From: Jani Nikula <jani.nikula@linux.intel.com>
To: Daniel Vetter <daniel.vetter@ffwll.ch>,
DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@intel.com>,
Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: Re: [Intel-gfx] [PATCH 02/51] drm/i915: Don't clear drvdata in ->release
Date: Thu, 26 Mar 2020 15:15:04 +0200 [thread overview]
Message-ID: <87v9mrgsvb.fsf@intel.com> (raw)
In-Reply-To: <87o8ski9e1.fsf@intel.com>
On Wed, 25 Mar 2020, Jani Nikula <jani.nikula@linux.intel.com> wrote:
> On Mon, 23 Mar 2020, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>> For two reasons:
>>
>> - The driver core clears this already for us after we're unloaded in
>> __device_release_driver().
>>
>> - It's way too late, the drm_device ->release callback might massively
>> outlive the underlying physical device, since a drm_device can't be
>
> *can be*?
>
>> kept alive by open drm_file or well really anything else userspace
>> is still hanging onto. So if we clear this ourselves, we should
>> clear it in the pci ->remove callback, not in the drm_device
>> ->relase callback.
>
> ->release
>
> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Oops,
drivers/gpu/drm/i915/i915_drv.c: In function ‘i915_driver_destroy’:
drivers/gpu/drm/i915/i915_drv.c:911:18: error: unused variable ‘pdev’ [-Werror=unused-variable]
struct pci_dev *pdev = i915->drm.pdev;
^~~~
>
>>
>> Looking at git history this was fixed in the driver core with
>>
>> commit 0998d0631001288a5974afc0b2a5f568bcdecb4d
>> Author: Hans de Goede <hdegoede@redhat.com>
>> Date: Wed May 23 00:09:34 2012 +0200
>>
>> device-core: Ensure drvdata = NULL when no driver is bound
>>
>> v2: Cite the core fix in the commit message (Chris).
>>
>> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
>> ---
>> drivers/gpu/drm/i915/i915_drv.c | 3 ---
>> 1 file changed, 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
>> index 48ba37e35bea..4792051e9e2e 100644
>> --- a/drivers/gpu/drm/i915/i915_drv.c
>> +++ b/drivers/gpu/drm/i915/i915_drv.c
>> @@ -909,9 +909,6 @@ static void i915_driver_destroy(struct drm_i915_private *i915)
>>
>> drm_dev_fini(&i915->drm);
>> kfree(i915);
>> -
>> - /* And make sure we never chase our dangling pointer from pci_dev */
>> - pci_set_drvdata(pdev, NULL);
>> }
>>
>> /**
--
Jani Nikula, Intel Open Source Graphics Center
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next prev parent reply other threads:[~2020-03-26 13:15 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 14:48 [PATCH 00/51] drm_device managed resources, v5 Daniel Vetter
2020-03-23 14:49 ` [PATCH 01/51] mm/sl[uo]b: export __kmalloc_track(_node)_caller Daniel Vetter
2020-03-26 13:46 ` Daniel Vetter
2020-03-23 14:49 ` [PATCH 02/51] drm/i915: Don't clear drvdata in ->release Daniel Vetter
2020-03-25 18:20 ` [Intel-gfx] " Jani Nikula
2020-03-26 13:15 ` Jani Nikula [this message]
2020-03-23 14:49 ` [PATCH 03/51] drm: add managed resources tied to drm_device Daniel Vetter
2020-03-23 18:36 ` Sam Ravnborg
2020-03-24 12:45 ` [PATCH] " Daniel Vetter
2020-03-23 14:49 ` [PATCH 04/51] drm: Set final_kfree in drm_dev_alloc Daniel Vetter
2020-03-23 14:49 ` [PATCH 05/51] drm/mipi_dbi: Use drmm_add_final_kfree in all drivers Daniel Vetter
2020-03-23 14:49 ` [PATCH 06/51] drm/udl: Use drmm_add_final_kfree Daniel Vetter
2020-03-23 14:49 ` [PATCH 07/51] drm/qxl: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 08/51] drm/i915: " Daniel Vetter
2020-03-26 13:10 ` Jani Nikula
2020-03-26 13:33 ` Daniel Vetter
