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authordave graham <david.graham@intel.com>2009-02-14 23:46:10 -0800
committerDavid S. Miller <davem@davemloft.net>2009-02-14 23:46:10 -0800
commit0a834a36ac92375cd82d9e4fe4f571e257997d6a (patch)
tree5c9ffb2dafe2aa7f26b68d16d2ec3eb93311a38a /drivers/net/e1000e
parent5e30589521518bff36fd2638b3c3d69679c50436 (diff)
e1000e: Remove mutex_trylock and associated WARN on failure.
Single-thread access must be ensured for ICH8 NVM and PHY operations. This synchronization is provided by the nvm_mutex. To assist in understanding the contexts from which this code could be reached, a WARN was output if the mutex was not going to be immediately acquirable (if !mutex_trylock()). The code has now been optimized, and we have verified that the few remaining mutex contentions are reasonable and non-blocking, and it is time to remove the mutex_trylock() and WARN messages. Signed-off-by: dave graham <david.graham@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/e1000e')
-rw-r--r--drivers/net/e1000e/ich8lan.c17
1 files changed, 1 insertions, 16 deletions
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index e415e81ecd3e..6d1aab6316ba 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -390,8 +390,6 @@ static s32 e1000_get_variants_ich8lan(struct e1000_adapter *adapter)
}
static DEFINE_MUTEX(nvm_mutex);
-static pid_t nvm_owner_pid = -1;
-static char nvm_owner_name[TASK_COMM_LEN] = "";
/**
* e1000_acquire_swflag_ich8lan - Acquire software control flag
@@ -408,16 +406,7 @@ static s32 e1000_acquire_swflag_ich8lan(struct e1000_hw *hw)
might_sleep();
- if (!mutex_trylock(&nvm_mutex)) {
- WARN(1, KERN_ERR "e1000e mutex contention. Owned by process "
- "%s (pid %d), required by process %s (pid %d)\n",
- nvm_owner_name, nvm_owner_pid,
- current->comm, current->pid);
-
- mutex_lock(&nvm_mutex);
- }
- nvm_owner_pid = current->pid;
- strncpy(nvm_owner_name, current->comm, TASK_COMM_LEN);
+ mutex_lock(&nvm_mutex);
while (timeout) {
extcnf_ctrl = er32(EXTCNF_CTRL);
@@ -435,8 +424,6 @@ static s32 e1000_acquire_swflag_ich8lan(struct e1000_hw *hw)
hw_dbg(hw, "FW or HW has locked the resource for too long.\n");
extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
ew32(EXTCNF_CTRL, extcnf_ctrl);
- nvm_owner_pid = -1;
- strcpy(nvm_owner_name, "");
mutex_unlock(&nvm_mutex);
return -E1000_ERR_CONFIG;
}
@@ -460,8 +447,6 @@ static void e1000_release_swflag_ich8lan(struct e1000_hw *hw)
extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
ew32(EXTCNF_CTRL, extcnf_ctrl);
- nvm_owner_pid = -1;
- strcpy(nvm_owner_name, "");
mutex_unlock(&nvm_mutex);
}