Re: [PATCH] drm/i915: Fix CSR MMIO address check

[Jani Nikula <jani.nikula@linux.intel.com>]

On Wed, 09 Sep 2015, Animesh Manna <animesh.manna@intel.com> wrote:
> On 9/9/2015 9:00 PM, Daniel Vetter wrote:
>> On Wed, Sep 09, 2015 at 04:52:09PM +0200, Takashi Iwai wrote:
>>> Fix a wrong logical AND (&&) used for the range check of CSR MMIO.
>>>
>>> Spotted nicely by gcc -Wlogical-op flag:
>>>    drivers/gpu/drm/i915/intel_csr.c: In function ‘finish_csr_load’:
>>>    drivers/gpu/drm/i915/intel_csr.c:353:41: warning: logical ‘and’ of mutually exclusive tests is always false [-Wlogical-op]
>>>
>>> Fixes: eb805623d8b1 ('drm/i915/skl: Add support to load SKL CSR firmware.')
>>> Cc: <stable@vger.kernel.org> # v4.2
>>> Signed-off-by: Takashi Iwai <tiwai@suse.de>
>> Oops. Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> and for Jani.
>> -Daniel
> The same change is submitted part of dmc-redesign patch series.
> http://lists.freedesktop.org/archives/intel-gfx/2015-August/074447.html

Pushed Takashi's patch to drm-intel-next-fixes, thanks for the patch and
review.

When there are multiple patches doing the same thing, I usually pick the
earliest submitted. However Animesh's patch did not apply because it is
at the end of a long series. Indeed you should always prefer doing fixes
first, especially if they need to be backported to stable kernels. I
took the liberty of adding Animesh's contribution as Reviewed-by.

BR,
Jani.


>
> -Animesh
>>
>>> ---
>>>   drivers/gpu/drm/i915/intel_csr.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
>>> index ba1ae031e6fd..d0f1b8d833cd 100644
>>> --- a/drivers/gpu/drm/i915/intel_csr.c
>>> +++ b/drivers/gpu/drm/i915/intel_csr.c
>>> @@ -350,7 +350,7 @@ static void finish_csr_load(const struct firmware *fw, void *context)
>>>   	}
>>>   	csr->mmio_count = dmc_header->mmio_count;
>>>   	for (i = 0; i < dmc_header->mmio_count; i++) {
>>> -		if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE &&
>>> +		if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE ||
>>>   			dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) {
>>>   			DRM_ERROR(" Firmware has wrong mmio address 0x%x\n",
>>>   						dmc_header->mmioaddr[i]);
>>> -- 
>>> 2.5.1
>>>
>
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-- 
Jani Nikula, Intel Open Source Technology Center
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