* [PATCH] drm/nouveau/imem/nv50: fix incorrect use of refcount API
@ 2017-12-08 18:30 Ard Biesheuvel
2017-12-09 0:01 ` Adam Borowski
2017-12-18 8:27 ` Ard Biesheuvel
0 siblings, 2 replies; 4+ messages in thread
From: Ard Biesheuvel @ 2017-12-08 18:30 UTC (permalink / raw)
To: bskeggs, airlied, dri-devel, nouveau, linux-kernel
Cc: daniel.thompson, masami.hiramatsu, Ard Biesheuvel
Commit be55287aa5b ("drm/nouveau/imem/nv50: embed nvkm_instobj directly
into nv04_instobj") introduced some new calls to the refcount api to
the nv50 mapping code. In one particular instance, it does the
following:
if (!refcount_inc_not_zero(&iobj->maps)) {
...
refcount_inc(&iobj->maps);
}
i.e., it calls refcount_inc() to increment the refcount when it is known
to be zero, which is explicitly forbidden by the API. Instead, use
refcount_set() to set it to 1.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
Apologies if this was already found and fixed. I don't usually follow
the DRM or nouveau mailing lists.
drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
index 1ba7289684aa..db48a1daca0c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
@@ -249,7 +249,7 @@ nv50_instobj_acquire(struct nvkm_memory *memory)
iobj->base.memory.ptrs = &nv50_instobj_fast;
else
iobj->base.memory.ptrs = &nv50_instobj_slow;
- refcount_inc(&iobj->maps);
+ refcount_set(&iobj->maps, 1);
}
mutex_unlock(&imem->subdev.mutex);
--
2.11.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/nouveau/imem/nv50: fix incorrect use of refcount API
2017-12-08 18:30 [PATCH] drm/nouveau/imem/nv50: fix incorrect use of refcount API Ard Biesheuvel
@ 2017-12-09 0:01 ` Adam Borowski
2017-12-18 8:27 ` Ard Biesheuvel
1 sibling, 0 replies; 4+ messages in thread
From: Adam Borowski @ 2017-12-09 0:01 UTC (permalink / raw)
To: Ard Biesheuvel
Cc: bskeggs, airlied, dri-devel, nouveau, linux-kernel,
daniel.thompson, masami.hiramatsu
On Fri, Dec 08, 2017 at 06:30:34PM +0000, Ard Biesheuvel wrote:
> Commit be55287aa5b ("drm/nouveau/imem/nv50: embed nvkm_instobj directly
> into nv04_instobj") introduced some new calls to the refcount api to
> the nv50 mapping code. In one particular instance, it does the
> following:
>
> if (!refcount_inc_not_zero(&iobj->maps)) {
> ...
> refcount_inc(&iobj->maps);
> }
>
> i.e., it calls refcount_inc() to increment the refcount when it is known
> to be zero, which is explicitly forbidden by the API. Instead, use
> refcount_set() to set it to 1.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
Awesome! Works for me.
> Apologies if this was already found and fixed. I don't usually follow
> the DRM or nouveau mailing lists.
I see nothing relevant in dri-devel and nouveau archives, except my
complaint (GTX 560 Ti (GF114)):
https://lists.freedesktop.org/archives/nouveau/2017-December/029264.html
and Richard Narron seconding it (MSI GeForce 210):
https://lists.freedesktop.org/archives/nouveau/2017-December/029276.html
> drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
> index 1ba7289684aa..db48a1daca0c 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
> @@ -249,7 +249,7 @@ nv50_instobj_acquire(struct nvkm_memory *memory)
> iobj->base.memory.ptrs = &nv50_instobj_fast;
> else
> iobj->base.memory.ptrs = &nv50_instobj_slow;
> - refcount_inc(&iobj->maps);
> + refcount_set(&iobj->maps, 1);
> }
>
> mutex_unlock(&imem->subdev.mutex);
> --
I'm just a dumb user here, my tags don't carry a weight, but Tested-by:.
Meow!
--
// If you believe in so-called "intellectual property", please immediately
// cease using counterfeit alphabets. Instead, contact the nearest temple
// of Amon, whose priests will provide you with scribal services for all
// your writing needs, for Reasonable And Non-Discriminatory prices.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/nouveau/imem/nv50: fix incorrect use of refcount API
2017-12-08 18:30 [PATCH] drm/nouveau/imem/nv50: fix incorrect use of refcount API Ard Biesheuvel
2017-12-09 0:01 ` Adam Borowski
@ 2017-12-18 8:27 ` Ard Biesheuvel
[not found] ` <20171218121628.akfvzmlvqvkbtjno@pmoreau.org>
1 sibling, 1 reply; 4+ messages in thread
From: Ard Biesheuvel @ 2017-12-18 8:27 UTC (permalink / raw)
To: Ben Skeggs, David Airlie, dri-devel, nouveau, linux-kernel
Cc: Daniel Thompson, Masami Hiramatsu, Ard Biesheuvel
On 8 December 2017 at 19:30, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
> Commit be55287aa5b ("drm/nouveau/imem/nv50: embed nvkm_instobj directly
> into nv04_instobj") introduced some new calls to the refcount api to
> the nv50 mapping code. In one particular instance, it does the
> following:
>
> if (!refcount_inc_not_zero(&iobj->maps)) {
> ...
> refcount_inc(&iobj->maps);
> }
>
> i.e., it calls refcount_inc() to increment the refcount when it is known
> to be zero, which is explicitly forbidden by the API. Instead, use
> refcount_set() to set it to 1.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>
> Apologies if this was already found and fixed. I don't usually follow
> the DRM or nouveau mailing lists.
>
> drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
> index 1ba7289684aa..db48a1daca0c 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
> @@ -249,7 +249,7 @@ nv50_instobj_acquire(struct nvkm_memory *memory)
> iobj->base.memory.ptrs = &nv50_instobj_fast;
> else
> iobj->base.memory.ptrs = &nv50_instobj_slow;
> - refcount_inc(&iobj->maps);
> + refcount_set(&iobj->maps, 1);
> }
>
> mutex_unlock(&imem->subdev.mutex);
> --
> 2.11.0
>
Ping?
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-12-18 13:19 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2017-12-08 18:30 [PATCH] drm/nouveau/imem/nv50: fix incorrect use of refcount API Ard Biesheuvel
2017-12-09 0:01 ` Adam Borowski
2017-12-18 8:27 ` Ard Biesheuvel
[not found] ` <20171218121628.akfvzmlvqvkbtjno@pmoreau.org>
2017-12-18 13:19 ` [Nouveau] " Ard Biesheuvel
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