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xen/hvc: only notify if we actually sent something

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Don't spam dom0/xenconsoled with events unless we've actually added
something to the ring.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2010-10-14 11:38:47 -07:00
parent 3654581e47
commit 403a85ff00
1 changed files with 2 additions and 1 deletions
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3
drivers/char/hvc_xen.c
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@ -74,7 +74,8 @@ static int __write_console(const char *data, int len)
wmb(); /* write ring before updating pointer */
intf->out_prod = prod;
notify_daemon();
if (sent)
notify_daemon();
return sent;
}