* [RESEND PATCH] drm: Remove obsolete "This is gross" comment
@ 2017-09-21 21:04 ` Haneen Mohammed
0 siblings, 0 replies; 13+ messages in thread
From: Haneen Mohammed @ 2017-09-21 21:04 UTC (permalink / raw)
To: outreachy-kernel; +Cc: gregkh, dri-devel, Daniel Vetter
Remove obsolete comment which was initially added in 2008 to annotate
that idr_find() was used before idr_remove() since idr_remove() didn't
use to return feedback. The comment now is irrelevant with
commit f6cd7daecff5 ("drm: Release driver references to handle before
making it available again").
Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
---
drivers/gpu/drm/drm_gem.c | 9 ---------
1 file changed, 9 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index c55f338..b9bddaa 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
{
struct drm_gem_object *obj;
- /* This is gross. The idr system doesn't let us try a delete and
- * return an error code. It just spews if you fail at deleting.
- * So, we have to grab a lock around finding the object and then
- * doing the delete on it and dropping the refcount, or the user
- * could race us to double-decrement the refcount and cause a
- * use-after-free later. Given the frequency of our handle lookups,
- * we may want to use ida for number allocation and a hash table
- * for the pointers, anyway.
- */
spin_lock(&filp->table_lock);
/* Check if we currently have a reference on the object */
--
2.7.4
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [RESEND PATCH] drm: Remove obsolete "This is gross" comment
@ 2017-09-21 21:04 ` Haneen Mohammed
0 siblings, 0 replies; 13+ messages in thread
From: Haneen Mohammed @ 2017-09-21 21:04 UTC (permalink / raw)
To: outreachy-kernel
Cc: dri-devel, Daniel Vetter, Jani Nikula, Sean Paul, David Airlie, gregkh
Remove obsolete comment which was initially added in 2008 to annotate
that idr_find() was used before idr_remove() since idr_remove() didn't
use to return feedback. The comment now is irrelevant with
commit f6cd7daecff5 ("drm: Release driver references to handle before
making it available again").
Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
---
drivers/gpu/drm/drm_gem.c | 9 ---------
1 file changed, 9 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index c55f338..b9bddaa 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
{
struct drm_gem_object *obj;
- /* This is gross. The idr system doesn't let us try a delete and
- * return an error code. It just spews if you fail at deleting.
- * So, we have to grab a lock around finding the object and then
- * doing the delete on it and dropping the refcount, or the user
- * could race us to double-decrement the refcount and cause a
- * use-after-free later. Given the frequency of our handle lookups,
- * we may want to use ida for number allocation and a hash table
- * for the pointers, anyway.
- */
spin_lock(&filp->table_lock);
/* Check if we currently have a reference on the object */
--
2.7.4
^ permalink raw reply related [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
2017-09-21 21:04 ` Haneen Mohammed
@ 2017-09-21 21:16 ` Julia Lawall
-1 siblings, 0 replies; 13+ messages in thread
From: Julia Lawall @ 2017-09-21 21:16 UTC (permalink / raw)
To: Haneen Mohammed; +Cc: gregkh, outreachy-kernel, dri-devel, Daniel Vetter
On Thu, 21 Sep 2017, Haneen Mohammed wrote:
> Remove obsolete comment which was initially added in 2008 to annotate
> that idr_find() was used before idr_remove() since idr_remove() didn't
> use to return feedback. The comment now is irrelevant with
> commit f6cd7daecff5 ("drm: Release driver references to handle before
> making it available again").
Why did you send it again?
julia
>
> Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
> ---
> drivers/gpu/drm/drm_gem.c | 9 ---------
> 1 file changed, 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index c55f338..b9bddaa 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> {
> struct drm_gem_object *obj;
>
> - /* This is gross. The idr system doesn't let us try a delete and
> - * return an error code. It just spews if you fail at deleting.
> - * So, we have to grab a lock around finding the object and then
> - * doing the delete on it and dropping the refcount, or the user
> - * could race us to double-decrement the refcount and cause a
> - * use-after-free later. Given the frequency of our handle lookups,
> - * we may want to use ida for number allocation and a hash table
> - * for the pointers, anyway.
