != NULL);
host->mrq = req;
err = mmc_omap_prepare_data(host, req);
@@ -1026,6 +1048,8 @@ static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
if (req->data)
req->data->error = err;
host->mrq = NULL;
+ if (!in_interrupt())
+ spin_unlock_irqrestore(&host->irq_lock, host->flags);
mmc_request_done(mmc, req);
return;
}
@@ -1580,6 +1604,7 @@ static int __init omap_mmc_probe(struct platform_device *pdev)
mmc->f_max = 52000000;
sema_init(&host->sem, 1);
+ spin_lock_init(&host->irq_lock);
host->iclk = clk_get(&pdev->dev, "ick");
if (IS_ERR(host->iclk)) {