2020-03-23 14:49 ` [PATCH 09/51] drm/cirrus: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 10/51] drm/v3d: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 11/51] drm/tidss: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 12/51] drm/mcde: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 13/51] drm/vgem: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 14/51] drm/vkms: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 15/51] drm/repaper: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 16/51] drm/ingenic: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 17/51] drm/gm12u320: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 18/51] drm/<drivers>: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 19/51] drm: Cleanups after drmm_add_final_kfree rollout Daniel Vetter
2020-04-02 0:50 ` Laurent Pinchart
2020-04-02 5:17 ` Daniel Vetter
2020-04-02 9:39 ` Laurent Pinchart
2020-04-02 9:50 ` Daniel Vetter
2020-03-23 14:49 ` [PATCH 20/51] drm: Handle dev->unique with drmm_ Daniel Vetter
2020-03-23 14:49 ` [PATCH 21/51] drm: Use drmm_ for drm_dev_init cleanup Daniel Vetter
2020-03-24 21:20 ` Sam Ravnborg
2020-03-23 14:49 ` [PATCH 22/51] drm: manage drm_minor cleanup with drmm_ Daniel Vetter
2020-03-24 8:54 ` Thomas Zimmermann
2020-03-24 20:39 ` [PATCH] " Daniel Vetter
2020-03-24 21:42 ` Sam Ravnborg
2020-03-25 9:09 ` Daniel Vetter
2020-03-24 21:36 ` [PATCH 22/51] " Sam Ravnborg
2020-03-25 9:07 ` Daniel Vetter
2020-03-23 14:49 ` [PATCH 23/51] drm: Manage drm_gem_init " Daniel Vetter
2020-03-23 14:49 ` [PATCH 24/51] drm: Manage drm_vblank_cleanup " Daniel Vetter
2020-03-23 14:49 ` [PATCH 25/51] drm: Garbage collect drm_dev_fini Daniel Vetter
2020-03-23 14:49 ` [PATCH 26/51] drm: Manage drm_mode_config_init with drmm_ Daniel Vetter
2020-03-23 14:49 ` [PATCH 27/51] drm/bochs: Remove leftover drm_atomic_helper_shutdown Daniel Vetter
2020-03-23 14:49 ` [PATCH 28/51] drm/bochs: Drop explicit drm_mode_config_cleanup Daniel Vetter
2020-03-23 14:49 ` [PATCH 29/51] drm/cirrus: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 30/51] drm/cirrus: Fully embrace devm_ Daniel Vetter
2020-03-23 14:49 ` [PATCH 31/51] drm/ingenic: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 32/51] drm/mcde: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 33/51] drm/mcde: More devm_drm_dev_init Daniel Vetter
2020-03-23 14:49 ` [PATCH 34/51] drm/meson: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 35/51] drm/pl111: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 36/51] drm/rcar-du: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 37/51] drm/rockchip: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 38/51] drm/stm: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 39/51] drm/shmob: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 40/51] drm/mtk: " Daniel Vetter
2020-03-23 15:27 ` Chun-Kuang Hu
2020-03-23 14:49 ` [PATCH 41/51] drm/tidss: " Daniel Vetter
2020-03-23 14:49 ` [PATCH 42/51] drm/gm12u320: More drmm_ Daniel Vetter
2020-03-23 14:49 ` [PATCH 43/51] drm/gm12u320: Use devm_drm_dev_init Daniel Vetter
2020-03-23 14:49 ` [PATCH 44/51] drm/gm12u320: Use helpers for shutdown/suspend/resume Daniel Vetter
2020-03-23 14:49 ` [PATCH 45/51] drm/gm12u320: Simplify upload work Daniel Vetter
2020-03-23 14:49 ` [PATCH 46/51] drm/repaper: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 47/51] drm/mipi-dbi: Move drm_mode_config_init into mipi library Daniel Vetter
2020-03-23 14:49 ` [PATCH 48/51] drm/mipi-dbi: Drop explicit drm_mode_config_cleanup call Daniel Vetter
2020-03-23 14:49 ` [PATCH 49/51] drm/udl: " Daniel Vetter
2020-03-24 8:56 ` Thomas Zimmermann
2020-03-23 14:49 ` [PATCH 50/51] drm/udl: drop drm_driver.release hook Daniel Vetter
2020-03-23 14:49 ` [PATCH 51/51] drm: Add docs for managed resources Daniel Vetter
2020-03-26 15:10 ` [PATCH 00/51] drm_device managed resources, v5 Daniel Vetter
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