> - */
> spin_lock(&filp->table_lock);
>
> /* Check if we currently have a reference on the object */
> --
> 2.7.4
>
> --
> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> To post to this group, send email to outreachy-kernel@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> For more options, visit https://groups.google.com/d/optout.
>
_______________________________________________
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https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
@ 2017-09-21 21:16 ` Julia Lawall
0 siblings, 0 replies; 13+ messages in thread
From: Julia Lawall @ 2017-09-21 21:16 UTC (permalink / raw)
To: Haneen Mohammed
Cc: outreachy-kernel, dri-devel, Daniel Vetter, Jani Nikula,
Sean Paul, David Airlie, gregkh
On Thu, 21 Sep 2017, Haneen Mohammed wrote:
> Remove obsolete comment which was initially added in 2008 to annotate
> that idr_find() was used before idr_remove() since idr_remove() didn't
> use to return feedback. The comment now is irrelevant with
> commit f6cd7daecff5 ("drm: Release driver references to handle before
> making it available again").
Why did you send it again?
julia
>
> Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
> ---
> drivers/gpu/drm/drm_gem.c | 9 ---------
> 1 file changed, 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index c55f338..b9bddaa 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> {
> struct drm_gem_object *obj;
>
> - /* This is gross. The idr system doesn't let us try a delete and
> - * return an error code. It just spews if you fail at deleting.
> - * So, we have to grab a lock around finding the object and then
> - * doing the delete on it and dropping the refcount, or the user
> - * could race us to double-decrement the refcount and cause a
> - * use-after-free later. Given the frequency of our handle lookups,
> - * we may want to use ida for number allocation and a hash table
> - * for the pointers, anyway.
> - */
> spin_lock(&filp->table_lock);
>
> /* Check if we currently have a reference on the object */
> --
> 2.7.4
>
> --
> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> To post to this group, send email to outreachy-kernel@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> For more options, visit https://groups.google.com/d/optout.
>
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
2017-09-21 21:16 ` Julia Lawall
@ 2017-09-21 21:47 ` Haneen Mohammed
-1 siblings, 0 replies; 13+ messages in thread
From: Haneen Mohammed @ 2017-09-21 21:47 UTC (permalink / raw)
To: Julia Lawall; +Cc: gregkh, outreachy-kernel, dri-devel, Daniel Vetter
On Thu, Sep 21, 2017 at 11:16:44PM +0200, Julia Lawall wrote:
>
>
> On Thu, 21 Sep 2017, Haneen Mohammed wrote:
>
> > Remove obsolete comment which was initially added in 2008 to annotate
> > that idr_find() was used before idr_remove() since idr_remove() didn't
> > use to return feedback. The comment now is irrelevant with
> > commit f6cd7daecff5 ("drm: Release driver references to handle before
> > making it available again").
>
> Why did you send it again?
>
> julia
>
I forgot to include the dri-devel mailing list for the first patch.
Haneen
> >
> > Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
> > ---
> > drivers/gpu/drm/drm_gem.c | 9 ---------
> > 1 file changed, 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > index c55f338..b9bddaa 100644
> > --- a/drivers/gpu/drm/drm_gem.c
> > +++ b/drivers/gpu/drm/drm_gem.c
> > @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> > {
> > struct drm_gem_object *obj;
> >
> > - /* This is gross. The idr system doesn't let us try a delete and
> > - * return an error code. It just spews if you fail at deleting.
> > - * So, we have to grab a lock around finding the object and then
> > - * doing the delete on it and dropping the refcount, or the user
> > - * could race us to double-decrement the refcount and cause a
> > - * use-after-free later. Given the frequency of our handle lookups,
> > - * we may want to use ida for number allocation and a hash table
> > - * for the pointers, anyway.
