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[34.145.178.123]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6b08bf006f4sm6392076d6.90.2024.06.11.04.03.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Jun 2024 04:03:04 -0700 (PDT) From: Ricardo Ribalda Date: Tue, 11 Jun 2024 11:02:57 +0000 Subject: [PATCH 1/2] media: drivers/media/dvb-core: Split dvb_frontend_open() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240611-coccinelle-followup-v1-1-df2de9c2f320@chromium.org> References: <20240611-coccinelle-followup-v1-0-df2de9c2f320@chromium.org> In-Reply-To: <20240611-coccinelle-followup-v1-0-df2de9c2f320@chromium.org> To: Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Hans Verkuil , Ricardo Ribalda X-Mailer: b4 0.13.0 Move the actual opening to its own function. Not intended code change. This is a preparation for the next patch. Signed-off-by: Ricardo Ribalda --- drivers/media/dvb-core/dvb_frontend.c | 143 +++++++++++++++++-------------= ---- 1 file changed, 70 insertions(+), 73 deletions(-) diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core= /dvb_frontend.c index 4f78f30b3646..e81b9996530e 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -2760,80 +2760,13 @@ static __poll_t dvb_frontend_poll(struct file *file= , struct poll_table_struct *w return 0; } =20 -static int dvb_frontend_open(struct inode *inode, struct file *file) +static int __dvb_frontend_open(struct inode *inode, struct file *file) { struct dvb_device *dvbdev =3D file->private_data; struct dvb_frontend *fe =3D dvbdev->priv; struct dvb_frontend_private *fepriv =3D fe->frontend_priv; - struct dvb_adapter *adapter =3D fe->dvb; int ret; =20 - dev_dbg(fe->dvb->device, "%s:\n", __func__); - if (fe->exit =3D=3D DVB_FE_DEVICE_REMOVED) - return -ENODEV; - - if (adapter->mfe_shared =3D=3D 2) { - mutex_lock(&adapter->mfe_lock); - if ((file->f_flags & O_ACCMODE) !=3D O_RDONLY) { - if (adapter->mfe_dvbdev && - !adapter->mfe_dvbdev->writers) { - mutex_unlock(&adapter->mfe_lock); - return -EBUSY; - } - adapter->mfe_dvbdev =3D dvbdev; - } - } else if (adapter->mfe_shared) { - mutex_lock(&adapter->mfe_lock); - - if (!adapter->mfe_dvbdev) - adapter->mfe_dvbdev =3D dvbdev; - - else if (adapter->mfe_dvbdev !=3D dvbdev) { - struct dvb_device - *mfedev =3D adapter->mfe_dvbdev; - struct dvb_frontend - *mfe =3D mfedev->priv; - struct dvb_frontend_private - *mfepriv =3D mfe->frontend_priv; - int mferetry =3D (dvb_mfe_wait_time << 1); - - mutex_unlock(&adapter->mfe_lock); - while (mferetry-- && (mfedev->users !=3D -1 || - mfepriv->thread)) { - if (msleep_interruptible(500)) { - if (signal_pending(current)) - return -EINTR; - } - } - - mutex_lock(&adapter->mfe_lock); - if (adapter->mfe_dvbdev !=3D dvbdev) { - mfedev =3D adapter->mfe_dvbdev; - mfe =3D mfedev->priv; - mfepriv =3D mfe->frontend_priv; - if (mfedev->users !=3D -1 || - mfepriv->thread) { - mutex_unlock(&adapter->mfe_lock); - return -EBUSY; - } - adapter->mfe_dvbdev =3D dvbdev; - } - } - } - - if (dvbdev->users =3D=3D -1 && fe->ops.ts_bus_ctrl) { - if ((ret =3D fe->ops.ts_bus_ctrl(fe, 1)) < 0) - goto err0; - - /* If we took control of the bus, we need to force - reinitialization. This is because many ts_bus_ctrl() - functions strobe the RESET pin on the demod, and if the - frontend thread already exists then the dvb_init() routine - won't get called (which is what usually does initial - register