Module Name: src Committed By: bouyer Date: Sun Jan 16 13:06:49 UTC 2011
Modified Files: src/sys/dev/ic [netbsd-5]: ahcisata_core.c Log Message: Pull up following revision(s) (requested by tsutsui in ticket #1530): sys/dev/ic/ahcisata_core.c: revision 1.31 Don't call bus_dmamap_load(9) and bus_dmamap_sync(9) on command xfers if (AT_READ|AT_WRITE) in ata_c->flags is set but ata_c->bcount is zero. Someone actually tries to put such a command and it causes DIAGNOSTIC panic in x86/bus_dma.c:_bus_dmamap_sync(). I think bus_dma(9) API itself may allow calls with mapsize==0 but there are many MD code that asserts offset>=mapsize or len==0. The problem is reported and fix is confirmed by Takuro KUBOTA with XEN DOM0 kernel (which has options DIAGNOSTIC). To generate a diff of this commit: cvs rdiff -u -r1.18.4.4 -r1.18.4.5 src/sys/dev/ic/ahcisata_core.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.