Bjorn Helgaas wrote:
Keith Owens did report an issue with the double probe, but I confess
I don't fully understand it.
heh, ok...
The real problem was that the serial driver claimed a non-serial
device. On many laptops, there's an IR device at 0x3e8, IRQ 3.
The serial driver claimed this as ttyS2, using IRQ 4. So if you
wanted to use the IR device, you had to either:
- use setserial to make the serial driver forget about ttyS2
so an IR driver could claim it, or
- use setserial to change the IRQ to 3 and just use the device
in SIR mode, which is 16550-compatible so you can use the
serial driver
I didn't express that very clearly in the changelog.
That cannot be a justification for breaking serial port probe that has
been working for 10+ years.
The VAST MAJORITY of computers, all told, have one or more serial ports
in the expected places. We must consider the majority first, then
tackle edge cases like weirdo laptops that can be detected by other means.
Now that we have established the double-probe problem as potentially
bogus, and not investigated at all, we are left with:
You changed legacy serial probing, affecting millions of computers, due
to a few machines with unusual IR configurations.
At this point the "revert! revert!" submarine alarm is sounding quite
loudly. You can fix IR without breaking legacy serial.
Jeff
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