linux-kernel - [PATCH V2 26/32] omap_hsmmc: prevent races with irq handler

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Date:	Tue, 28 Jul 2009 13:41:47 +0300
From:	Adrian Hunter <adrian.hunter@...ia.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jarkko Lavinen <jarkko.lavinen@...ia.com>,
	Adrian Hunter <adrian.hunter@...ia.com>,
	linux-omap Mailing List <linux-omap@...r.kernel.org>,
	Pierre Ossman <pierre@...man.eu>,
	Denis Karpov <ext-denis.2.karpov@...ia.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH V2 26/32] omap_hsmmc: prevent races with irq handler

>From 4252559187e96877a2a7ab5a5b0d0631aa51c7d2 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@...ia.com>
Date: Sat, 16 May 2009 10:32:34 +0300
Subject: [PATCH] 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@...ia.com>
---
 drivers/mmc/host/omap_hsmmc.c |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 5121277..5213d87 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -146,6 +146,8 @@ 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;
@@ -452,6 +454,14 @@ 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);
 }
@@ -614,11 +624,14 @@ 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;
 	}
 
@@ -683,6 +696,8 @@ 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;
 }
 
@@ -1011,6 +1026,13 @@ 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);
@@ -1019,6 +1041,8 @@ 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;
 	}
@@ -1573,6 +1597,7 @@ 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)) {
-- 
1.5.6.3

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