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>
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index f9ed5e2..0bfea9c 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -148,6 +148,8 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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)) {