From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Date: Tue, 6 May 2014 17:41:36 +0000 (+0200)
Subject: s390/spinlock: fix system hang with spin_retry <= 0
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~33^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e4006b34d06681ed95d55510d4450f29a13c417;p=pandora-kernel.git

s390/spinlock: fix system hang with spin_retry <= 0

On LPAR, when spin_retry is set to <= 0, arch_spin_lock_wait() and
arch_spin_lock_wait_flags() may end up in a while(1) loop w/o doing
any compare and swap operation. To fix this, use do/while instead of
for loop.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

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