Date: Wed, 29 Sep 2004 05:17:26 +0000 (UTC) From: Warner Losh <imp@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/dev/fdc fdc_isa.c Message-ID: <200409290517.i8T5HRlm044009@repoman.freebsd.org>
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imp 2004-09-29 05:17:26 UTC FreeBSD src repository Modified files: (Branch: RELENG_5) sys/dev/fdc fdc_isa.c Log: MFC: Merge case 8 into the resource allocation from 1.15: >>revision 1.15 >>date: 2004/09/20 06:12:19; author: imp; state: Exp; lines: +14 -4 >>das@ has a ACPI bios that lists 0x3f0-0x3f1, 0x3f2-0x3f3, 0x3f4-0x3f5 >>and 0x3f7. fdc_isa_alloc_resource() didn't work right in this case >>(it accessed FDOUT correctly due to an overflow of the first resource. >>It accesed FDSTS and FDDATA incorrectly via the second resource (which >>wound up accessing FDOUT and the tape register at 0x3f3) and badly for >>the CTL register (at location 0x3f4). This is a minimal fix that just >>'eats' the first one if it covers two locations and has an offset of >>0. This confusion lead the floppy driver to think there'd been a disk >>change, which uncovered a deadlock in the floppy/geom code which lead >>to a panic. These changes fix that by fixing the underlying resource >>problem, but doesn't address the potential deadlock issue that might >>still be there. >> >>This is a minimal fix so it can more safely be merged into 5 w/o risk >>for known working configurations (hence the use of the ugly goto, >>which reduces case 8 to case 6 w/o affecting cases 1-7). A more >>invasive fix that will handle more ACPI resource list diversity is in >>the pipeline that should kill these issues once and for all, while >>staying within the resources that we allocate. >> >>Tested/Reported by: das >>Reviewed by: njl >>MFC before: re->next_release_name(5.3-BETA5); If you get floppy hangs on boot, please try after this patch and let me know if they are solved. Approved by: re@ (scottl) Revision Changes Path 1.9.2.3 +14 -4 src/sys/dev/fdc/fdc_isa.c
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