From: Anatolij Gustschin <agust@denx.de>
Date: Mon, 8 Apr 2013 21:28:05 +0000 (+0200)
Subject: mmc: mxcmmc: fix race conditions for host->req and host->data access
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~41^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70aa6109597ea6955a93f16430b588b5ee5ba547;p=pandora-kernel.git

mmc: mxcmmc: fix race conditions for host->req and host->data access

mxcmci_dma_callback() is invoked by DMA drivers in soft-irq
context and can be interrupted by the mxcmci_irq() interrupt
which can finish the mmc request or data transfer and set
host->req or host->data pointers to NULL. Then mxcmci_data_done()
crashes with a null pointer dereferences. Protect all accesses
to host->req and host->data by spin locks.

Also check host->data pointer in mxcmci_watchdog() before
dereferencing it.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
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