linux-kernel - [PATCH 06/14] MTD: nand: make suspend work if device is accessed by kernel threads.

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Message-Id: <1266066193-17625-7-git-send-email-maximlevitsky@gmail.com>
Date:	Sat, 13 Feb 2010 15:03:05 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Artem Bityutskiy <dedekind1@...il.com>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alex Dubov <oakad@...oo.com>, joern <joern@...fs.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"stanley.miao" <stanley.miao@...driver.com>,
	Vitaly Wool <vitalywool@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: [PATCH 06/14] MTD: nand: make suspend work if device is accessed by kernel threads.

Since all userspace threads are frozen at the time the nand_suspend is called,
they aren't inside any nand function.

We don't call try_to_freeze in nand ether. Thus the only user that can be inside
the nand functions is an non freezeable kernel thread.
Thus we can safely wait for it to finish.

Signed-off-by: Maxim Levitsky <maximlevitsky@...il.com>
---
 drivers/mtd/nand/nand_base.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 8f2958f..279b960 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -744,9 +744,6 @@ nand_get_device(struct nand_chip *chip, struct mtd_info *mtd, int new_state)
 			chip->state = FL_PM_SUSPENDED;
 			spin_unlock(lock);
 			return 0;
-		} else {
-			spin_unlock(lock);
-			return -EAGAIN;
 		}
 	}
 	set_current_state(TASK_UNINTERRUPTIBLE);
-- 
1.6.3.3

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