mmc: mxs: Initialize the spinlock prior to using it

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@nxp.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
[bwh: Backported to 3.16 adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index babfea03ba8a0ce50b64fae4e0bcbcc96ef0e60e..ad32f235bdb86902754adfa37f1199e03d69cfd2 100644 (file)
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -658,13 +658,13 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, mmc);
 
+       spin_lock_init(&host->lock);
+
        ret = devm_request_irq(&pdev->dev, irq_err, 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_dma;