> > - */
> > spin_lock(&filp->table_lock);
> >
> > /* Check if we currently have a reference on the object */
> > --
> > 2.7.4
> >
> > --
> > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> > To post to this group, send email to outreachy-kernel@googlegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> > For more options, visit https://groups.google.com/d/optout.
> >
_______________________________________________
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dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
@ 2017-09-21 21:47 ` Haneen Mohammed
0 siblings, 0 replies; 13+ messages in thread
From: Haneen Mohammed @ 2017-09-21 21:47 UTC (permalink / raw)
To: Julia Lawall
Cc: outreachy-kernel, dri-devel, Daniel Vetter, Jani Nikula,
Sean Paul, David Airlie, gregkh
On Thu, Sep 21, 2017 at 11:16:44PM +0200, Julia Lawall wrote:
>
>
> On Thu, 21 Sep 2017, Haneen Mohammed wrote:
>
> > Remove obsolete comment which was initially added in 2008 to annotate
> > that idr_find() was used before idr_remove() since idr_remove() didn't
> > use to return feedback. The comment now is irrelevant with
> > commit f6cd7daecff5 ("drm: Release driver references to handle before
> > making it available again").
>
> Why did you send it again?
>
> julia
>
I forgot to include the dri-devel mailing list for the first patch.
Haneen
> >
> > Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
> > ---
> > drivers/gpu/drm/drm_gem.c | 9 ---------
> > 1 file changed, 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > index c55f338..b9bddaa 100644
> > --- a/drivers/gpu/drm/drm_gem.c
> > +++ b/drivers/gpu/drm/drm_gem.c
> > @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> > {
> > struct drm_gem_object *obj;
> >
> > - /* This is gross. The idr system doesn't let us try a delete and
> > - * return an error code. It just spews if you fail at deleting.
> > - * So, we have to grab a lock around finding the object and then
> > - * doing the delete on it and dropping the refcount, or the user
> > - * could race us to double-decrement the refcount and cause a
> > - * use-after-free later. Given the frequency of our handle lookups,
> > - * we may want to use ida for number allocation and a hash table
> > - * for the pointers, anyway.
> > - */
> > spin_lock(&filp->table_lock);
> >
> > /* Check if we currently have a reference on the object */
> > --
> > 2.7.4
> >
> > --
> > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> > To post to this group, send email to outreachy-kernel@googlegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> > For more options, visit https://groups.google.com/d/optout.
> >
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
2017-09-21 21:47 ` Haneen Mohammed
@ 2017-09-22 5:59 ` Julia Lawall
-1 siblings, 0 replies; 13+ messages in thread
From: Julia Lawall @ 2017-09-22 5:59 UTC (permalink / raw)
To: Haneen Mohammed; +Cc: gregkh, outreachy-kernel, dri-devel, Daniel Vetter
On Thu, 21 Sep 2017, Haneen Mohammed wrote:
> On Thu, Sep 21, 2017 at 11:16:44PM +0200, Julia Lawall wrote:
> >
> >
> > On Thu, 21 Sep 2017, Haneen Mohammed wrote:
> >
> > > Remove obsolete comment which was initially added in 2008 to annotate
> > > that idr_find() was used before idr_remove() since idr_remove() didn't
> > > use to return feedback. The comment now is irrelevant with
> > > commit f6cd7daecff5 ("drm: Release driver references to handle before
> > > making it available again").
> >
> > Why did you send it again?
> >
> > julia
> >
>
> I forgot to include the dri-devel mailing list for the first patch.
OK, it should have been a v2 with a comment about what changed. Even if
it is not a technical issue, it saves people wondering about what
happened.
julia
>
> Haneen
>
> > >
> > > Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
> > > ---
> > > drivers/gpu/drm/drm_gem.c | 9 ---------
> > > 1 file changed, 9 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > > index c55f338..b9bddaa 100644
> > > --- a/drivers/gpu/drm/drm_gem.c
> > > +++ b/drivers/gpu/drm/drm_gem.c
> > > @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> > > {
> > > struct drm_gem_object *obj;
> > >
> > > - /* This is gross. The idr system doesn't let us try a delete and
> > > - * return an error code. It just spews if you fail at deleting.
