From ed79bab847d8e5a2986d8ff43c49c6fb8ee3265f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 14 Oct 2009 14:36:43 +0000 Subject: [PATCH] virtio_net: use dev_kfree_skb_any() in free_old_xmit_skbs() Because netpoll can call netdevice start_xmit() method with irqs disabled, drivers should not call kfree_skb() from their start_xmit(), but use dev_kfree_skb_any() instead. Oct 8 11:16:52 172.30.1.31 [113074.791813] ------------[ cut here ]------------ Oct 8 11:16:52 172.30.1.31 [113074.791813] WARNING: at net/core/skbuff.c:398 \ skb_release_head_state+0x64/0xc8() Oct 8 11:16:52 172.30.1.31 [113074.791813] Hardware name: Oct 8 11:16:52 172.30.1.31 [113074.791813] Modules linked in: netconsole ocfs2 jbd2 quota_tree \ ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs crc32c drbd cn loop \ serio_raw psmouse snd_pcm snd_timer snd soundcore snd_page_alloc virtio_net pcspkr parport_pc parport \ i2c_piix4 i2c_core button processor evdev ext3 jbd mbcache dm_mirror dm_region_hash dm_log dm_snapshot \ dm_mod ide_cd_mod cdrom ata_generic ata_piix virtio_blk libata scsi_mod piix ide_pci_generic ide_core \ virtio_pci virtio_ring virtio floppy thermal fan thermal_sys [last unloaded: netconsole] Oct 8 11:16:52 172.30.1.31 [113074.791813] Pid: 11132, comm: php5-cgi Tainted: G W \ 2.6.31.2-vserver #1 Oct 8 11:16:52 172.30.1.31 [113074.791813] Call Trace: Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? \ skb_release_head_state+0x64/0xc8 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? skb_release_head_state+0x64/0xc8 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? warn_slowpath_common+0x77/0xa3 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? skb_release_head_state+0x64/0xc8 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? __kfree_skb+0x9/0x7d Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? free_old_xmit_skbs+0x51/0x6e \ [virtio_net] Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? start_xmit+0x26/0xf2 [virtio_net] Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? netpoll_send_skb+0xd2/0x205 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? write_msg+0x90/0xeb [netconsole] Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? __call_console_drivers+0x5e/0x6f Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? kvm_clock_read+0x4d/0x52 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? release_console_sem+0x115/0x1ba Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? vprintk+0x2f2/0x34b Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? vx_update_load+0x18/0x13e Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? printk+0x4e/0x5d Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? kvm_clock_read+0x4d/0x52 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? getnstimeofday+0x55/0xaf Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? ktime_get_ts+0x21/0x49 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? ktime_get+0xc/0x41 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? hrtimer_interrupt+0x9c/0x146 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? smp_apic_timer_interrupt+0x80/0x93 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? apic_timer_interrupt+0x13/0x20 Oct 8 11:16:52 172.30.1.31 [113074.791813] [] ? _spin_unlock_irq+0xd/0x31 Reported-and-tested-by: Massimo Cetra Signed-off-by: Eric Dumazet Bug-Entry: http://bugzilla.kernel.org/show_bug.cgi?id=14378 Signed-off-by: David S. Miller --- drivers/net/virtio_net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 8d009760277c..54bf0912b737 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -454,7 +454,7 @@ static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) vi->dev->stats.tx_bytes += skb->len; vi->dev->stats.tx_packets++; tot_sgs += skb_vnet_hdr(skb)->num_sg; - kfree_skb(skb); + dev_kfree_skb_any(skb); } return tot_sgs; } -- 2.20.1