linux-kernel - [PATCH] mtd/chips: add missing set_current_state() to cfi_{amdstd,staa}

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Date:	Thu, 03 Apr 2008 21:38:23 +0200
From:	Dmitry Adamushko <dmitry.adamushko@...il.com>
To:	linux-mtd@...ts.infradead.org
Cc:	dwmw2@...radead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mtd/chips: add missing set_current_state() to
	cfi_{amdstd,staa}_sync()

From: Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: [mtd/chips] add missing set_current_state() to cfi_{amdstd,staa}_sync()

cfi_amdstd_sync() and cfi_staa_sync() call schedule() without changing
task's state appropriately.

In case of e.g. chip->state == FL_ERASING, cfi_*_sync() will be busy-looping
either redundantly for a fixed interval of time (for SCHED_NORMAL tasks) or
possibly endlessly (for RT tasks and UP).

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@...il.com>

---

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index d072e87..458d477 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -1763,6 +1763,7 @@ static void cfi_amdstd_sync (struct mtd_info *mtd)
 
 		default:
 			/* Not an idle state */
+			set_current_state(TASK_UNINTERRUPTIBLE);
 			add_wait_queue(&chip->wq, &wait);
 
 			spin_unlock(chip->mutex);
diff --git a/drivers/mtd/chips/cfi_cmdset_0020.c b/drivers/mtd/chips/cfi_cmdset_0020.c
index b344ff8..492e2ab 100644
--- a/drivers/mtd/chips/cfi_cmdset_0020.c
+++ b/drivers/mtd/chips/cfi_cmdset_0020.c
@@ -1015,6 +1015,7 @@ static void cfi_staa_sync (struct mtd_info *mtd)
 
 		default:
 			/* Not an idle state */
+			set_current_state(TASK_UNINTERRUPTIBLE);
 			add_wait_queue(&chip->wq, &wait);
 
 			spin_unlock_bh(chip->mutex);


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