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Thu, 30 Apr 2026 13:00:39 -0700 (PDT) Date: Thu, 30 Apr 2026 22:00:37 +0200 From: Osama Abdelkader To: Luca Ceresoli Cc: Peter Senna Tschudin , Ian Ray , Martyn Welch , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Archit Taneja , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v3 3/3] drm/bridge: megachips: remove bridge when irq request fails Message-ID: References: <20260423200622.325076-1-osama.abdelkader@gmail.com> <20260423200622.325076-3-osama.abdelkader@gmail.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hello Luca, On Wed, Apr 29, 2026 at 01:48:33PM +0200, Luca Ceresoli wrote: > On Thu Apr 23, 2026 at 10:06 PM CEST, Osama Abdelkader wrote: > > If devm_request_threaded_irq() fails after drm_bridge_add(), remove the > > bridge before returning. > > > > Keep drm_bridge_add() rather than devm_drm_bridge_add(): registration is > > tied to the STDP4028 device while ge_b850v3_register() may complete from > > either I2C probe; devm would not unwind the bridge if the other client's > > probe fails. > > > > Signed-off-by: Osama Abdelkader > > Fixes: a68ee76f4a28 ("drm/bridge: megachips-stdpxxxx-ge-b850v3-fw: Fix bridge initialization") > > That commit only moved the bug to a slightly different location. The bug > was present even before, since commit fcfa0ddc18ed ("drm/bridge: Drivers > for megachips-stdpxxxx-ge-b850v3-fw (LVDS-DP++)"), so you should update > your Fixes line to point to it. Updated in v4, thanks. > > > > Cc: stable@vger.kernel.org > > --- > > v3: add Fixes and Cc tags > > v2: IRQ failure path only (explicit drm_bridge_remove) > > --- > > .../drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 16 ++++++++++------ > > 1 file changed, 10 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c > > index c9e6505cbd88..2d02cc69f237 100644 > > --- a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c > > +++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c > > @@ -251,7 +251,6 @@ static void ge_b850v3_lvds_remove(void) > > goto out; > > > > drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge); > > - > > ge_b850v3_lvds_ptr = NULL; > > out: > > mutex_unlock(&ge_b850v3_lvds_dev_mutex); > > @@ -261,6 +260,7 @@ static int ge_b850v3_register(void) > > { > > struct i2c_client *stdp4028_i2c = ge_b850v3_lvds_ptr->stdp4028_i2c; > > struct device *dev = &stdp4028_i2c->dev; > > + int ret; > > > > /* drm bridge initialization */ > > ge_b850v3_lvds_ptr->bridge.ops = DRM_BRIDGE_OP_DETECT | > > @@ -277,11 +277,15 @@ static int ge_b850v3_register(void) > > if (!stdp4028_i2c->irq) > > return 0; > > > > - return devm_request_threaded_irq(&stdp4028_i2c->dev, > > - stdp4028_i2c->irq, NULL, > > - ge_b850v3_lvds_irq_handler, > > - IRQF_TRIGGER_HIGH | IRQF_ONESHOT, > > - "ge-b850v3-lvds-dp", ge_b850v3_lvds_ptr); > > + ret = devm_request_threaded_irq(&stdp4028_i2c->dev, > > + stdp4028_i2c->irq, NULL, > > + ge_b850v3_lvds_irq_handler, > > + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, > > + "ge-b850v3-lvds-dp", ge_b850v3_lvds_ptr); > > + if (ret) > > + drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge); > > Why not just using devm_drm_bridge_add() and keep everything else clean, as > you did in other patches in the series? Because registration is tied to the STDP4028 device while ge_b850v3_register() may complete from either I2C probe; so devm would not unwind the bridge if the other client's probe fails. > > Luca > > -- > Luca Ceresoli, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com