linux-kernel - [PATCH] mtd/nand: fix multi-chip suspend problem

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Date:	Fri, 13 Nov 2009 19:22:33 +0800
From:	Li Yang <leoli@...escale.com>
To:	dwmw2@...radead.org
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Li Yang <leoli@...escale.com>, Jin Qing <b24347@...escale.com>
Subject: [PATCH] mtd/nand: fix multi-chip suspend problem

Symptom:
device_suspend(): mtd_cls_suspend+0x0/0x58 returns -11
PM: Device mtd14 failed to suspend: error -11
PM: Some devices failed to suspend

This patch enables other chips to be suspended if the active chip of
the controller has been suspended.

Signed-off-by: Jin Qing <b24347@...escale.com>
Signed-off-by: Li Yang <leoli@...escale.com>
---
 drivers/mtd/nand/nand_base.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 2957cc7..6d2f562 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -697,10 +697,16 @@ nand_get_device(struct nand_chip *chip, struct mtd_info *mtd, int new_state)
 		spin_unlock(lock);
 		return 0;
 	}
-	if (new_state == FL_PM_SUSPENDED) {
-		spin_unlock(lock);
-		return (chip->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
-	}
+	if (new_state == FL_PM_SUSPENDED)
+		if (chip->controller->active->state == FL_PM_SUSPENDED) {
+			chip->state = FL_PM_SUSPENDED;
+			spin_unlock(lock);
+			return 0;
+		} else {
+			spin_unlock(lock);
+			return -EAGAIN;
+		}
+
 	set_current_state(TASK_UNINTERRUPTIBLE);
 	add_wait_queue(wq, &wait);
 	spin_unlock(lock);
-- 
1.6.3.1.6.g4bf1f

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