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e1000e: remove phy read from inside spinlock 

thanks to tglx, we're finding some interesting reentrancy issues.
this patch removes the phy read from inside a spinlock, paving
the way for removing the spinlock completely.  The phy read was
only feeding a statistic that wasn't used.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jesse Brandeburg 2008-10-02 16:33:30 -07:00 committed by Linus Torvalds
parent a8f88ff5a5
commit 23033fad5b
2 changed files with 5 additions and 14 deletions
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6
drivers/net/e1000e/ethtool.c
View File

@ -432,6 +432,10 @@ static void e1000_get_regs(struct net_device *netdev,
regs_buff[11] = er32(TIDV);
regs_buff[12] = adapter->hw.phy.type; /* PHY type (IGP=1, M88=0) */
/* ethtool doesn't use anything past this point, so all this
* code is likely legacy junk for apps that may or may not
* exist */
if (hw->phy.type == e1000_phy_m88) {
e1e_rphy(hw, M88E1000_PHY_SPEC_STATUS, &phy_data);
regs_buff[13] = (u32)phy_data; /* cable length */
@ -447,7 +451,7 @@ static void e1000_get_regs(struct net_device *netdev,
regs_buff[22] = adapter->phy_stats.receive_errors;
regs_buff[23] = regs_buff[13]; /* mdix mode */
}
regs_buff[21] = adapter->phy_stats.idle_errors; /* phy idle errors */
regs_buff[21] = 0; /* was idle_errors */
e1e_rphy(hw, PHY_1000T_STATUS, &phy_data);
regs_buff[24] = (u32)phy_data; /* phy local receiver status */
regs_buff[25] = regs_buff[24]; /* phy remote receiver status */

13
drivers/net/e1000e/netdev.c
View File

@ -2954,9 +2954,6 @@ void e1000e_update_stats(struct e1000_adapter *adapter)
struct e1000_hw *hw = &adapter->hw;
struct pci_dev *pdev = adapter->pdev;
unsigned long irq_flags;
u16 phy_tmp;
#define PHY_IDLE_ERROR_COUNT_MASK 0x00FF
/*
* Prevent stats update while adapter is being reset, or if the pci
@ -3045,15 +3042,6 @@ void e1000e_update_stats(struct e1000_adapter *adapter)
/* Tx Dropped needs to be maintained elsewhere */
/* Phy Stats */
if (hw->phy.media_type == e1000_media_type_copper) {
if ((adapter->link_speed == SPEED_1000) &&
(!e1e_rphy(hw, PHY_1000T_STATUS, &phy_tmp))) {
phy_tmp &= PHY_IDLE_ERROR_COUNT_MASK;
adapter->phy_stats.idle_errors += phy_tmp;
}
}
/* Management Stats */
adapter->stats.mgptc += er32(MGTPTC);
adapter->stats.mgprc += er32(MGTPRC);
@ -3073,7 +3061,6 @@ static void e1000_phy_read_status(struct e1000_adapter *adapter)
int ret_val;
unsigned long irq_flags;
spin_lock_irqsave(&adapter->stats_lock, irq_flags);
if ((er32(STATUS) & E1000_STATUS_LU) &&