linux-kernel - [PATCH 3.2 079/126] mmc: mxs: Initialize the spinlock prior to using it

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Message-ID: <lsq.1487198494.588731862@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Marek Vasut" <marex@...x.de>,
        "Fabio Estevam" <fabio.estevam@....com>,
        "Ulf Hansson" <ulf.hansson@...aro.org>
Subject: [PATCH 3.2 079/126] mmc: mxs: Initialize the spinlock prior to
 using it

3.2.85-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Fabio Estevam <fabio.estevam@....com>

commit f91346e8b5f46aaf12f1df26e87140584ffd1b3f upstream.

An interrupt may occur right after devm_request_irq() is called and
prior to the spinlock initialization, leading to a kernel oops,
as the interrupt handler uses the spinlock.

In order to prevent this problem, move the spinlock initialization
prior to requesting the interrupts.

Fixes: e4243f13d10e (mmc: mxs-mmc: add mmc host driver for i.MX23/28)
Signed-off-by: Fabio Estevam <fabio.estevam@....com>
Reviewed-by: Marek Vasut <marex@...x.de>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mmc/host/mxs-mmc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -752,12 +752,12 @@ static int mxs_mmc_probe(struct platform
 
 	platform_set_drvdata(pdev, mmc);
 
+	spin_lock_init(&host->lock);
+
 	ret = request_irq(host->irq, mxs_mmc_irq_handler, 0, DRIVER_NAME, host);
 	if (ret)
 		goto out_free_dma;
 
-	spin_lock_init(&host->lock);
-
 	ret = mmc_add_host(mmc);
 	if (ret)
 		goto out_free_irq;