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sfc: Serialise tenxpress_special_reset() with statistics fetches

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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 <shodgson@solarflare.com>
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Ben Hutchings 2008-09-01 12:49:25 +01:00 committed by Jeff Garzik
parent ef08af03ef
commit c8fcc49c54
1 changed files with 10 additions and 5 deletions
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15
drivers/net/sfc/tenxpress.c
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@ -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)