From: Loic Poulain <loic.poulain@intel.com>
Date: Thu, 24 Apr 2014 09:34:48 +0000 (+0200)
Subject: serial: 8250: Fix thread unsafe __dma_tx_complete function
X-Git-Tag: omap-for-v3.16/pm-signed~45^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f8fd1b0350d3a4581125f5eda6528f5a2c5f9183;p=pandora-kernel.git

serial: 8250: Fix thread unsafe __dma_tx_complete function

__dma_tx_complete is not protected against concurrent
call of serial8250_tx_dma. it can lead to circular tail
index corruption or parallel call of serial_tx_dma on the
same data portion.

This patch fixes this issue by holding the port lock.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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