configuration). */ - fepriv->reinitialise =3D 1; - } - if ((ret =3D dvb_generic_open(inode, file)) < 0) goto err1; =20 @@ -2871,8 +2804,6 @@ static int dvb_frontend_open(struct inode *inode, str= uct file *file) =20 dvb_frontend_get(fe); =20 - if (adapter->mfe_shared) - mutex_unlock(&adapter->mfe_lock); return ret; =20 err3: @@ -2891,9 +2822,75 @@ static int dvb_frontend_open(struct inode *inode, st= ruct file *file) err1: if (dvbdev->users =3D=3D -1 && fe->ops.ts_bus_ctrl) fe->ops.ts_bus_ctrl(fe, 0); -err0: - if (adapter->mfe_shared) - mutex_unlock(&adapter->mfe_lock); + + return ret; +} + +static int dvb_frontend_open(struct inode *inode, struct file *file) +{ + struct dvb_device *dvbdev =3D file->private_data; + struct dvb_frontend *fe =3D dvbdev->priv; + struct dvb_adapter *adapter =3D fe->dvb; + int ret; + + dev_dbg(fe->dvb->device, "%s:\n", __func__); + if (fe->exit =3D=3D DVB_FE_DEVICE_REMOVED) + return -ENODEV; + + if (!adapter->mfe_shared) + return __dvb_frontend_open(inode, file); + + if (adapter->mfe_shared =3D=3D 2) { + mutex_lock(&adapter->mfe_lock); + if ((file->f_flags & O_ACCMODE) !=3D O_RDONLY) { + if (adapter->mfe_dvbdev && + !adapter->mfe_dvbdev->writers) { + mutex_unlock(&adapter->mfe_lock); + return -EBUSY; + } + adapter->mfe_dvbdev =3D dvbdev; + } + } else { + mutex_lock(&adapter->mfe_lock); + + if (!adapter->mfe_dvbdev) { + adapter->mfe_dvbdev =3D dvbdev; + } else if (adapter->mfe_dvbdev !=3D dvbdev) { + struct dvb_device + *mfedev =3D adapter->mfe_dvbdev; + struct dvb_frontend + *mfe =3D mfedev->priv; + struct dvb_frontend_private + *mfepriv =3D mfe->frontend_priv; + int mferetry =3D (dvb_mfe_wait_time << 1); + + mutex_unlock(&adapter->mfe_lock); + while (mferetry-- && (mfedev->users !=3D -1 || + mfepriv->thread)) { + if (msleep_interruptible(500)) { + if (signal_pending(current)) + return -EINTR; + } + } + + mutex_lock(&adapter->mfe_lock); + if (adapter->mfe_dvbdev !=3D dvbdev) { + mfedev =3D adapter->mfe_dvbdev; + mfe =3D mfedev->priv; + mfepriv =3D mfe->frontend_priv; + if (mfedev->users !=3D -1 || + mfepriv->thread) { + mutex_unlock(&adapter->mfe_lock); + return -EBUSY; + } + adapter->mfe_dvbdev =3D dvbdev; + } + } + } + + ret =3D __dvb_frontend_open(inode, file); + mutex_unlock(&adapter->mfe_lock); + return ret; } =20 --=20 2.45.2.505.gda0bf45e8d-goog From nobody Thu Feb 12 15:49:01 2026 Received: from mail-yw1-f176.google.com (mail-yw1-f176.google.com [209.85.128.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8403D17BB24 for ; Tue, 11 Jun 2024 11:03:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718103790; cv=none; b=FCQE4J+s3Ldl96KayXH1T7xaqiREMdiJ3AnbmncnbcNS130hcto5AlSh8D5vx3wJUt40+hT0nuIG5St9QMo2Y/bsbkjltmHOqb37oY+eh/7QDUru6mGUFFBt8RN7gR2BcRY64nb7rOVIom5ROHwRlPwshTp0ZUEY4XH1L5L1nOs= ARC-Message-Signature: i=1; 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[34.145.178.123]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6b08bf006f4sm6392076d6.90.2024.06.11.04.03.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Jun 2024 04:03:05 -0700 (PDT) From: Ricardo Ribalda Date: Tue, 11 Jun 2024 11:02:58 +0000 Subject: [PATCH 2/2] media: drivers/media/dvb-core: Refactor dvb_frontend_open locking Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240611-coccinelle-followup-v1-2-df2de9c2f320@chromium.org> References: <20240611-coccinelle-followup-v1-0-df2de9c2f320@chromium.org> In-Reply-To: <20240611-coccinelle-followup-v1-0-df2de9c2f320@chromium.org> To: Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Hans Verkuil , Ricardo Ribalda X-Mailer: b4 0.13.0 Split out the wait function, and introduce some new toys: guard and lockdep. This fixes the following cocci warnings: drivers/media/dvb-core/dvb_frontend.c:2897:1-7: preceding lock on line 2776 drivers/media/dvb-core/dvb_frontend.c:2897:1-7: preceding lock on line 2786 drivers/media/dvb-core/dvb_frontend.c:2897:1-7: preceding lock on line 2809 Signed-off-by: Ricardo Ribalda --- drivers/media/dvb-core/dvb_frontend.c | 59 ++++++++++++++++++++++---------= ---- 1 file changed, 38 insertions(+), 21 deletions(-) diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core= /dvb_frontend.c index e81b9996530e..a7739f5e78cb 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -30,6 +30,7 @@ #include #include #include +#include #include =20 #include @@ -2826,6 +2827,34 @@ static int __dvb_frontend_open(struct inode *inode, = struct file *file) return ret; } =20 +static int wait_dvb_frontend(struct dvb_adapter *adapter, + struct dvb_device *mfedev) +{ + struct dvb_frontend *mfe =3D mfedev->priv; + struct dvb_frontend_private *mfepriv =3D mfe->frontend_priv; + int mferetry =3D (dvb_mfe_wait_time << 1); + int ret =3D 0; + + lockdep_assert_held(&adapter->mfe_lock); + + if (mfedev->users =3D=3D -1 && !mfepriv->thread) + return 0; + + mutex_unlock(&adapter->mfe_lock); + + while (mferetry-- && (mfedev->users !=3D -1 || mfepriv->thread)) { + if (msleep_interruptible(500)) + if (signal_pending(current)) { + ret =3D -EINTR; + break; + } + } + + mutex_lock(&adapter->mfe_lock); + + return ret; +} + static int dvb_frontend_open(struct inode *inode, struct file *file) { struct dvb_device *dvbdev =3D file->private_data; @@ -2840,19 +2869,17 @@ static int dvb_frontend_open(struct inode *inode, s= truct file *file) if (!adapter->mfe_shared) return __dvb_frontend_open(inode, file); =20 + + guard(mutex)(&adapter->mfe_lock); + if (adapter->mfe_shared =3D=3D 2) { - mutex_lock(&adapter->mfe_lock); if ((file->f_flags & O_ACCMODE) !=3D O_RDONLY) { if (adapter->mfe_dvbdev && - !adapter->mfe_dvbdev->writers) { - mutex_unlock(&adapter->mfe_lock); + !adapter->mfe_dvbdev->writers) return -EBUSY; - } adapter->mfe_dvbdev =3D dvbdev; } } else { - mutex_lock(&adapter->mfe_lock); - if (!adapter->mfe_dvbdev) { adapter->mfe_dvbdev =3D dvbdev; } else if (adapter->mfe_dvbdev !=3D dvbdev) { @@ -2862,34 +2889,24 @@ static int dvb_frontend_open(struct inode *inode, s= truct file *file) *mfe =3D mfedev->priv; struct dvb_frontend_private *mfepriv =3D mfe->frontend_priv; - int mferetry =3D (dvb_mfe_wait_time << 1); - - mutex_unlock(&adapter->mfe_lock); - while (mferetry-- && (mfedev->users !=3D -1 || - mfepriv->thread)) { - if (msleep_interruptible(500)) { - if (signal_pending(current)) - return -EINTR; - } - } =20 - mutex_lock(&adapter->mfe_lock); + ret =3D wait_dvb_frontend(adapter, mfedev); + if (ret) + return ret; + if (adapter->mfe_dvbdev !=3D dvbdev) { mfedev =3D adapter->mfe_dvbdev; mfe =3D mfedev->priv; mfepriv =3D mfe->frontend_priv; if (mfedev->users !=3D -1 || - mfepriv->thread) { - mutex_unlock(&adapter->mfe_lock); + mfepriv->thread) return -EBUSY; - } adapter->mfe_dvbdev =3D dvbdev; } } } =20 ret =3D __dvb_frontend_open(inode, file); - mutex_unlock(&adapter->mfe_lock); =20 return ret; } --=20 2.45.2.505.gda0bf45e8d-goog