[net-next 03/40] e1000e: log when swflag is cleared unexpectedly on ICH/PCH devices
From: Jeff Kirsher <hidden>
Date: 2011-06-07 12:33:20
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Bruce Allan <redacted> Since EXTCNF_CTRL.SWFLAG (used in the ownership arbitration of shared resources, e.g. the PHY shared between the s/w, f/w, and h/w clients) can be cleared by any of those clients, log a debug message when software attempts to clear it and it is already cleared unexpectedly. And since the swflag is cleared by a hardware reset, the driver does not need to do that, but the mutex acquired when the bit is set must still be cleared. Signed-off-by: Bruce Allan <redacted> Tested-by: Aaron Brown <redacted> Signed-off-by: Jeff Kirsher <redacted> --- drivers/net/e1000e/ich8lan.c | 11 ++++++++--- 1 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index dcd5db5..dddd0b3 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c@@ -889,8 +889,13 @@ static void e1000_release_swflag_ich8lan(struct e1000_hw *hw) u32 extcnf_ctrl; extcnf_ctrl = er32(EXTCNF_CTRL); - extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG; - ew32(EXTCNF_CTRL, extcnf_ctrl); + + if (extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG) { + extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG; + ew32(EXTCNF_CTRL, extcnf_ctrl); + } else { + e_dbg("Semaphore unexpectedly released by sw/fw/hw\n"); + } mutex_unlock(&swflag_mutex); }
@@ -3066,7 +3071,7 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw) msleep(20); if (!ret_val) - e1000_release_swflag_ich8lan(hw); + mutex_unlock(&swflag_mutex); if (ctrl & E1000_CTRL_PHY_RST) { ret_val = hw->phy.ops.get_cfg_done(hw);
--
1.7.5.2