http://bugs.freedesktop.org/show_bug.cgi?id=17191
Summary: libdrm has sign-extension bug in drmIoctl Product: DRI Version: XOrg CVS Platform: x86-64 (AMD64) OS/Version: FreeBSD Status: NEW Severity: normal Priority: medium Component: libdrm AssignedTo: dri-devel@lists.sourceforge.net ReportedBy: [EMAIL PROTECTED] Created an attachment (id=18361) --> (http://bugs.freedesktop.org/attachment.cgi?id=18361) Patch to libdrm to fix the problem on FreeBSD/amd64 FreeBSD amd64 reports a sign-extension on the ioctl calls which pass through drmIoctl in xf86drm.c. The problem is that the request is typed as "int" (a signed, 32-bit type), while the ioctl system call expects this to be an "unsigned long" (an unsigned, 64-bit type). As it first performs the signed conversion, then the field extension, any ioctl's with the high-bit set will have all high 32-bits set in the ioctl passed to the driver. The drm driver is only looking for unsigned long ioctl requests, so none of these high ioctls will succeed. This eventually leads to a hang in the X-server on my system. For instance: ioctl request 0xc0001432 becomes 0xffffffffc0001432, but the drm driver is looking for 0x00000000c0001432, so the subsequent ioctls never succeed. -- Configure bugmail: http://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel