omap_hsmmc: prevent races with irq handler

If an unexpected interrupt occurs while preparing the next request, an
oops can occur.

For example, a new request is setting up DMA for data transfer so
host->data is not NULL.  An unexpected transfer complete (TC) interrupt
comes along and the interrupt handler sets host->data to NULL.  Oops!

Prevent that by adding a spinlock.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Cc: Denis Karpov <ext-denis.2.karpov@nokia.com>
Cc: Pierre Ossman <pierre@ossman.eu>
Cc: Philip Langdale <philipl@overt.org>
Cc: "Madhusudhan" <madhu.cr@ti.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index f9ed5e23f145..0bfea9c2a597 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)) {