Date: Fri, 29 Jul 2016 16:35:58 +0000 (UTC) From: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <royger@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r303491 - head/sys/x86/x86 Message-ID: <201607291635.u6TGZwsg068277@repo.freebsd.org>
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Author: royger Date: Fri Jul 29 16:35:58 2016 New Revision: 303491 URL: https://svnweb.freebsd.org/changeset/base/303491 Log: Revert r291022: x86/intr: allow mutex recursion in intr_remove_handler This was only needed for Xen, and a better way to deal with this issue has been found, so this commit can be reverted. Sponsored by: Citrix Systems R&D MFC after: 5 days Reviewed by: kib Differential revision: https://reviews.freebsd.org/D7363 Modified: head/sys/x86/x86/intr_machdep.c Modified: head/sys/x86/x86/intr_machdep.c ============================================================================== --- head/sys/x86/x86/intr_machdep.c Fri Jul 29 16:34:54 2016 (r303490) +++ head/sys/x86/x86/intr_machdep.c Fri Jul 29 16:35:58 2016 (r303491) @@ -197,28 +197,19 @@ int intr_remove_handler(void *cookie) { struct intsrc *isrc; - int error, mtx_owned; + int error; isrc = intr_handler_source(cookie); error = intr_event_remove_handler(cookie); if (error == 0) { - /* - * 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); + 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); - if (mtx_owned == 0) - mtx_unlock(&intr_table_lock); + mtx_unlock(&intr_table_lock); } return (error); }
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