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From: Li Wang <li.wang@windriver.com>
To: <dwmw2@infradead.org>, <Artem.Bityutskiy@nokia.com>, <stefani@seibold.net>
CC: <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>
Subject: mtd: put flash block erasing into wait queue, if has any thread in queue
Date: Thu, 14 Aug 2014 17:50:32 +0800
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flash erasing maybe block writing operation.
make erasing operation sleep, when the other thread is in wait queue.