linux-kernel - [PATCH v2 06/10] media: rtl2830: switch to i2c_lock_bus(..., I2C_LOCK

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Date:   Wed, 20 Jun 2018 07:17:59 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Rosin <peda@...ntia.se>, Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Haavard Skinnemoen <hskinnemoen@...il.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...aro.org>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Guenter Roeck <linux@...ck-us.net>, Crt Mori <cmo@...exis.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Antti Palosaari <crope@....fi>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Krufky <mkrufky@...uxtv.org>,
        Lee Jones <lee.jones@...aro.org>,
        linux-integrity@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-input@...r.kernel.org, linux-media@...r.kernel.org
Subject: [PATCH v2 06/10] media: rtl2830: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT)

Locking the root adapter for __i2c_transfer will deadlock if the
device sits behind a mux-locked I2C mux. Switch to the finer-grained
i2c_lock_bus with the I2C_LOCK_SEGMENT flag. If the device does not
sit behind a mux-locked mux, the two locking variants are equivalent.

Signed-off-by: Peter Rosin <peda@...ntia.se>
---
 drivers/media/dvb-frontends/rtl2830.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/media/dvb-frontends/rtl2830.c b/drivers/media/dvb-frontends/rtl2830.c
index 7bbfe11d11ed..91d12e6a03d5 100644
--- a/drivers/media/dvb-frontends/rtl2830.c
+++ b/drivers/media/dvb-frontends/rtl2830.c
@@ -24,9 +24,9 @@ static int rtl2830_bulk_write(struct i2c_client *client, unsigned int reg,
 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
 	int ret;
 
-	i2c_lock_adapter(client->adapter);
+	i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
 	ret = regmap_bulk_write(dev->regmap, reg, val, val_count);
-	i2c_unlock_adapter(client->adapter);
+	i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
 	return ret;
 }
 
@@ -36,9 +36,9 @@ static int rtl2830_update_bits(struct i2c_client *client, unsigned int reg,
 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
 	int ret;
 
-	i2c_lock_adapter(client->adapter);
+	i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
 	ret = regmap_update_bits(dev->regmap, reg, mask, val);
-	i2c_unlock_adapter(client->adapter);
+	i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
 	return ret;
 }
 
@@ -48,9 +48,9 @@ static int rtl2830_bulk_read(struct i2c_client *client, unsigned int reg,
 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
 	int ret;
 
-	i2c_lock_adapter(client->adapter);
+	i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
 	ret = regmap_bulk_read(dev->regmap, reg, val, val_count);
-	i2c_unlock_adapter(client->adapter);
+	i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
 	return ret;
 }
 
-- 
2.11.0