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linux/drivers/net/xen-netback
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David Vrabel 0d08fceb2e xen-netback: fix race between napi_complete() and interrupt handler 
When the NAPI budget was not all used, xenvif_poll() would call
napi_complete() /after/ enabling the interrupt.  This resulted in a
race between the napi_complete() and the napi_schedule() in the
interrupt handler.  The use of local_irq_save/restore() avoided by
race iff the handler is running on the same CPU but not if it was
running on a different CPU.

Fix this properly by calling napi_complete() before reenabling
interrupts (in the xenvif_napi_schedule_or_enable_irq() call).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-05-16 16:27:23 -04:00
..
common.h xen-netback: fix race between napi_complete() and interrupt handler 2014-05-16 16:27:23 -04:00
interface.c xen-netback: fix race between napi_complete() and interrupt handler 2014-05-16 16:27:23 -04:00
Makefile
netback.c xen-netback: fix race between napi_complete() and interrupt handler 2014-05-16 16:27:23 -04:00
xenbus.c drivers/net/*: Fix FSF address in file headers 2013-12-06 12:37:55 -05:00