linux-kernel - [PATCH stable 4.9 12/21] media: dvb_frontend: get rid of property cache's state

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200605162518.28099-13-florian.fainelli@broadcom.com>
Date:   Fri,  5 Jun 2020 09:25:09 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Krufky <mkrufky@...uxtv.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>,
        Jaedon Shin <jaedon.shin@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        Katsuhiro Suzuki <suzuki.katsuhiro@...ionext.com>,
        Satendra Singh Thakur <satendra.t@...sung.com>,
        linux-media@...r.kernel.org (open list:MEDIA INPUT INFRASTRUCTURE
        (V4L/DVB)),
        linux-fsdevel@...r.kernel.org (open list:FILESYSTEMS (VFS and
        infrastructure))
Subject: [PATCH stable 4.9 12/21] media: dvb_frontend: get rid of property cache's state

From: Mauro Carvalho Chehab <mchehab@...pensource.com>

commit ef2cc27cf860b79874e9fde1419dd67c3372e41c upstream

In the past, I guess the idea was to use state in order to
allow an autofush logic. However, in the current code, it is
used only for debug messages, on a poor man's solution, as
there's already a debug message to indicate when the properties
got flushed.

So, just get rid of it for good.

Reviewed-by: Shuah Khan <shuahkg@....samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/media/dvb-core/dvb_frontend.c | 20 ++++++--------------
 drivers/media/dvb-core/dvb_frontend.h |  5 -----
 2 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 5b06ac91420f..a7ba8e200b67 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -932,8 +932,6 @@ static int dvb_frontend_clear_cache(struct dvb_frontend *fe)
 	memset(c, 0, offsetof(struct dtv_frontend_properties, strength));
 	c->delivery_system = delsys;
 
-	c->state = DTV_CLEAR;
-
 	dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n",
 			__func__, c->delivery_system);
 
@@ -1760,13 +1758,13 @@ static int dtv_property_process_set(struct dvb_frontend *fe,
 		dvb_frontend_clear_cache(fe);
 		break;
 	case DTV_TUNE:
-		/* interpret the cache of data, build either a traditional frontend
-		 * tunerequest so we can pass validation in the FE_SET_FRONTEND
-		 * ioctl.
+		/*
+		 * Use the cached Digital TV properties to tune the
+		 * frontend
 		 */
-		c->state = tvp->cmd;
-		dev_dbg(fe->dvb->device, "%s: Finalised property cache\n",
-				__func__);
+		dev_dbg(fe->dvb->device,
+			"%s: Setting the frontend from property cache\n",
+			__func__);
 
 		r = dtv_set_frontend(fe);
 		break;
@@ -1915,7 +1913,6 @@ static int dvb_frontend_ioctl(struct file *file, unsigned int cmd, void *parg)
 {
 	struct dvb_device *dvbdev = file->private_data;
 	struct dvb_frontend *fe = dvbdev->priv;
-	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
 	int err;
 
@@ -1935,7 +1932,6 @@ static int dvb_frontend_ioctl(struct file *file, unsigned int cmd, void *parg)
 		return -EPERM;
 	}
 
-	c->state = DTV_UNDEFINED;
 	err = dvb_frontend_handle_ioctl(file, cmd, parg);
 
 	up(&fepriv->sem);
@@ -2119,10 +2115,6 @@ static int dvb_frontend_handle_ioctl(struct file *file,
 			}
 			(tvp + i)->result = err;
 		}
-
-		if (c->state == DTV_TUNE)
-			dev_dbg(fe->dvb->device, "%s: Property cache is full, tuning\n", __func__);
-
 		kfree(tvp);
 		break;
 	}
diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h
index f852f0a49f42..8a6267ad56d6 100644
--- a/drivers/media/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb-core/dvb_frontend.h
@@ -615,11 +615,6 @@ struct dtv_frontend_properties {
 	struct dtv_fe_stats	post_bit_count;
 	struct dtv_fe_stats	block_error;
 	struct dtv_fe_stats	block_count;
-
-	/* private: */
-	/* Cache State */
-	u32			state;
-
 };
 
 #define DVB_FE_NO_EXIT  0
-- 
2.17.1