From: Alexander Aring <alex.aring@gmail.com>
To: Peter Hurley <peter@hurleysoftware.com>
Cc: Jukka Rissanen <jukka.rissanen@linux.intel.com>,
linux-bluetooth@vger.kernel.org
Subject: Re: [PATCH] Bluetooth: Incorrect locking when sending data in softirq
Date: Wed, 15 Oct 2014 23:53:27 +0200 [thread overview]
Message-ID: <20141015215324.GB17138@omega> (raw)
In-Reply-To: <543EDD20.8050508@hurleysoftware.com>
Hi Peter,
On Wed, Oct 15, 2014 at 04:46:24PM -0400, Peter Hurley wrote:
...
>
> That's happening because 6lowpan.c:send_mcast_pkt() is disabling
> interrupts with the read_lock_irqsave() before calling send_pkt().
>
> It's unclear browsing through the lowpan driver why the
> irqflags save/restore read_lock flavors are being used; is there a
> place where the bluetooth core is calling the driver in atomic
> context (ie., where interrupts are disabled)?
>
In my opinion bt_xmit is called in atomic context. Make the stacktrace
sense now?
It's the callback 'ndo_start_xmit' of 'struct net_device_ops' [0].
- Alex
[0] http://lxr.free-electrons.com/source/include/linux/netdevice.h#L1001
next prev parent reply other threads:[~2014-10-15 21:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-15 12:43 [PATCH] Bluetooth: Incorrect locking when sending data in softirq Jukka Rissanen
2014-10-15 13:18 ` Peter Hurley
2014-10-15 13:32 ` Jukka Rissanen
2014-10-15 20:46 ` Peter Hurley
2014-10-15 21:53 ` Alexander Aring [this message]
2014-10-15 21:58 ` Peter Hurley
2014-10-15 22:23 ` Alexander Aring
2014-10-16 1:20 ` Peter Hurley
2014-10-16 7:47 ` Jukka Rissanen
2014-10-15 13:36 ` Alexander Aring
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