mmc: dw_mmc: Protect read-modify-write of INTMASK with a lock

We're running into cases where our enabling of the SDIO interrupt in
dw_mmc doesn't actually take effect.  Specifically, adding patch like
this:

 +++ b/drivers/mmc/host/dw_mmc.c
 @@ -1076,6 +1076,9 @@ static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)

      mci_writel(host, INTMASK,
           (int_mask | SDMMC_INT_SDIO(slot->id)));
 +    int_mask = mci_readl(host, INTMASK);
 +    if (!(int_mask & SDMMC_INT_SDIO(slot->id)))
 +      dev_err(&mmc->class_dev, "failed to enable sdio irq\n");
    } else {

...actually triggers the error message.  That's because the
dw_mci_enable_sdio_irq() unsafely does a read-modify-write of the
INTMASK register.

We can't just use the standard host->lock since that lock is not irq
safe and mmc_signal_sdio_irq() (called from interrupt context) calls
dw_mci_enable_sdio_irq().  Add a new irq-safe lock to protect INTMASK.

An alternate solution to this is to punt mmc_signal_sdio_irq() to the
tasklet and then protect INTMASK modifications by the standard host
lock.  This seemed like a bit more of a high-latency change.

Reported-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index ae10a02..64ea042 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -759,6 +759,7 @@ disable:
 
 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
 {
+       unsigned long irqflags;
        int sg_len;
        u32 temp;
 
@@ -795,9 +796,11 @@ static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
        mci_writel(host, CTRL, temp);
 
        /* Disable RX/TX IRQs, let DMA handle it */
+       spin_lock_irqsave(&host->irq_lock, irqflags);
        temp = mci_readl(host, INTMASK);
        temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
        mci_writel(host, INTMASK, temp);
+       spin_unlock_irqrestore(&host->irq_lock, irqflags);
 
        host->dma_ops->start(host, sg_len);
 
@@ -806,6 +809,7 @@ static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
 
 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
 {
+       unsigned long irqflags;
        u32 temp;
 
        data->error = -EINPROGRESS;
@@ -834,9 +838,12 @@ static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
                host->part_buf_count = 0;
 
                mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
+
+               spin_lock_irqsave(&host->irq_lock, irqflags);
                temp = mci_readl(host, INTMASK);
                temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
                mci_writel(host, INTMASK, temp);
+               spin_unlock_irqrestore(&host->irq_lock, irqflags);
 
                temp = mci_readl(host, CTRL);
                temp &= ~SDMMC_CTRL_DMA_ENABLE;
@@ -1284,8 +1291,11 @@ static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
 {
        struct dw_mci_slot *slot = mmc_priv(mmc);
        struct dw_mci *host = slot->host;
+       unsigned long irqflags;
        u32 int_mask;
 
+       spin_lock_irqsave(&host->irq_lock, irqflags);
+
        /* Enable/disable Slot Specific SDIO interrupt */
        int_mask = mci_readl(host, INTMASK);
        if (enb)
@@ -1293,6 +1303,8 @@ static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
        else
                int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id);
        mci_writel(host, INTMASK, int_mask);
+
+       spin_unlock_irqrestore(&host->irq_lock, irqflags);
 }
 
 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
@@ -2661,6 +2673,7 @@ int dw_mci_probe(struct dw_mci *host)
        host->quirks = host->pdata->quirks;
 
        spin_lock_init(&host->lock);
+       spin_lock_init(&host->irq_lock);
        INIT_LIST_HEAD(&host->queue);
 
        /*

diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index 42b724e..471fb31 100644 (file)
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -106,6 +106,11 @@ struct mmc_data;
  * @cur_slot, @mrq and @state. These must always be updated
  * at the same time while holding @lock.
  *
+ * @irq_lock is an irq-safe spinlock protecting the INTMASK register
+ * to allow the interrupt handler to modify it directly.  Held for only long
+ * enough to read-modify-write INTMASK and no other locks are grabbed when
+ * holding this one.
+ *
  * The @mrq field of struct dw_mci_slot is also protected by @lock,
  * and must always be written at the same time as the slot is added to
  * @queue.
@@ -125,6 +130,7 @@ struct mmc_data;
  */
 struct dw_mci {
        spinlock_t              lock;
+       spinlock_t              irq_lock;
        void __iomem            *regs;
 
        struct scatterlist      *sg;