From c8fcc49c542a2312c706ebf76dcfe5266b39ee13 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Mon, 1 Sep 2008 12:49:25 +0100 Subject: sfc: Serialise tenxpress_special_reset() with statistics fetches On some boards 10Xpress feeds a 156 MHz clock to the Falcon XMAC. MAC statistics DMA can fail while this clock is stopped during a PHY reset. From: Steve Hodgson Signed-off-by: Ben Hutchings Signed-off-by: Jeff Garzik --- drivers/net/sfc/tenxpress.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/net/sfc/tenxpress.c b/drivers/net/sfc/tenxpress.c index 77e7f3a94b25..2ad3d8d12f42 100644 --- a/drivers/net/sfc/tenxpress.c +++ b/drivers/net/sfc/tenxpress.c @@ -214,7 +214,10 @@ static int tenxpress_special_reset(struct efx_nic *efx) { int rc, reg; - EFX_TRACE(efx, "%s\n", __func__); + /* The XGMAC clock is driven from the SFC7101/SFT9001 312MHz clock, so + * a special software reset can glitch the XGMAC sufficiently for stats + * requests to fail. Since we don't ofen special_reset, just lock. */ + spin_lock(&efx->stats_lock); /* Initiate reset */ reg = mdio_clause45_read(efx, efx->mii.phy_id, @@ -223,20 +226,22 @@ static int tenxpress_special_reset(struct efx_nic *efx) mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD, PMA_PMD_EXT_CTRL_REG, reg); - msleep(200); + mdelay(200); /* Wait for the blocks to come out of reset */ rc = mdio_clause45_wait_reset_mmds(efx, TENXPRESS_REQUIRED_DEVS); if (rc < 0) - return rc; + goto unlock; /* Try and reconfigure the device */ rc = tenxpress_init(efx); if (rc < 0) - return rc; + goto unlock; - return 0; +unlock: + spin_unlock(&efx->stats_lock); + return rc; } static void tenxpress_set_bad_lp(struct efx_nic *efx, bool bad_lp) -- cgit v1.2.3-55-g7522