diff options
author | Dongdong Deng <dongdong.deng@windriver.com> | 2009-08-13 15:12:31 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-08-14 19:41:16 -0400 |
commit | 22580f894ac190c46beebb5c3172e450a2318f79 (patch) | |
tree | 01f88df9a5bc27170ef7ca944ba40af578476d72 /kernel/sys.c | |
parent | 0527a1a8440a20b3d0fd1d0c9e75a6f38a9d5315 (diff) |
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>
Diffstat (limited to 'kernel/sys.c')
0 files changed, 0 insertions, 0 deletions