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netpoll: Fix carrier detection for drivers that are using phylib 

Using early netconsole and gianfar driver this error pops up:

  netconsole: timeout waiting for carrier

It appears that net/core/netpoll.c:netpoll_setup() is using
cond_resched() in a loop waiting for a carrier.

The thing is that cond_resched() is a no-op when system_state !=
SYSTEM_RUNNING, and so drivers/net/phy/phy.c's state_queue is never
scheduled, therefore link detection doesn't work.

I belive that the main problem is in cond_resched()[1], but despite
how the cond_resched() story ends, it might be a good idea to call
msleep(1) instead of cond_resched(), as suggested by Andrew Morton.

[1] http://lkml.org/lkml/2009/7/7/463

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Anton Vorontsov 2009-07-08 20:09:44 -07:00 committed by David S. Miller
parent d2daeabf62
commit 1b614fb9a0
1 changed files with 1 additions and 1 deletions
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2
net/core/netpoll.c
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@ -740,7 +740,7 @@ int netpoll_setup(struct netpoll *np)
np->name);
break;
}
cond_resched();
msleep(1);
}
/* If carrier appears to come up instantly, we don't