Date: Wed, 20 Jul 2016 09:29:39 +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: r303076 - head/sys/dev/fb Message-ID: <201607200929.u6K9Td8S040645@repo.freebsd.org>
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Author: royger Date: Wed Jul 20 09:29:39 2016 New Revision: 303076 URL: https://svnweb.freebsd.org/changeset/base/303076 Log: vesa: fix panic on suspend Fix the following panic seen when migrating a FreeBSD guest on Xen: panic: mtx_lock() of destroyed mutex @ /usr/src/sys/dev/fb/vesa.c:541 cpuid = 0 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe001d2fa4f0 vpanic() at vpanic+0x182/frame 0xfffffe001d2fa570 kassert_panic() at kassert_panic+0x126/frame 0xfffffe001d2fa5e0 __mtx_lock_flags() at __mtx_lock_flags+0x15b/frame 0xfffffe001d2fa630 vesa_bios_save_restore() at vesa_bios_save_restore+0x78/frame 0xfffffe001d2fa680 vga_suspend() at vga_suspend+0xa3/frame 0xfffffe001d2fa6b0 isavga_suspend() at isavga_suspend+0x1d/frame 0xfffffe001d2fa6d0 bus_generic_suspend_child() at bus_generic_suspend_child+0x44/frame [...] This is caused because vga_sub_configure (which is called if the VGA adapter is attached after VESA tried to initialize), points to vesa_configure, which doesn't initialize the VESA mutex. In order to fix it, make sure vga_sub_configure points to vesa_load, so that all the needed vesa components are properly initialized. Sponsored by: Citrix Systems R&D MFC after: 3 days PR: 209203 Reviewed by: dumbbell Differential revision: https://reviews.freebsd.org/D7196 Modified: head/sys/dev/fb/vesa.c Modified: head/sys/dev/fb/vesa.c ============================================================================== --- head/sys/dev/fb/vesa.c Wed Jul 20 07:33:48 2016 (r303075) +++ head/sys/dev/fb/vesa.c Wed Jul 20 09:29:39 2016 (r303076) @@ -134,6 +134,7 @@ static vi_fill_rect_t vesa_fill_rect; static vi_bitblt_t vesa_bitblt; static vi_diag_t vesa_diag; static int vesa_bios_info(int level); +static int vesa_late_load(int flags); static video_switch_t vesavidsw = { vesa_probe, @@ -1141,7 +1142,7 @@ vesa_configure(int flags) * initialization for now and try again later. */ if (adp == NULL) { - vga_sub_configure = vesa_configure; + vga_sub_configure = vesa_late_load; return (ENODEV); } @@ -1909,6 +1910,17 @@ vesa_bios_info(int level) static int vesa_load(void) { + + return (vesa_late_load(0)); +} + +/* + * To be called from the vga_sub_configure hook in case the VGA adapter is + * not found when VESA is loaded. + */ +static int +vesa_late_load(int flags) +{ int error; if (vesa_init_done) @@ -1918,7 +1930,7 @@ vesa_load(void) /* locate a VGA adapter */ vesa_adp = NULL; - error = vesa_configure(0); + error = vesa_configure(flags); if (error == 0) vesa_bios_info(bootverbose);
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