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Patch from Eric Norum <eric@cls.usask.ca> to remove race conditions

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when setting up receive buffer descriptors and when unmasking interrupts.
This commit is contained in:
Joel Sherrill
2000-02-08 18:26:40 +00:00
parent b33ab2b2b3
commit a9d04b1cfa
1 changed files with 9 additions and 3 deletions
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12
c/src/lib/libbsp/m68k/gen68360/network/network.c
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@@ -413,7 +413,7 @@ scc_rxDaemon (void *arg)
struct ifnet *ifp = &sc->arpcom.ac_if;
struct mbuf *m;
rtems_unsigned16 status;
m360BufferDescriptor_t *rxBd;
volatile m360BufferDescriptor_t *rxBd;
int rxBdIndex;
/*
@@ -426,11 +426,11 @@ scc_rxDaemon (void *arg)
m->m_pkthdr.rcvif = ifp;
sc->rxMbuf[rxBdIndex] = m;
rxBd->buffer = mtod (m, void *);
rxBd->status = M360_BD_EMPTY | M360_BD_INTERRUPT;
if (++rxBdIndex == sc->rxBdCount) {
rxBd->status |= M360_BD_WRAP;
rxBd->status = M360_BD_EMPTY | M360_BD_INTERRUPT | M360_BD_WRAP;
break;
}
rxBd->status = M360_BD_EMPTY | M360_BD_INTERRUPT;
}
/*
@@ -457,12 +457,15 @@ scc_rxDaemon (void *arg)
* `if' above, and the clearing of the event register.
*/
while ((status = rxBd->status) & M360_BD_EMPTY) {
rtems_interrupt_level level;
rtems_event_set events;
/*
* Unmask RXF (Full frame received) event
*/
rtems_interrupt_disable (level);
m360.scc1.sccm |= 0x8;
rtems_interrupt_enable (level);
rtems_bsdnet_event_receive (INTERRUPT_EVENT,
RTEMS_WAIT|RTEMS_EVENT_ANY,
@@ -590,13 +593,16 @@ sendpacket (struct ifnet *ifp, struct mbuf *m)
*/
m360Enet_retire_tx_bd (sc);
while ((sc->txBdActiveCount + nAdded) == sc->txBdCount) {
rtems_interrupt_level level;
rtems_event_set events;
/*
* Unmask TXB (buffer transmitted) and
* TXE (transmitter error) events.
*/
rtems_interrupt_disable (level);
m360.scc1.sccm |= 0x12;
rtems_interrupt_enable (level);
rtems_bsdnet_event_receive (INTERRUPT_EVENT,
RTEMS_WAIT|RTEMS_EVENT_ANY,
RTEMS_NO_TIMEOUT,