> > > - * So, we have to grab a lock around finding the object and then
> > > - * doing the delete on it and dropping the refcount, or the user
> > > - * could race us to double-decrement the refcount and cause a
> > > - * use-after-free later. Given the frequency of our handle lookups,
> > > - * we may want to use ida for number allocation and a hash table
> > > - * for the pointers, anyway.
> > > - */
> > > spin_lock(&filp->table_lock);
> > >
> > > /* Check if we currently have a reference on the object */
> > > --
> > > 2.7.4
> > >
> > > --
> > > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> > > To post to this group, send email to outreachy-kernel@googlegroups.com.
> > > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> > > For more options, visit https://groups.google.com/d/optout.
> > >
>
> --
> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> To post to this group, send email to outreachy-kernel@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921214707.GA22325%40Haneen.
> For more options, visit https://groups.google.com/d/optout.
>
_______________________________________________
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https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
@ 2017-09-22 5:59 ` Julia Lawall
0 siblings, 0 replies; 13+ messages in thread
From: Julia Lawall @ 2017-09-22 5:59 UTC (permalink / raw)
To: Haneen Mohammed
Cc: outreachy-kernel, dri-devel, Daniel Vetter, Jani Nikula,
Sean Paul, David Airlie, gregkh
On Thu, 21 Sep 2017, Haneen Mohammed wrote:
> On Thu, Sep 21, 2017 at 11:16:44PM +0200, Julia Lawall wrote:
> >
> >
> > On Thu, 21 Sep 2017, Haneen Mohammed wrote:
> >
> > > Remove obsolete comment which was initially added in 2008 to annotate
> > > that idr_find() was used before idr_remove() since idr_remove() didn't
> > > use to return feedback. The comment now is irrelevant with
> > > commit f6cd7daecff5 ("drm: Release driver references to handle before
> > > making it available again").
> >
> > Why did you send it again?
> >
> > julia
> >
>
> I forgot to include the dri-devel mailing list for the first patch.
OK, it should have been a v2 with a comment about what changed. Even if
it is not a technical issue, it saves people wondering about what
happened.
julia
>
> Haneen
>
> > >
> > > Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
> > > ---
> > > drivers/gpu/drm/drm_gem.c | 9 ---------
> > > 1 file changed, 9 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > > index c55f338..b9bddaa 100644
> > > --- a/drivers/gpu/drm/drm_gem.c
> > > +++ b/drivers/gpu/drm/drm_gem.c
> > > @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> > > {
> > > struct drm_gem_object *obj;
> > >
> > > - /* This is gross. The idr system doesn't let us try a delete and
> > > - * return an error code. It just spews if you fail at deleting.
> > > - * So, we have to grab a lock around finding the object and then
> > > - * doing the delete on it and dropping the refcount, or the user
> > > - * could race us to double-decrement the refcount and cause a
> > > - * use-after-free later. Given the frequency of our handle lookups,
> > > - * we may want to use ida for number allocation and a hash table
> > > - * for the pointers, anyway.
> > > - */
> > > spin_lock(&filp->table_lock);
> > >
> > > /* Check if we currently have a reference on the object */
> > > --
> > > 2.7.4
> > >
> > > --
> > > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> > > To post to this group, send email to outreachy-kernel@googlegroups.com.
> > > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> > > For more options, visit https://groups.google.com/d/optout.
> > >
>
> --
> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> To post to this group, send email to outreachy-kernel@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921214707.GA22325%40Haneen.
> For more options, visit https://groups.google.com/d/optout.
>
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
2017-09-22 5:59 ` Julia Lawall
(?)
