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e1000e: debug contention on NVM SWFLAG

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This patch adds a mutex to the e1000e driver that would help
catch any collisions of two e1000e threads accessing hardware
at the same time.

description and patch updated by Jesse

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2008-10-02 16:33:40 -07:00 committed by Linus Torvalds
parent 4fa7553a07
commit 717d438d1f
1 changed files with 17 additions and 0 deletions
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17
drivers/net/e1000e/ich8lan.c
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@ -380,6 +380,9 @@ static s32 e1000_get_variants_ich8lan(struct e1000_adapter *adapter)
return 0;
}
static DEFINE_MUTEX(nvm_mutex);
static pid_t nvm_owner = -1;
/**
* e1000_acquire_swflag_ich8lan - Acquire software control flag
* @hw: pointer to the HW structure
@ -393,6 +396,15 @@ static s32 e1000_acquire_swflag_ich8lan(struct e1000_hw *hw)
u32 extcnf_ctrl;
u32 timeout = PHY_CFG_TIMEOUT;
WARN_ON(preempt_count());
if (!mutex_trylock(&nvm_mutex)) {
WARN(1, KERN_ERR "e1000e mutex contention. Owned by pid %d\n",
nvm_owner);
mutex_lock(&nvm_mutex);
}
nvm_owner = current->pid;
while (timeout) {
extcnf_ctrl = er32(EXTCNF_CTRL);
extcnf_ctrl |= E1000_EXTCNF_CTRL_SWFLAG;
@ -407,6 +419,8 @@ static s32 e1000_acquire_swflag_ich8lan(struct e1000_hw *hw)
if (!timeout) {
hw_dbg(hw, "FW or HW has locked the resource for too long.\n");
nvm_owner = -1;
mutex_unlock(&nvm_mutex);
return -E1000_ERR_CONFIG;
}
@ -428,6 +442,9 @@ static void e1000_release_swflag_ich8lan(struct e1000_hw *hw)
extcnf_ctrl = er32(EXTCNF_CTRL);
extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
ew32(EXTCNF_CTRL, extcnf_ctrl);
nvm_owner = -1;
mutex_unlock(&nvm_mutex);
}
/**