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Add a check in the interrupt service routine to return quickly in

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case there is nothing to do. This happens normally when the card shares
the interrupt line with other devices.

This code saves a couple of microseconds per interrupt even on a
fast CPU. You normally would not care, except under heavy tinygram
traffic where you can have some 50-100.000 interrupts per second...

On passing, correct a spelling error.
This commit is contained in:
Luigi Rizzo 2001-02-18 07:21:28 +00:00
parent c1b843c774
commit d88a358c86
2 changed files with 8 additions and 2 deletions
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5
sys/dev/dc/if_dc.c
View File

@ -2716,7 +2716,10 @@ static void dc_intr(arg)
DC_LOCK(sc);
ifp = &sc->arpcom.ac_if;
/* Supress unwanted interrupts */
if ( (CSR_READ_4(sc, DC_ISR) & DC_INTRS) == 0)
return ;
/* Suppress unwanted interrupts */
if (!(ifp->if_flags & IFF_UP)) {
if (CSR_READ_4(sc, DC_ISR) & DC_INTRS)
dc_stop(sc);

5
sys/pci/if_dc.c
View File

@ -2716,7 +2716,10 @@ static void dc_intr(arg)
DC_LOCK(sc);
ifp = &sc->arpcom.ac_if;
/* Supress unwanted interrupts */
if ( (CSR_READ_4(sc, DC_ISR) & DC_INTRS) == 0)
return ;
/* Suppress unwanted interrupts */
if (!(ifp->if_flags & IFF_UP)) {
if (CSR_READ_4(sc, DC_ISR) & DC_INTRS)
dc_stop(sc);