@ 2017-09-23 2:07 ` Haneen Mohammed
-1 siblings, 0 replies; 13+ messages in thread
From: Haneen Mohammed @ 2017-09-23 2:07 UTC (permalink / raw)
To: Julia Lawall; +Cc: outreachy-kernel
On Fri, Sep 22, 2017 at 07:59:36AM +0200, Julia Lawall wrote:
>
>
> On Thu, 21 Sep 2017, Haneen Mohammed wrote:
>
> > On Thu, Sep 21, 2017 at 11:16:44PM +0200, Julia Lawall wrote:
> > >
> > >
> > > On Thu, 21 Sep 2017, Haneen Mohammed wrote:
> > >
> > > > Remove obsolete comment which was initially added in 2008 to annotate
> > > > that idr_find() was used before idr_remove() since idr_remove() didn't
> > > > use to return feedback. The comment now is irrelevant with
> > > > commit f6cd7daecff5 ("drm: Release driver references to handle before
> > > > making it available again").
> > >
> > > Why did you send it again?
> > >
> > > julia
> > >
> >
> > I forgot to include the dri-devel mailing list for the first patch.
>
> OK, it should have been a v2 with a comment about what changed. Even if
> it is not a technical issue, it saves people wondering about what
> happened.
>
> julia
I see. I thought only if I introduced a change to the patch I should make
a new version. Thank you, I will take this into account next time!
-Haneen
>
> >
> > Haneen
> >
> > > >
> > > > Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
> > > > ---
> > > > drivers/gpu/drm/drm_gem.c | 9 ---------
> > > > 1 file changed, 9 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > > > index c55f338..b9bddaa 100644
> > > > --- a/drivers/gpu/drm/drm_gem.c
> > > > +++ b/drivers/gpu/drm/drm_gem.c
> > > > @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> > > > {
> > > > struct drm_gem_object *obj;
> > > >
> > > > - /* This is gross. The idr system doesn't let us try a delete and
> > > > - * return an error code. It just spews if you fail at deleting.
> > > > - * So, we have to grab a lock around finding the object and then
> > > > - * doing the delete on it and dropping the refcount, or the user
> > > > - * could race us to double-decrement the refcount and cause a
> > > > - * use-after-free later. Given the frequency of our handle lookups,
> > > > - * we may want to use ida for number allocation and a hash table
> > > > - * for the pointers, anyway.
> > > > - */
> > > > spin_lock(&filp->table_lock);
> > > >
> > > > /* Check if we currently have a reference on the object */
> > > > --
> > > > 2.7.4
> > > >
> > > > --
> > > > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > > > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> > > > To post to this group, send email to outreachy-kernel@googlegroups.com.
> > > > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> > > > For more options, visit https://groups.google.com/d/optout.
> > > >
> >
> > --
> > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> > To post to this group, send email to outreachy-kernel@googlegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921214707.GA22325%40Haneen.
> > For more options, visit https://groups.google.com/d/optout.
> >
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
2017-09-21 21:04 ` Haneen Mohammed
@ 2017-09-26 5:24 ` Daniel Vetter
-1 siblings, 0 replies; 13+ messages in thread
From: Daniel Vetter @ 2017-09-26 5:24 UTC (permalink / raw)
To: Haneen Mohammed; +Cc: gregkh, outreachy-kernel, dri-devel, Daniel Vetter
On Thu, Sep 21, 2017 at 03:04:24PM -0600, Haneen Mohammed wrote:
> Remove obsolete comment which was initially added in 2008 to annotate
> that idr_find() was used before idr_remove() since idr_remove() didn't
> use to return feedback. The comment now is irrelevant with
> commit f6cd7daecff5 ("drm: Release driver references to handle before
> making it available again").
Personally I'd have added a lot more of the research story you've detailed
in the private mails, just to show the work you've done. But the terse
version is ok too ofc.
> Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
Applied to drm-misc-next, thanks.
-Daniel
> ---
> drivers/gpu/drm/drm_gem.c | 9 ---------
> 1 file changed, 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index c55f338..b9bddaa 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> {
> struct drm_gem_object *obj;
>
> - /* This is gross. The idr system doesn't let us try a delete and
> - * return an error code. It just spews if you fail at deleting.
