linux-kernel - [PATCH 12/17] MTD: nand: make suspend work if device is accessed by kernel threads.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1265326257-4446-13-git-send-email-maximlevitsky@gmail.com>
Date:	Fri,  5 Feb 2010 01:30:52 +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>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: [PATCH 12/17] 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 insize
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 29e986e..961c98f 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/