Date: Fri, 30 Jun 1995 12:06:11 +1000 From: Bruce Evans <bde@zeta.org.au> To: CVS-commiters@freefall.cdrom.com, ache@freefall.cdrom.com, cvs-sys@freefall.cdrom.com Subject: Re: cvs commit: src/sys/i386/isa sio.c Message-ID: <199506300206.MAA21212@godzilla.zeta.org.au>
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> Modified: sys/i386/isa sio.c > Log: > Fight with hanging modems continued: > return EIO after t_timeout expired instead infinite looping in "siotx" > in comparam, consuming CPU time. Why does this loop occur? It can't happen with working 8250..16550 chips? It might happen if the UART incompatibly implements ctsflow in hardware. Otherwise, hangs here are quite different from the ctsflow-related hangs solved elsewhere using t_timeout. Bruce
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