> - * So, we have to grab a lock around finding the object and then
> - * doing the delete on it and dropping the refcount, or the user
> - * could race us to double-decrement the refcount and cause a
> - * use-after-free later. Given the frequency of our handle lookups,
> - * we may want to use ida for number allocation and a hash table
> - * for the pointers, anyway.
> - */
> spin_lock(&filp->table_lock);
>
> /* Check if we currently have a reference on the object */
> --
> 2.7.4
>
> --
> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> To post to this group, send email to outreachy-kernel@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> For more options, visit https://groups.google.com/d/optout.
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
@ 2017-09-26 5:24 ` Daniel Vetter
0 siblings, 0 replies; 13+ messages in thread
From: Daniel Vetter @ 2017-09-26 5:24 UTC (permalink / raw)
To: Haneen Mohammed
Cc: outreachy-kernel, dri-devel, Daniel Vetter, Jani Nikula,
Sean Paul, David Airlie, gregkh
On Thu, Sep 21, 2017 at 03:04:24PM -0600, Haneen Mohammed wrote:
> Remove obsolete comment which was initially added in 2008 to annotate
> that idr_find() was used before idr_remove() since idr_remove() didn't
> use to return feedback. The comment now is irrelevant with
> commit f6cd7daecff5 ("drm: Release driver references to handle before
> making it available again").
Personally I'd have added a lot more of the research story you've detailed
in the private mails, just to show the work you've done. But the terse
version is ok too ofc.
> Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
Applied to drm-misc-next, thanks.
-Daniel
> ---
> drivers/gpu/drm/drm_gem.c | 9 ---------
> 1 file changed, 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index c55f338..b9bddaa 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> {
> struct drm_gem_object *obj;
>
> - /* This is gross. The idr system doesn't let us try a delete and
> - * return an error code. It just spews if you fail at deleting.
> - * So, we have to grab a lock around finding the object and then
> - * doing the delete on it and dropping the refcount, or the user
> - * could race us to double-decrement the refcount and cause a
> - * use-after-free later. Given the frequency of our handle lookups,
> - * we may want to use ida for number allocation and a hash table
> - * for the pointers, anyway.
> - */
> spin_lock(&filp->table_lock);
>
> /* Check if we currently have a reference on the object */
> --
> 2.7.4
>
> --
> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> To post to this group, send email to outreachy-kernel@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> For more options, visit https://groups.google.com/d/optout.
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
2017-09-26 5:24 ` Daniel Vetter
@ 2017-09-26 20:15 ` Haneen Mohammed
-1 siblings, 0 replies; 13+ messages in thread
From: Haneen Mohammed @ 2017-09-26 20:15 UTC (permalink / raw)
To: Daniel Vetter; +Cc: gregkh, outreachy-kernel, dri-devel, Daniel Vetter
On Tue, Sep 26, 2017 at 07:24:38AM +0200, Daniel Vetter wrote:
> On Thu, Sep 21, 2017 at 03:04:24PM -0600, Haneen Mohammed wrote:
> > Remove obsolete comment which was initially added in 2008 to annotate
> > that idr_find() was used before idr_remove() since idr_remove() didn't
> > use to return feedback. The comment now is irrelevant with
> > commit f6cd7daecff5 ("drm: Release driver references to handle before
> > making it available again").
>
> Personally I'd have added a lot more of the research story you've detailed
> in the private mails, just to show the work you've done. But the terse
> version is ok too ofc.
>
> > Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
>
> Applied to drm-misc-next, thanks.
> -Daniel
>
My bad, I was afraid to add too much details as I always read commit
message should be concise that I then ended up with too little.
I will try next time to add the necessary information.
Thank you!
Haneen
> > ---
> > drivers/gpu/drm/drm_gem.c | 9 ---------
> > 1 file changed, 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > index c55f338..b9bddaa 100644
> > --- a/drivers/gpu/drm/drm_gem.c
> > +++ b/drivers/gpu/drm/drm_gem.c
> > @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> > {
> > struct drm_gem_object *obj;
> >
> > - /* This is gross. The idr system doesn't let us try a delete and
> > - * return an error code. It just spews if you fail at deleting.
