linux-kernel - Re: [PATCH] Release device_hotplug_lock when store_mem

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Date:	Fri, 11 Oct 2013 10:31:20 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	sjenning@...ux.vnet.ibm.com, gregkh@...uxfoundation.org
Subject: Re: [PATCH] Release device_hotplug_lock when store_mem_state
 returns EINVAL

On Fri, 2013-10-11 at 15:36 +0900, Yasuaki Ishimatsu wrote:
> When inserting a wrong value to /sys/devices/system/memory/memoryX/state file,
> following messages are shown. And device_hotplug_lock is never released.
> 
> ================================================
> [ BUG: lock held when returning to user space! ]
> 3.12.0-rc4-debug+ #3 Tainted: G        W
> ------------------------------------------------
> bash/6442 is leaving the kernel with locks still held!
> 1 lock held by bash/6442:
>  #0:  (device_hotplug_lock){+.+.+.}, at: [<ffffffff8146cbb5>] lock_device_hotplug_sysfs+0x15/0x50
> 
> This issue was introdued by commit fa2be40 (drivers: base: use standard
> device online/offline for state change).
> 
> This patch releases device_hotplug_lcok when store_mem_state returns EINVAL.
> 
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> CC: Toshi Kani <toshi.kani@...com>
> CC: Seth Jennings <sjenning@...ux.vnet.ibm.com>
> CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Good catch!

Reviewed-by: Toshi Kani <toshi.kani@...com>

Thanks,
-Toshi

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