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Commit aabc5649 authored by Ben Hutchings's avatar Ben Hutchings Committed by David S. Miller
Browse files

sfc: Wait at most 10ms for the MC to finish reading out MAC statistics 



The original code would wait indefinitely if MAC stats DMA failed.

Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c0786693

drivers/net/sfc/siena.c

+11 −2
Original line number Diff line number Diff line
@@ -456,8 +456,17 @@ static int siena_try_update_nic_stats(struct efx_nic *efx) 


static void siena_update_nic_stats(struct efx_nic *efx)

{

	while (siena_try_update_nic_stats(efx) == -EAGAIN)

		cpu_relax();

	int retry;



	/* If we're unlucky enough to read statistics wduring the DMA, wait

	 * up to 10ms for it to finish (typically takes <500us) */

	for (retry = 0; retry < 100; ++retry) {

		if (siena_try_update_nic_stats(efx) == 0)

			return;

		udelay(100);

	}



	/* Use the old values instead */

}



static void siena_start_nic_stats(struct efx_nic *efx)