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sfc: Assert filter_sem write locked when required

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Based on a patch by Andrew Rybchenko <Andrew.Rybchenko@oktetlabs.ru>

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2016-06-15 17:43:43 +01:00 • committed by David S. Miller
parent ebfcd0fd90
commit dd98708cf6
2 changed files with 24 additions and 1 deletions
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9
drivers/net/ethernet/sfc/efx.h
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@ -274,4 +274,13 @@ static inline void efx_device_detach_sync(struct efx_nic *efx)
netif_tx_unlock_bh(dev);
}
static inline bool efx_rwsem_assert_write_locked(struct rw_semaphore *sem)
{
if (WARN_ON(down_read_trylock(sem))) {
up_read(sem);
return false;
}
return true;
}
#endif /* EFX_EFX_H */