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Changing MTU size of an xgmac network interface while it is active can cause a panic like skbuff: skb_over_panic: text:c03bc62c len:1090 put:1090 head:edfb6900 data:edfb6942 tail:0xedfb6d84 end:0xedfb6bc0 dev:eth0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:126! Internal error: Oops - BUG: 0 [#1] SMP ARM Modules linked in: CPU: 0 PID: 762 Comm: python Tainted: G W 3.10.0-00015-g3e33cd7 #309 task: edcfe000 ti: ed67e000 task.ti: ed67e000 PC is at skb_panic+0x64/0x70 LR is at wake_up_klogd+0x5c/0x68 This happens because xgmac_change_mtu modifies dev->mtu before the network interface is quiesced. And thus there still might be buffers in use which have a buffer size based on the old MTU. To fix this I moved the change of dev->mtu after the call to xgmac_stop. Another modification is required (in xgmac_stop) to ensure that xgmac_xmit is really not called anymore (xgmac_tx_complete might wake up the queue again). I've tested the fix by switching MTU size every second between 600 and 1500 while network traffic was going on. The test box survived a test of several hours (until I've stopped it) whereas w/o this fix above panic occurs after several minutes (at most). Change since v1: - remove call to netif_stop_queue at beginning of xgmac_stop - use netif_tx_disable instead of locking+netif_stop_queue Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| Kconfig | ||
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| xgmac.c | ||