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Return immediately in our interrupt handler if there is nothing to do.

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This allows shared interrupts to work.

Submitted by: greg@greg.rim.or.jp
This commit is contained in:
gibbs 1996-02-18 07:45:36 +00:00
parent 183bafe64f
commit ad8b686ee4
1 changed files with 7 additions and 1 deletions
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8
sys/i386/scsi/bt.c
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@ -12,7 +12,7 @@
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
* $Id: bt.c,v 1.5 1996/01/25 23:03:07 joerg Exp $
* $Id: bt.c,v 1.6 1996/02/16 17:23:56 gibbs Exp $
*/
/*
@ -70,6 +70,8 @@ struct bt_data *btdata[NBT];
#define BT_CDF 0x08 /* cmd/data out port full */
#define BT_DF 0x04 /* Data in port full */
#define BT_INVDCMD 0x01 /* Invalid command */
#define BT_STAT_MASK \
(BT_STST | BT_DIAGF | BT_INIT | BT_IDLE | BT_CDF | BT_DF | BT_INVDCMD)
#define BT_CMD_DATA_PORT (BT_BASE + 0x1) /* cmds and datas */
/* ReadOps WriteOps */
@ -557,6 +559,10 @@ bt_intr(arg)
* just return.
*/
stat = inb(BT_INTR_PORT);
if((stat & BT_STAT_MASK) == 0) {
/* Shared interrupt */
return;
}
/* Mail Box out empty ? */
if (stat & BT_MBOA) {