linux-kernel - Re: [PATCH 5.12 237/242] drm/ast: Remove reference to struct drm

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Message-ID: <2ba3d853-f334-ba0e-3cdc-1e9a03f99b51@suse.de>
Date:   Mon, 19 Jul 2021 16:35:21 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Xiaotian Feng <xtfeng@...il.com>
Cc:     kernel test robot <lkp@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org,
        "Michael J. Ruhl" <michael.j.ruhl@...el.com>,
        dri-devel@...ts.freedesktop.org, Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH 5.12 237/242] drm/ast: Remove reference to struct
 drm_device.pdev

hi

Am 19.07.21 um 13:23 schrieb Greg Kroah-Hartman:
> On Mon, Jul 19, 2021 at 05:57:30PM +0800, Xiaotian Feng wrote:
>> On Fri, Jul 16, 2021 at 5:13 AM Greg Kroah-Hartman
>> <gregkh@...uxfoundation.org> wrote:
>>>
>>> From: Thomas Zimmermann <tzimmermann@...e.de>
>>>
>>> commit 0ecb51824e838372e01330752503ddf9c0430ef7 upstream.
>>>
>>> Using struct drm_device.pdev is deprecated. Upcast with to_pci_dev()
>>> from struct drm_device.dev to get the PCI device structure.
>>>
>>> v9:
>>>          * fix remaining pdev references
>>>
>>> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
>>> Reviewed-by: Michael J. Ruhl <michael.j.ruhl@...el.com>
>>> Fixes: ba4e0339a6a3 ("drm/ast: Fixed CVE for DP501")
>>> Cc: KuoHsiang Chou <kuohsiang_chou@...eedtech.com>
>>> Cc: kernel test robot <lkp@...el.com>
>>> Cc: Thomas Zimmermann <tzimmermann@...e.de>
>>> Cc: Dave Airlie <airlied@...hat.com>
>>> Cc: dri-devel@...ts.freedesktop.org
>>> Link: https://patchwork.freedesktop.org/patch/msgid/20210429105101.25667-2-tzimmermann@suse.de
>>> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>> ---
>>>   drivers/gpu/drm/ast/ast_main.c |    5 ++---
>>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>>
>>> --- a/drivers/gpu/drm/ast/ast_main.c
>>> +++ b/drivers/gpu/drm/ast/ast_main.c
>>> @@ -411,7 +411,6 @@ struct ast_private *ast_device_create(co
>>>                  return ast;
>>>          dev = &ast->base;
>>>
>>> -       dev->pdev = pdev;
>>>          pci_set_drvdata(pdev, dev);
>>>
>>>          ast->regs = pcim_iomap(pdev, 1, 0);
>>> @@ -453,8 +452,8 @@ struct ast_private *ast_device_create(co
>>>
>>>          /* map reserved buffer */
>>>          ast->dp501_fw_buf = NULL;
>>> -       if (dev->vram_mm->vram_size < pci_resource_len(dev->pdev, 0)) {
>>> -               ast->dp501_fw_buf = pci_iomap_range(dev->pdev, 0, dev->vram_mm->vram_size, 0);
>>> +       if (dev->vram_mm->vram_size < pci_resource_len(pdev, 0)) {
>>> +               ast->dp501_fw_buf = pci_iomap_range(pdev, 0, dev->vram_mm->vram_size, 0);
>>>                  if (!ast->dp501_fw_buf)
>>>                          drm_info(dev, "failed to map reserved buffer!\n");
>>>          }
>>>
>>
>> Hi Greg,
>>
>>       This backport is incomplete for 5.10 kernel,  kernel is panicked
>> on RIP: ast_device_create+0x7d.  When I look into the crash code, I
>> found
>>
>> struct ast_private *ast_device_create(struct drm_driver *drv,
>>                                        struct pci_dev *pdev,
>>                                        unsigned long flags)
>> {
>> .......
>>          dev->pdev = pdev;  // This is removed
>>          pci_set_drvdata(pdev, dev);
>>
>>          ast->regs = pcim_iomap(pdev, 1, 0);
>>          if (!ast->regs)
>>                  return ERR_PTR(-EIO);
>>
>>          /*
>>           * If we don't have IO space at all, use MMIO now and
>>           * assume the chip has MMIO enabled by default (rev 0x20
>>           * and higher).
>>           */
>>          if (!(pci_resource_flags(dev->pdev, 2) & IORESOURCE_IO)) { //
>> dev->pdev is in used here.
>>                  drm_info(dev, "platform has no IO space, trying MMIO\n");
>>                  ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
>>          }
>>
>>          That's because commit 46fb883c3d0d8a823ef995ddb1f9b0817dea6882
>> is not backported to 5.10 kernel.
> 
> So what should I do here?  Backport that commit (was was not called
> out), or just revert this?

Best drop all these 'remove pdev' patches from stable. They are no bugfixes.

Best regards
Thomas

> 
> thanks,
> 
> greg k-h
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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