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ptp_clock: future-proofing drivers against PTP subsystem becoming optional

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Drivers must be ready to accept NULL from ptp_clock_register() if the
PTP clock subsystem is configured out.

This patch documents that and ensures that all drivers cope well
with a NULL return.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Eugenia Emantayev <eugenia@mellanox.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Pitre
2016-09-20 19:25:58 -04:00
committed by David S. Miller
parent d270f76c2d
commit efee95f42b
9 changed files with 19 additions and 14 deletions
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2
drivers/net/ethernet/intel/e1000e/ptp.c
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@@ -334,7 +334,7 @@ void e1000e_ptp_init(struct e1000_adapter *adapter)
if (IS_ERR(adapter->ptp_clock)) {
adapter->ptp_clock = NULL;
e_err("ptp_clock_register failed\n");
} else {
} else if (adapter->ptp_clock) {
e_info("registered PHC clock\n");
}
}