> > - * So, we have to grab a lock around finding the object and then
> > - * doing the delete on it and dropping the refcount, or the user
> > - * could race us to double-decrement the refcount and cause a
> > - * use-after-free later. Given the frequency of our handle lookups,
> > - * we may want to use ida for number allocation and a hash table
> > - * for the pointers, anyway.
> > - */
> > spin_lock(&filp->table_lock);
> >
> > /* Check if we currently have a reference on the object */
> > --
> > 2.7.4
> >
> > --
> > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> > To post to this group, send email to outreachy-kernel@googlegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> > For more options, visit https://groups.google.com/d/optout.
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment
@ 2017-09-26 20:15 ` Haneen Mohammed
0 siblings, 0 replies; 13+ messages in thread
From: Haneen Mohammed @ 2017-09-26 20:15 UTC (permalink / raw)
To: Daniel Vetter
Cc: outreachy-kernel, dri-devel, Daniel Vetter, Jani Nikula,
Sean Paul, David Airlie, gregkh
On Tue, Sep 26, 2017 at 07:24:38AM +0200, Daniel Vetter wrote:
> On Thu, Sep 21, 2017 at 03:04:24PM -0600, Haneen Mohammed wrote:
> > Remove obsolete comment which was initially added in 2008 to annotate
> > that idr_find() was used before idr_remove() since idr_remove() didn't
> > use to return feedback. The comment now is irrelevant with
> > commit f6cd7daecff5 ("drm: Release driver references to handle before
> > making it available again").
>
> Personally I'd have added a lot more of the research story you've detailed
> in the private mails, just to show the work you've done. But the terse
> version is ok too ofc.
>
> > Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
>
> Applied to drm-misc-next, thanks.
> -Daniel
>
My bad, I was afraid to add too much details as I always read commit
message should be concise that I then ended up with too little.
I will try next time to add the necessary information.
Thank you!
Haneen
> > ---
> > drivers/gpu/drm/drm_gem.c | 9 ---------
> > 1 file changed, 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > index c55f338..b9bddaa 100644
> > --- a/drivers/gpu/drm/drm_gem.c
> > +++ b/drivers/gpu/drm/drm_gem.c
> > @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> > {
> > struct drm_gem_object *obj;
> >
> > - /* This is gross. The idr system doesn't let us try a delete and
> > - * return an error code. It just spews if you fail at deleting.
> > - * So, we have to grab a lock around finding the object and then
> > - * doing the delete on it and dropping the refcount, or the user
> > - * could race us to double-decrement the refcount and cause a
> > - * use-after-free later. Given the frequency of our handle lookups,
> > - * we may want to use ida for number allocation and a hash table
> > - * for the pointers, anyway.
> > - */
> > spin_lock(&filp->table_lock);
> >
> > /* Check if we currently have a reference on the object */
> > --
> > 2.7.4
> >
> > --
> > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> > To post to this group, send email to outreachy-kernel@googlegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20170921210424.GA21951%40Haneen.
> > For more options, visit https://groups.google.com/d/optout.
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
^ permalink raw reply [flat|nested] 13+ messages in thread
end of thread, other threads:[~2017-09-26 20:15 UTC | newest]
Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-09-21 21:04 [RESEND PATCH] drm: Remove obsolete "This is gross" comment Haneen Mohammed
2017-09-21 21:04 ` Haneen Mohammed
2017-09-21 21:16 ` [Outreachy kernel] " Julia Lawall
2017-09-21 21:16 ` Julia Lawall
2017-09-21 21:47 ` Haneen Mohammed
2017-09-21 21:47 ` Haneen Mohammed
2017-09-22 5:59 ` Julia Lawall
2017-09-22 5:59 ` Julia Lawall
2017-09-23 2:07 ` Haneen Mohammed
2017-09-26 5:24 ` Daniel Vetter
2017-09-26 5:24 ` Daniel Vetter
2017-09-26 20:15 ` Haneen Mohammed
2017-09-26 20:15 ` Haneen Mohammed
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