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authorBruce Allan <bruce.w.allan@intel.com>2011-05-13 07:19:53 +0000
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-06-09 20:32:28 -0700
commitc5caf4825b22957e4ad70fd94316e91ce8cfb51c (patch)
treecdd685b91226fc8ca16bc3d9278dba3e39d88662 /drivers/net/e1000e
parent99730e4c13c8344b02dd96108945b48d28c14c25 (diff)
e1000e: log when swflag is cleared unexpectedly on ICH/PCH devices
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 <bruce.w.allan@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/e1000e')
-rw-r--r--drivers/net/e1000e/ich8lan.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index dcd5db5e34e5..dddd0b3dd21b 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);