From: Andrew Liu <shengping.liu@windriver.com>
Date: Tue, 29 Apr 2008 07:36:25 +0000 (+1000)
Subject: Fix a potential issue in mpc52xx uart driver
X-Git-Tag: v2.6.26-rc1~7^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fbe543b412cef02350fab35526a6d4dc3d20d182;p=pandora-kernel.git

Fix a potential issue in mpc52xx uart driver

mpc52xx_uart_int and __uart_put_char both try to acquire the
port->lock. Therefore the function sequence of:

mpc52xx_uart_int--> ...-->flush_to_ldisc-->...-->__uart_put_char

can potentially trigger a deadlock. To avoid this deadlock a fix
similar to that found in the 8250.c serial driver is applied. The
deadlock is avoided by releasing the lock before pushing a buffer
and reacquiring it when completed.

Signed-off-by: Andrew Liu <shengping.liu@windriver.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---

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