speakup_ltlk bug
John Heim
jheim at math.wisc.edu
Tue Feb 7 17:22:08 EST 2012
I traced the bug in the speakup_ltlk module to a line in serialio.c in the
spk_serial_init function. There is a line that calls __release_region and
that is generating an error message in the system log, "Trying to free
non-existent resource". Below are lines from my system log. I cut the date
& hostname out of the lines so they'd be easier to listen to.
kernel: [ 2868.171658] speakup_ltlk: module is from the staging directory,
the quality is unknown, you have been warned.
kernel: [ 2868.171766] synth probe
kernel: [ 2868.171771] Ports not available, trying to steal them
kernel: [ 2868.171774] Trying to free nonexistent resource
<00000000000003f8-00000000000003ff>
kernel: [ 2868.171777] Unable to allocate port at 3f8, errno -16
kernel: [ 2868.171778] LiteTalk: not found
kernel: [ 2868.171779] ltlk: device probe failed
That s__release_region function appears to be a linux kernel function so I
doubt the bug is there. It must be getting passed bad parameters. But 3f8 is
the correct address of ttyS0. So I'm not sure what's wrong.
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