From: Harry Wentland <harry.wentland@amd.com> To: Insu Yun <wuninsu@gmail.com>, <airlied@linux.ie>, <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org> Cc: <yeongjin.jang@gatech.edu>, <taesoo@gatech.edu>, <insu@gatech.edu>, <changwoo@gatech.edu>, "Lysenko, Mykola" <Mykola.Lysenko@amd.com>, "Deucher, Alexander" <Alexander.Deucher@amd.com> Subject: Re: [PATCH] drm: fix missing reference counting decrease Date: Tue, 9 Feb 2016 09:48:35 -0500 [thread overview] Message-ID: <56B9FC43.3040407@amd.com> (raw) In-Reply-To: <1454342909-15327-1-git-send-email-wuninsu@gmail.com> [-- Attachment #1: Type: text/plain, Size: 1048 bytes --] This looks good but we should probably do the same for all return paths when reference for port has been acquired. Please see attached patch. Thanks, Harry On 2016-02-01 11:08 AM, Insu Yun wrote: > In drm_dp_mst_allocate_vcpi, it returns true in two paths, > but in one path, there is no reference couting decrease. > > Signed-off-by: Insu Yun <wuninsu@gmail.com> > --- > drivers/gpu/drm/drm_dp_mst_topology.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index 6ed90a2..fe273b6 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -2446,6 +2446,7 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp > DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); > if (pbn == port->vcpi.pbn) { > *slots = port->vcpi.num_slots; > + drm_dp_put_port(port); > return true; > } > } [-- Attachment #2: 0001-drm-dp-mst-Fix-missing-ref-count-decrease.patch --] [-- Type: text/x-patch, Size: 1441 bytes --] >From a6d4dc6206f06a3d1acc05ea5bf3b4885cc96a0a Mon Sep 17 00:00:00 2001 From: Harry Wentland <harry.wentland@amd.com> Date: Tue, 9 Feb 2016 09:33:11 -0500 Subject: [PATCH] drm/dp/mst: Fix missing ref count decrease Decrease ref count for port on all exit conditions. Signed-off-by: Harry Wentland <harry.wentland@amd.com> Reviewed-by: Mykola Lysenko <mykola.lysenko@amd.com> --- drivers/gpu/drm/drm_dp_mst_topology.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 5662e68ecccd..fa50fd0cb5ef 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2498,7 +2498,8 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); if (pbn == port->vcpi.pbn) { *slots = port->vcpi.num_slots; - return true; + ret = 0; + goto out; } } @@ -2510,10 +2511,10 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); *slots = port->vcpi.num_slots; - drm_dp_put_port(port); - return true; + ret = 0; out: - return false; + drm_dp_put_port(port); + return ret == 0; } EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: Harry Wentland <harry.wentland@amd.com> To: Insu Yun <wuninsu@gmail.com>, airlied@linux.ie, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: yeongjin.jang@gatech.edu, taesoo@gatech.edu, insu@gatech.edu, changwoo@gatech.edu, "Deucher, Alexander" <Alexander.Deucher@amd.com>, "Lysenko, Mykola" <Mykola.Lysenko@amd.com> Subject: Re: [PATCH] drm: fix missing reference counting decrease Date: Tue, 9 Feb 2016 09:48:35 -0500 [thread overview] Message-ID: <56B9FC43.3040407@amd.com> (raw) In-Reply-To: <1454342909-15327-1-git-send-email-wuninsu@gmail.com> [-- Attachment #1: Type: text/plain, Size: 1048 bytes --] This looks good but we should probably do the same for all return paths when reference for port has been acquired. Please see attached patch. Thanks, Harry On 2016-02-01 11:08 AM, Insu Yun wrote: > In drm_dp_mst_allocate_vcpi, it returns true in two paths, > but in one path, there is no reference couting decrease. > > Signed-off-by: Insu Yun <wuninsu@gmail.com> > --- > drivers/gpu/drm/drm_dp_mst_topology.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index 6ed90a2..fe273b6 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -2446,6 +2446,7 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp > DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); > if (pbn == port->vcpi.pbn) { > *slots = port->vcpi.num_slots; > + drm_dp_put_port(port); > return true; > } > } [-- Attachment #2: 0001-drm-dp-mst-Fix-missing-ref-count-decrease.patch --] [-- Type: text/x-patch, Size: 1441 bytes --] >From a6d4dc6206f06a3d1acc05ea5bf3b4885cc96a0a Mon Sep 17 00:00:00 2001 From: Harry Wentland <harry.wentland@amd.com> Date: Tue, 9 Feb 2016 09:33:11 -0500 Subject: [PATCH] drm/dp/mst: Fix missing ref count decrease Decrease ref count for port on all exit conditions. Signed-off-by: Harry Wentland <harry.wentland@amd.com> Reviewed-by: Mykola Lysenko <mykola.lysenko@amd.com> --- drivers/gpu/drm/drm_dp_mst_topology.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 5662e68ecccd..fa50fd0cb5ef 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2498,7 +2498,8 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); if (pbn == port->vcpi.pbn) { *slots = port->vcpi.num_slots; - return true; + ret = 0; + goto out; } } @@ -2510,10 +2511,10 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); *slots = port->vcpi.num_slots; - drm_dp_put_port(port); - return true; + ret = 0; out: - return false; + drm_dp_put_port(port); + return ret == 0; } EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); -- 2.1.4 [-- Attachment #3: Type: text/plain, Size: 160 bytes --] _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2016-02-09 16:22 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-02-01 16:08 [PATCH] drm: fix missing reference counting decrease Insu Yun 2016-02-09 14:48 ` Harry Wentland [this message] 2016-02-09 14:48 ` Harry Wentland 2016-02-09 16:07 ` Insu Yun
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