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Commit c921e4c4 authored by Michael Chan's avatar Michael Chan Committed by David S. Miller
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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: default avatarMichael Chan <mchan@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2e66fc41

drivers/net/bnx2.c

+4 −3
Original line number Diff line number Diff line
@@ -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;

drivers/net/bnx2.h

+1 −0
Original line number Diff line number Diff line
@@ -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.