linux-kernel - [ 115/123] revert "rtc: recycle id when unloading a rtc driver"

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Message-Id: <20130109201513.147383741@linuxfoundation.org>
Date:	Wed,  9 Jan 2013 12:35:54 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Lothar Waßmann <LW@...O-electronics.de>,
	Alexander Holler <holler@...oftware.de>,
	Vincent Palatin <vpalatin@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 115/123] revert "rtc: recycle id when unloading a rtc driver"

3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrew Morton <akpm@...ux-foundation.org>

commit 5abe257af8b95857b95fa0ba694530b446ae32d8 upstream.

Revert commit 2830a6d20139df2198d63235df7957712adb28e5.

We already perform the ida_simple_remove() in rtc_device_release(),
which is an appropriate place.  Commit 2830a6d20 ("rtc: recycle id when
unloading a rtc driver") caused the kernel to emit

	ida_remove called for id=0 which is not allocated.

warnings when rtc_device_release() tries to release an alread-released
ID.

Let's restore things to their previous state and then work out why
Vincent's kernel wasn't calling rtc_device_release() - presumably a bug
in a specific sub-driver.

Reported-by: Lothar Waßmann <LW@...O-electronics.de>
Acked-by: Alexander Holler <holler@...oftware.de>
Cc: Vincent Palatin <vpalatin@...omium.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/rtc/class.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -244,7 +244,6 @@ void rtc_device_unregister(struct rtc_de
 		rtc_proc_del_device(rtc);
 		device_unregister(&rtc->dev);
 		rtc->ops = NULL;
-		ida_simple_remove(&rtc_ida, rtc->id);
 		mutex_unlock(&rtc->ops_lock);
 		put_device(&rtc->dev);
 	}


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