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[BNX2]: Fix bug in irq handler and add prefetch 

Fix bug in bnx2_interrupt() that caused an unnecessary register read.
The BNX2_PCICFG_MISC_STATUS should only be read when the status tag
has not changed.

Add prefetch of the status block in bnx2_msi() similar to tg3_msi().
The status block is not touched in bnx2_msi() and prefetching it will
speed up bnx2_poll() that will run on the same CPU that received the
MSI.

Update version.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2005-09-08 13:15:32 -07:00 committed by David S. Miller
parent 2e66fc4116
commit c921e4c4db
2 changed files with 5 additions and 3 deletions
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7
drivers/net/bnx2.c
View File

@ -14,8 +14,8 @@
#define DRV_MODULE_NAME "bnx2"
#define PFX DRV_MODULE_NAME ": "
#define DRV_MODULE_VERSION "1.2.20"
#define DRV_MODULE_RELDATE "August 22, 2005"
#define DRV_MODULE_VERSION "1.2.21"
#define DRV_MODULE_RELDATE "September 7, 2005"
#define RUN_AT(x) (jiffies + (x))
@ -1533,6 +1533,7 @@ bnx2_msi(int irq, void *dev_instance, struct pt_regs *regs)
struct net_device *dev = dev_instance;
struct bnx2 *bp = dev->priv;
prefetch(bp->status_blk);
REG_WR(bp, BNX2_PCICFG_INT_ACK_CMD,
BNX2_PCICFG_INT_ACK_CMD_USE_INT_HC_PARAM |
BNX2_PCICFG_INT_ACK_CMD_MASK_INT);
@ -1558,7 +1559,7 @@ bnx2_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
* When using MSI, the MSI message will always complete after
* the status block write.
*/
if ((bp->status_blk->status_idx == bp->last_status_idx) ||
if ((bp->status_blk->status_idx == bp->last_status_idx) &&
(REG_RD(bp, BNX2_PCICFG_MISC_STATUS) &
BNX2_PCICFG_MISC_STATUS_INTA_VALUE))
return IRQ_NONE;

1
drivers/net/bnx2.h
View File

@ -50,6 +50,7 @@
#endif
#include <linux/workqueue.h>
#include <linux/crc32.h>
#include <linux/prefetch.h>
/* Hardware data structures and register definitions automatically
* generated from RTL code. Do not modify.