3.16.66-rc1 review patch. If anyone has any objections, please let me know.
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From: Tina Zhang tina.zhang@intel.com
commit a2fcd5c84f7a7825e028381b10182439067aa90d upstream.
This patch prevents division by zero htotal.
In a follow-up mail Tina writes:
How did you manage to get here with htotal == 0? This needs backtraces (or if this is just about static checkers, a mention of that). -Daniel
In GVT-g, we are trying to enable a virtual display w/o setting timings for a pipe (a.k.a htotal=0), then we met the following kernel panic:
[ 32.832048] divide error: 0000 [#1] SMP PTI [ 32.833614] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.18.0-rc4-sriov+ #33 [ 32.834438] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.10.1-0-g8891697-dirty-20180511_165818-tinazhang-linux-1 04/01/2014 [ 32.835901] RIP: 0010:drm_mode_hsync+0x1e/0x40 [ 32.836004] Code: 31 c0 c3 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 8b 87 d8 00 00 00 85 c0 75 22 8b 4f 68 85 c9 78 1b 69 47 58 e8 03 00 00 99 <f7> f9 b9 d3 4d 62 10 05 f4 01 00 00 f7 e1 89 d0 c1 e8 06 f3 c3 66 [ 32.836004] RSP: 0000:ffffc900000ebb90 EFLAGS: 00010206 [ 32.836004] RAX: 0000000000000000 RBX: ffff88001c67c8a0 RCX: 0000000000000000 [ 32.836004] RDX: 0000000000000000 RSI: ffff88001c67c000 RDI: ffff88001c67c8a0 [ 32.836004] RBP: ffff88001c7d03a0 R08: ffff88001c67c8a0 R09: ffff88001c7d0330 [ 32.836004] R10: ffffffff822c3a98 R11: 0000000000000001 R12: ffff88001c67c000 [ 32.836004] R13: ffff88001c7d0370 R14: ffffffff8207eb78 R15: ffff88001c67c800 [ 32.836004] FS: 0000000000000000(0000) GS:ffff88001da00000(0000) knlGS:0000000000000000 [ 32.836004] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.836004] CR2: 0000000000000000 CR3: 000000000220a000 CR4: 00000000000006f0 [ 32.836004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.836004] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.836004] Call Trace: [ 32.836004] intel_mode_from_pipe_config+0x72/0x90 [ 32.836004] intel_modeset_setup_hw_state+0x569/0xf90 [ 32.836004] intel_modeset_init+0x905/0x1db0 [ 32.836004] i915_driver_load+0xb8c/0x1120 [ 32.836004] i915_pci_probe+0x4d/0xb0 [ 32.836004] local_pci_probe+0x44/0xa0 [ 32.836004] ? pci_assign_irq+0x27/0x130 [ 32.836004] pci_device_probe+0x102/0x1c0 [ 32.836004] driver_probe_device+0x2b8/0x480 [ 32.836004] __driver_attach+0x109/0x110 [ 32.836004] ? driver_probe_device+0x480/0x480 [ 32.836004] bus_for_each_dev+0x67/0xc0 [ 32.836004] ? klist_add_tail+0x3b/0x70 [ 32.836004] bus_add_driver+0x1e8/0x260 [ 32.836004] driver_register+0x5b/0xe0 [ 32.836004] ? mipi_dsi_bus_init+0x11/0x11 [ 32.836004] do_one_initcall+0x4d/0x1eb [ 32.836004] kernel_init_freeable+0x197/0x237 [ 32.836004] ? rest_init+0xd0/0xd0 [ 32.836004] kernel_init+0xa/0x110 [ 32.836004] ret_from_fork+0x35/0x40 [ 32.836004] Modules linked in: [ 32.859183] ---[ end trace 525608b0ed0e8665 ]--- [ 32.859722] RIP: 0010:drm_mode_hsync+0x1e/0x40 [ 32.860287] Code: 31 c0 c3 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 8b 87 d8 00 00 00 85 c0 75 22 8b 4f 68 85 c9 78 1b 69 47 58 e8 03 00 00 99 <f7> f9 b9 d3 4d 62 10 05 f4 01 00 00 f7 e1 89 d0 c1 e8 06 f3 c3 66 [ 32.862680] RSP: 0000:ffffc900000ebb90 EFLAGS: 00010206 [ 32.863309] RAX: 0000000000000000 RBX: ffff88001c67c8a0 RCX: 0000000000000000 [ 32.864182] RDX: 0000000000000000 RSI: ffff88001c67c000 RDI: ffff88001c67c8a0 [ 32.865206] RBP: ffff88001c7d03a0 R08: ffff88001c67c8a0 R09: ffff88001c7d0330 [ 32.866359] R10: ffffffff822c3a98 R11: 0000000000000001 R12: ffff88001c67c000 [ 32.867213] R13: ffff88001c7d0370 R14: ffffffff8207eb78 R15: ffff88001c67c800 [ 32.868075] FS: 0000000000000000(0000) GS:ffff88001da00000(0000) knlGS:0000000000000000 [ 32.868983] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.869659] CR2: 0000000000000000 CR3: 000000000220a000 CR4: 00000000000006f0 [ 32.870599] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.871598] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.872549] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
Since drm_mode_hsync() has the logic to check mode->htotal, I just extend it to cover the case htotal==0.
Signed-off-by: Tina Zhang tina.zhang@intel.com Cc: Adam Jackson ajax@redhat.com Cc: Dave Airlie airlied@redhat.com Cc: Daniel Vetter daniel@ffwll.ch [danvet: Add additional explanations + cc: stable.] Signed-off-by: Daniel Vetter daniel.vetter@ffwll.ch Link: https://patchwork.freedesktop.org/patch/msgid/1548228539-3061-1-git-send-ema... Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/gpu/drm/drm_modes.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -682,7 +682,7 @@ int drm_mode_hsync(const struct drm_disp if (mode->hsync) return mode->hsync;
- if (mode->htotal < 0) + if (mode->htotal <= 0) return 0;
calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */