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Wed, 17 Jan 2024 11:39:07 -0800 (PST) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240117103502.1.Ib726a0184913925efc7e99c4d4fc801982e1bc24@changeid> In-Reply-To: <20240117103502.1.Ib726a0184913925efc7e99c4d4fc801982e1bc24@changeid> From: Hsin-Yi Wang Date: Wed, 17 Jan 2024 11:38:41 -0800 Message-ID: Subject: Re: [PATCH] drm/bridge: parade-ps8640: Make sure we drop the AUX mutex in the error case To: Douglas Anderson Cc: dri-devel@lists.freedesktop.org, Andrzej Hajda , Daniel Vetter , David Airlie , Jernej Skrabec , Jonas Karlman , Laurent Pinchart , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Pin-yen Lin , Robert Foss , Thomas Zimmermann , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, Jan 17, 2024 at 10:35=E2=80=AFAM Douglas Anderson wrote: > > After commit 26db46bc9c67 ("drm/bridge: parade-ps8640: Ensure bridge > is suspended in .post_disable()"), if we hit the error case in > ps8640_aux_transfer() then we return without dropping the mutex. Fix > this oversight. > > Fixes: 26db46bc9c67 ("drm/bridge: parade-ps8640: Ensure bridge is suspend= ed in .post_disable()") > Signed-off-by: Douglas Anderson > --- > Sorry for missing this in my review! :( Given that this is really > simple and I'd rather the buggy commit not be there for long, if I can > get a quick Reviewed-by tag on this patch I'll land it without the > typical stewing period. > Reviewed-by: Hsin-Yi Wang > drivers/gpu/drm/bridge/parade-ps8640.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bri= dge/parade-ps8640.c > index 166bfc725ef4..14d4dcf239da 100644 > --- a/drivers/gpu/drm/bridge/parade-ps8640.c > +++ b/drivers/gpu/drm/bridge/parade-ps8640.c > @@ -351,11 +351,13 @@ static ssize_t ps8640_aux_transfer(struct drm_dp_au= x *aux, > ret =3D _ps8640_wait_hpd_asserted(ps_bridge, 200 * 1000); > if (ret) { > pm_runtime_put_sync_suspend(dev); > - return ret; > + goto exit; > } > ret =3D ps8640_aux_transfer_msg(aux, msg); > pm_runtime_mark_last_busy(dev); > pm_runtime_put_autosuspend(dev); > + > +exit: > mutex_unlock(&ps_bridge->aux_lock); > > return ret; > -- > 2.43.0.381.gb435a96ce8-goog >