]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
drivers/net: fixed drivers that support netpoll use ndo_start_xmit()
authorDongdong Deng <dongdong.deng@windriver.com>
Thu, 13 Aug 2009 19:12:31 +0000 (19:12 +0000)
committerDavid S. Miller <davem@davemloft.net>
Fri, 14 Aug 2009 23:41:16 +0000 (16:41 -0700)
commit22580f894ac190c46beebb5c3172e450a2318f79
tree01f88df9a5bc27170ef7ca944ba40af578476d72
parent0527a1a8440a20b3d0fd1d0c9e75a6f38a9d5315
drivers/net: fixed drivers that support netpoll use ndo_start_xmit()

The NETPOLL API requires that interrupts remain disabled in
netpoll_send_skb(). The use of spin_lock_irq() and spin_unlock_irq()
in the NETPOLL API callbacks causes the interrupts to get enabled and
can lead to kernel instability.

The solution is to use spin_lock_irqsave() and spin_unlock_restore()
to prevent the irqs from getting enabled while in netpoll_send_skb().

Call trace:
netpoll_send_skb()
{
   -> local_irq_save(flags)
     ---> dev->ndo_start_xmit(skb, dev)
         ---> spin_lock_irq()
         ---> spin_unlock_irq() *******here would enable the interrupt.
              ...
   -> local_irq_restore(flags)
}

Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/b44.c
drivers/net/tulip/tulip_core.c
drivers/net/ucc_geth.c
drivers/net/via-rhine.c