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List:       linux-netdev
Subject:    Re: [PATCH net] at86rf230: mask irq's before deregister device
From:       David Miller <davem () davemloft ! net>
Date:       2014-03-31 20:43:34
Message-ID: 20140331.164334.791905030722014681.davem () davemloft ! net
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From: Alexander Aring <alex.aring@gmail.com>
Date: Mon, 31 Mar 2014 03:26:51 +0200

> While transmit over a at86rf231 device and unloading the module I got:
> 
> [   29.643073] WARNING: CPU: 0 PID: 3 at kernel/workqueue.c:1335 \
> __queue_work+0xb4/0x224() [   29.651457] Modules linked in: at86rf230(-) autofs4
> [   29.656612] CPU: 0 PID: 3 Comm: ksoftirqd/0 Tainted: G        W    \
> 3.14.0-rc6-01602-g902659e-dirty #294 [   29.666490] [<c00124f0>] (unwind_backtrace) \
> from [<c0010ad0>] (show_stack+0x10/0x14) [   29.674628] [<c0010ad0>] (show_stack) \
> from [<c0032c80>] (warn_slowpath_common+0x60/0x80) [   29.683116] [<c0032c80>] \
> (warn_slowpath_common) from [<c0032d30>] (warn_slowpath_null+0x18/0x20) [   \
> 29.692329] [<c0032d30>] (warn_slowpath_null) from [<c0045b08>] \
> (__queue_work+0xb4/0x224) [   29.700906] [<c0045b08>] (__queue_work) from \
> [<c0045cc8>] (queue_work_on+0x50/0x78) [   29.708944] [<c0045cc8>] (queue_work_on) \
> from [<c05669cc>] (mac802154_tx+0x1e4/0x240) [   29.717164] [<c05669cc>] \
> (mac802154_tx) from [<c0471814>] (dev_hard_start_xmit+0x2f0/0x43c) [   29.725926] \
> [<c0471814>] (dev_hard_start_xmit) from [<c04878d0>] (sch_direct_xmit+0x64/0x2a0) [ \
> 29.734867] [<c04878d0>] (sch_direct_xmit) from [<c0487c38>] \
> (__qdisc_run+0x12c/0x18c) [   29.743169] [<c0487c38>] (__qdisc_run) from \
> [<c046e1b0>] (net_tx_action+0xe0/0x178) [   29.751205] [<c046e1b0>] (net_tx_action) \
> from [<c0036690>] (__do_softirq+0x100/0x264) [   29.759420] [<c0036690>] \
> (__do_softirq) from [<c0036818>] (run_ksoftirqd+0x24/0x4c) [   29.767453] \
> [<c0036818>] (run_ksoftirqd) from [<c005232c>] (smpboot_thread_fn+0x128/0x13c) [   \
> 29.776121] [<c005232c>] (smpboot_thread_fn) from [<c004c3fc>] (kthread+0xd0/0xe4) [ \
> 29.784061] [<c004c3fc>] (kthread) from [<c000da88>] (ret_from_fork+0x14/0x2c) [   \
> 29.791628] ---[ end trace 3406ff24bd973834 ]--- 
> The problem is there are still interrupts after deregister ieee802154
> device. This patch mask all interrupts in the at86rf2xx chips before
> deregister the device.
> 
> Signed-off-by: Alexander Aring <alex.aring@gmail.com>

Applied, thanks.
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