Hi,
The problem I am having is related to this function in 8250_core.c (based on kernel 4.9)
179 static int serial_link_irq_chain(struct uart_8250_port *up)
180 {
181 struct hlist_head *h;
182 struct hlist_node *n;
183 struct irq_info *i;
184 int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
185
I am running into genirq flags mismatch since on this line irq_flags is getting the value 0 instead of IRQF_SHARED. Forcing this value to shared fixes the conflict.
I have been trying to backtrack to find out where port.flags is set/initialized, to determine why it is not set to UPF_SHARE_IRQ
I imagine that it should be set based on kernel config option CONFIG_SERIAL_8250_SHARE_IRQ, which becomes this
53 static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
Maybe there is a default value for port.flags that should be set based on this kernel option?
I am configuring for a PCI plug in card which is being configured port&irq manually using setserial since the VENDOR/DEVICE is not in the supported list. I am using 8250 as a module and the parameter share_irqs = 1. I am not sure which initialize function is called in this case.
I'm sure I am missing something, can you please point me in the right direction?
Thanks.
J.
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