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Date: Sun, 14 Jul 2013 10:20:09 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: David Airlie <airlied@...ux.ie>,
Alex Deucher <alexander.deucher@....com>,
Jerome Glisse <jglisse@...hat.com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] radeon kms: do not flush uninitialized hotplug work
On Sun, Jul 14, 2013 at 7:03 AM, Sergey Senozhatsky
<sergey.senozhatsky@...il.com> wrote:
> Fix a warning from lockdep caused by calling flush_work() for
> uninitialized hotplug work. Initialize hotplug_work, audio_work
> and reset_work upon successful radeon_irq_kms_init() completion
> and thus perform hotplug flush_work only when rdev->irq.installed
> is true.
>
> [ 4.790019] [drm] Loading CEDAR Microcode
> [ 4.790943] r600_cp: Failed to load firmware "radeon/CEDAR_smc.bin"
> [ 4.791152] [drm:evergreen_startup] *ERROR* Failed to load firmware!
> [ 4.791330] radeon 0000:01:00.0: disabling GPU acceleration
>
> [ 4.792633] INFO: trying to register non-static key.
> [ 4.792792] the code is fine but needs lockdep annotation.
> [ 4.792953] turning off the locking correctness validator.
>
> [ 4.793114] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.11.0-rc0-dbg-10676-gfe56456-dirty #1816
> [ 4.793314] Hardware name: Acer Aspire 5741G /Aspire 5741G , BIOS V1.20 02/08/2011
> [ 4.793507] ffffffff821fd810 ffff8801530b9a18 ffffffff8160434e 0000000000000002
> [ 4.794155] ffff8801530b9ad8 ffffffff810b8404 ffff8801530b0798 ffff8801530b0000
> [ 4.794789] ffff8801530b9b00 0000000000000046 00000000000004c0 ffffffff00000000
> [ 4.795418] Call Trace:
> [ 4.795573] [<ffffffff8160434e>] dump_stack+0x4e/0x82
> [ 4.795731] [<ffffffff810b8404>] __lock_acquire+0x1a64/0x1d30
> [ 4.795893] [<ffffffff814a87f0>] ? dev_vprintk_emit+0x50/0x60
> [ 4.796034] [<ffffffff810b8fb4>] lock_acquire+0xa4/0x200
> [ 4.796216] [<ffffffff8106cd75>] ? flush_work+0x5/0x280
> [ 4.796375] [<ffffffff8106cdad>] flush_work+0x3d/0x280
> [ 4.796520] [<ffffffff8106cd75>] ? flush_work+0x5/0x280
> [ 4.796682] [<ffffffff810b659d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
> [ 4.796862] [<ffffffff8131d775>] ? delay_tsc+0x95/0xf0
> [ 4.797024] [<ffffffff8141bb8b>] radeon_irq_kms_fini+0x2b/0x70
> [ 4.797186] [<ffffffff814557c9>] evergreen_init+0x2a9/0x2e0
> [ 4.797347] [<ffffffff813ebb1f>] radeon_device_init+0x5ef/0x700
> [ 4.797511] [<ffffffff81335bc7>] ? pci_find_capability+0x47/0x50
> [ 4.797672] [<ffffffff813edaed>] radeon_driver_load_kms+0x8d/0x150
> [ 4.797843] [<ffffffff813ce426>] drm_get_pci_dev+0x166/0x280
> [ 4.798007] [<ffffffff8116cff5>] ? kfree+0xf5/0x2e0
> [ 4.798168] [<ffffffff813ea298>] ? radeon_pci_probe+0x98/0xd0
> [ 4.798329] [<ffffffff813ea2aa>] radeon_pci_probe+0xaa/0xd0
> [ 4.798489] [<ffffffff81339404>] pci_device_probe+0x84/0xe0
> [ 4.798644] [<ffffffff814ac7d6>] driver_probe_device+0x76/0x240
> [ 4.798805] [<ffffffff814aca73>] __driver_attach+0x93/0xa0
> [ 4.798948] [<ffffffff814ac9e0>] ? __device_attach+0x40/0x40
> [ 4.799126] [<ffffffff814aa82b>] bus_for_each_dev+0x6b/0xb0
> [ 4.799272] [<ffffffff814ac2be>] driver_attach+0x1e/0x20
> [ 4.799434] [<ffffffff814abec0>] bus_add_driver+0x1f0/0x280
> [ 4.799596] [<ffffffff814ad0e4>] driver_register+0x74/0x150
> [ 4.799758] [<ffffffff8133923d>] __pci_register_driver+0x5d/0x60
> [ 4.799936] [<ffffffff81d16efc>] ? ttm_init+0x67/0x67
> [ 4.800081] [<ffffffff813ce655>] drm_pci_init+0x115/0x130
> [ 4.800243] [<ffffffff81d16efc>] ? ttm_init+0x67/0x67
> [ 4.800405] [<ffffffff81d16f98>] radeon_init+0x9c/0xba
> [ 4.800586] [<ffffffff810002ca>] do_one_initcall+0xfa/0x150
> [ 4.800746] [<ffffffff81073f60>] ? parse_args+0x120/0x330
> [ 4.800909] [<ffffffff81cdafae>] kernel_init_freeable+0x111/0x191
> [ 4.801052] [<ffffffff81cda87a>] ? do_early_param+0x88/0x88
> [ 4.801233] [<ffffffff815fb670>] ? rest_init+0x140/0x140
> [ 4.801393] [<ffffffff815fb67e>] kernel_init+0xe/0x180
> [ 4.801556] [<ffffffff8160dcac>] ret_from_fork+0x7c/0xb0
> [ 4.801718] [<ffffffff815fb670>] ? rest_init+0x140/0x140
>
>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
>
Applied to by fixes tree. thanks!
Alex
> ---
>
> drivers/gpu/drm/radeon/radeon_irq_kms.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
> index bcdefd1..081886b 100644
> --- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
> @@ -260,10 +260,6 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
> {
> int r = 0;
>
> - INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
> - INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
> - INIT_WORK(&rdev->reset_work, radeon_irq_reset_work_func);
> -
> spin_lock_init(&rdev->irq.lock);
> r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
> if (r) {
> @@ -285,6 +281,11 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
> rdev->irq.installed = false;
> return r;
> }
> +
> + INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
> + INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
> + INIT_WORK(&rdev->reset_work, radeon_irq_reset_work_func);
> +
> DRM_INFO("radeon: irq initialized.\n");
> return 0;
> }
> @@ -304,8 +305,8 @@ void radeon_irq_kms_fini(struct radeon_device *rdev)
> rdev->irq.installed = false;
> if (rdev->msi_enabled)
> pci_disable_msi(rdev->pdev);
> + flush_work(&rdev->hotplug_work);
> }
> - flush_work(&rdev->hotplug_work);
> }
>
> /**
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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