Author: royger Date: Wed Dec 2 10:23:54 2015 New Revision: 291644 URL: https://svnweb.freebsd.org/changeset/base/291644
Log: MFC r291022: x86/intr: allow mutex recursion in intr_remove_handler Sponsored by: Citrix Systems R&D Modified: stable/10/sys/x86/x86/intr_machdep.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/x86/x86/intr_machdep.c ============================================================================== --- stable/10/sys/x86/x86/intr_machdep.c Wed Dec 2 08:17:31 2015 (r291643) +++ stable/10/sys/x86/x86/intr_machdep.c Wed Dec 2 10:23:54 2015 (r291644) @@ -197,19 +197,28 @@ int intr_remove_handler(void *cookie) { struct intsrc *isrc; - int error; + int error, mtx_owned; isrc = intr_handler_source(cookie); error = intr_event_remove_handler(cookie); if (error == 0) { - mtx_lock(&intr_table_lock); + /* + * Recursion is needed here so PICs can remove interrupts + * while resuming. It was previously not possible due to + * intr_resume holding the intr_table_lock and + * intr_remove_handler recursing on it. + */ + mtx_owned = mtx_owned(&intr_table_lock); + if (mtx_owned == 0) + mtx_lock(&intr_table_lock); isrc->is_handlers--; if (isrc->is_handlers == 0) { isrc->is_pic->pic_disable_source(isrc, PIC_NO_EOI); isrc->is_pic->pic_disable_intr(isrc); } intrcnt_updatename(isrc); - mtx_unlock(&intr_table_lock); + if (mtx_owned == 0) + mtx_unlock(&intr_table_lock); } return (error); } _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"