问题
I am writing windows device driver first time for multiport serial pci card.May be this one is stupid question but i got stuck.Need someone's help.Let me first explain what I have done yet.I have bus driver which creates number of child (2/4/8/16) depends on card. Now I have to write function driver for it.The bus driver creates interrupt which I have to use.Now in my driver I got bus interface,interrupt created in bus driver and related information.I am using Serial Port Driver Sample for reference.Now in SerialISR () routine my driver got stuck in while loop.
ServicedAnInterrupt = TRUE;
do {
InterruptIdReg &= (~SERIAL_IIR_FIFOS_ENABLED);
switch (InterruptIdReg) {
case SERIAL_IIR_RLS: {
READ_LINE_STATUS(Extension, Extension->Controller);
break;
}
case SERIAL_IIR_RDA:
case SERIAL_IIR_CTI: {
READ_RECEIVE_BUFFER(Extension, Extension->Controller);
break;
}
case SERIAL_IIR_THR: {
//
// Alread clear from reading the iir.
//
// We want to keep close track of whether
// the holding register is empty.
//
Extension->HoldingEmpty = TRUE;
break;
}
case SERIAL_IIR_MS: {
READ_MODEM_STATUS(Extension, Extension->Controller);
break;
}
default: {
ASSERT(FALSE);
break;
}
}
} while (!((InterruptIdReg =
READ_INTERRUPT_ID_REG(Extension, Extension->Controller))
& SERIAL_IIR_NO_INTERRUPT_PENDING));
Every time it goes into case SERIAL_IIR_MS. This process continue for some time about 1 min & then test pc will crash.What can be the reason behind that & what should I do to overcome this problem?I have gone through msdn library information. Also read issues regarding this on OSR website.
来源：https://stackoverflow.com/questions/26713360/serial-port-driver-got-stuck-in-serialisr-routine