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@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 724cb2c..8f2958f 100644 (file)
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -740,8 +740,14 @@ nand_get_device(struct nand_chip *chip, struct mtd_info *mtd, int new_state)
                return 0;
        }
        if (new_state == FL_PM_SUSPENDED) {
-               spin_unlock(lock);
-               return (chip->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
+               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);