Handle the corner case where budget is exhausted correctly.
And save unnecessary read of index register.
Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]>
--- a/drivers/net/sky2.c 2007-10-11 18:26:56.000000000 -0700
+++ b/drivers/net/sky2.c 2007-10-11 18:27:12.000000000 -0700
@@ -2245,15 +2245,13 @@ static inline void sky2_tx_done(struct n
}
/* Process status response ring */
-static int sky2_status_intr(struct sky2_hw *hw, int to_do)
+static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
{
int work_done = 0;
unsigned rx[2] = { 0, 0 };
- u16 hwidx = sky2_read16(hw, STAT_PUT_IDX);
rmb();
-
- while (hw->st_idx != hwidx) {
+ do {
struct sky2_port *sky2;
struct sky2_status_le *le = hw->st_le + hw->st_idx;
unsigned port = le->css & CSS_LINK_BIT;
@@ -2364,7 +2362,7 @@ static int sky2_status_intr(struct sky2_
printk(KERN_WARNING PFX
"unknown status opcode 0x%x\n",
le->opcode);
}
- }
+ } while (hw->st_idx != idx);
/* Fully processed status ring so clear irq */
sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
@@ -2607,6 +2605,7 @@ static int sky2_poll(struct napi_struct
struct sky2_hw *hw = container_of(napi, struct sky2_hw, napi);
u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
int work_done = 0;
+ u16 idx;
if (unlikely(status & Y2_IS_ERROR))
sky2_err_intr(hw, status);
@@ -2617,29 +2616,23 @@ static int sky2_poll(struct napi_struct
if (status & Y2_IS_IRQ_PHY2)
sky2_phy_intr(hw, 1);
- for(;;) {
- work_done += sky2_status_intr(hw, work_limit);
+ while ((idx = sky2_read16(hw, STAT_PUT_IDX)) != hw->st_idx) {
+ work_done += sky2_status_intr(hw, work_limit - work_done, idx);
if (work_done >= work_limit)
- break;
-
- /* More work? */
- if (hw->st_idx != sky2_read16(hw, STAT_PUT_IDX))
- continue;
-
- /* Bug/Errata workaround?
- * Need to kick the TX irq moderation timer.
- */
- if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
- sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
- sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
- }
-
- napi_complete(napi);
- sky2_read32(hw, B0_Y2_SP_LISR);
- break;
+ goto done;
+ }
+ /* Bug/Errata workaround?
+ * Need to kick the TX irq moderation timer.
+ */
+ if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
+ sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
+ sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
}
+ napi_complete(napi);
+ sky2_read32(hw, B0_Y2_SP_LISR);
+done:
return work_done;
}
-
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