Hi Hans,
Am 05.08.2014 um 09:00 schrieb Hans Verkuil:
> Fix three compiler warnings:
>
> drivers/media/usb/em28xx/em28xx-input.c: In function
> ‘em28xx_i2c_ir_handle_key’:
> drivers/media/usb/em28xx/em28xx-input.c:318:1: warning: the frame size of
> 1096 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> }
> ^
> CC [M] drivers/media/usb/em28xx/em28xx-dvb.o
> drivers/media/usb/em28xx/em28xx-camera.c: In function
> ‘em28xx_probe_sensor_micron’:
> drivers/media/usb/em28xx/em28xx-camera.c:199:1: warning: the frame size of
> 1096 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> }
> ^
> drivers/media/usb/em28xx/em28xx-camera.c: In function
> ‘em28xx_probe_sensor_omnivision’:
> drivers/media/usb/em28xx/em28xx-camera.c:304:1: warning: the frame size of
> 1088 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> }
> ^
Hmmm... I don't get these weird warnings.
How can I reproduce them ?
> Note: there is no way the code in em28xx_i2c_ir_handle_key() is correct: it's
> using an almost completely uninitialized i2c_client struct with random flags,
> dev and name fields. Can't this turned into a proper i2c_client struct in
> struct em28xx? At least with this patch it's no longer random data.
Why do you think the client setup is random ?
Which fields do you think are wrong ? AFAICS this patch doesn't change
any fields.
What's wrong with using local i2c_client variables ?
Indeed, the way the driver currently tracks i2c clients / subdevices is
... let's say "improvable".
But IMHO, we should go the opposite direction and get rid of the
i2c_clients in the main device struct.
They are in fact just temporary helpers and dangerous to use with
devices with multiple i2c clients on the same bus.
Regards,
Frank
>
> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
>
> diff --git a/drivers/media/usb/em28xx/em28xx-camera.c
> b/drivers/media/usb/em28xx/em28xx-camera.c
> index 6d2ea9a..c8490ba 100644
> --- a/drivers/media/usb/em28xx/em28xx-camera.c
> +++ b/drivers/media/usb/em28xx/em28xx-camera.c
> @@ -110,40 +110,40 @@ static int em28xx_probe_sensor_micron(struct em28xx
> *dev)
> __be16 id_be;
> u16 id;
>
> - struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];
> + dev->tmp_i2c_client = dev->i2c_client[dev->def_i2c_bus];
>
> dev->em28xx_sensor = EM28XX_NOSENSOR;
> for (i = 0; micron_sensor_addrs[i] != I2C_CLIENT_END; i++) {
> - client.addr = micron_sensor_addrs[i];
> + dev->tmp_i2c_client.addr = micron_sensor_addrs[i];
> /* NOTE: i2c_smbus_read_word_data() doesn't work with BE data */
> /* Read chip ID from register 0x00 */
> reg = 0x00;
> - ret = i2c_master_send(&client, ®, 1);
> + ret = i2c_master_send(&dev->tmp_i2c_client, ®, 1);
> if (ret < 0) {
> if (ret != -ENXIO)
> em28xx_errdev("couldn't read from i2c device
> 0x%02x: error %i\n",
> - client.addr << 1, ret);
> + dev->tmp_i2c_client.addr << 1,
> ret);
> continue;
> }
> - ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
> + ret = i2c_master_recv(&dev->tmp_i2c_client, (u8 *)&id_be, 2);
> if (ret < 0) {
> em28xx_errdev("couldn't read from i2c device 0x%02x:
> error %i\n",
> - client.addr << 1, ret);
> + dev->tmp_i2c_client.addr << 1, ret);
> continue;
> }
> id = be16_to_cpu(id_be);
> /* Read chip ID from register 0xff */
> reg = 0xff;
> - ret = i2c_master_send(&client, ®, 1);
> + ret = i2c_master_send(&dev->tmp_i2c_client, ®, 1);
> if (ret < 0) {
> em28xx_errdev("couldn't read from i2c device 0x%02x:
> error %i\n",
> - client.addr << 1, ret);
> + dev->tmp_i2c_client.addr << 1, ret);
> continue;
> }
> - ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
> + ret = i2c_master_recv(&dev->tmp_i2c_client, (u8 *)&id_be, 2);
> if (ret < 0) {
> em28xx_errdev("couldn't read from i2c device 0x%02x:
> error %i\n",
> - client.addr << 1, ret);
> + dev->tmp_i2c_client.addr << 1, ret);
> continue;
> }
> /* Validate chip ID to be sure we have a Micron device */
> @@ -191,7 +191,7 @@ static int em28xx_probe_sensor_micron(struct em28xx *dev)
> else
> em28xx_info("sensor %s detected\n", name);
>
> - dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
> + dev->i2c_client[dev->def_i2c_bus].addr =
> dev->tmp_i2c_client.addr;
> return 0;
> }
>
> @@ -207,28 +207,29 @@ static int em28xx_probe_sensor_omnivision(struct em28xx
> *dev)
> char *name;
> u8 reg;
> u16 id;
> - struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];
> +
> + dev->tmp_i2c_client = dev->i2c_client[dev->def_i2c_bus];
>
> dev->em28xx_sensor = EM28XX_NOSENSOR;
> /* NOTE: these devices have the register auto incrementation disabled
> * by default, so we have to use single byte reads ! */
> for (i = 0; omnivision_sensor_addrs[i] != I2C_CLIENT_END; i++) {
> - client.addr = omnivision_sensor_addrs[i];
> + dev->tmp_i2c_client.addr = omnivision_sensor_addrs[i];
> /* Read manufacturer ID from registers 0x1c-0x1d (BE) */
> reg = 0x1c;
> - ret = i2c_smbus_read_byte_data(&client, reg);
> + ret = i2c_smbus_read_byte_data(&dev->tmp_i2c_client, reg);
> if (ret < 0) {
> if (ret != -ENXIO)
> em28xx_errdev("couldn't read from i2c device
> 0x%02x: error %i\n",
> - client.addr << 1, ret);
> + dev->tmp_i2c_client.addr << 1,
> ret);
> continue;
> }
> id = ret << 8;
> reg = 0x1d;
> - ret = i2c_smbus_read_byte_data(&client, reg);
> + ret = i2c_smbus_read_byte_data(&dev->tmp_i2c_client, reg);
> if (ret < 0) {
> em28xx_errdev("couldn't read from i2c device 0x%02x:
> error %i\n",
> - client.addr << 1, ret);
> + dev->tmp_i2c_client.addr << 1, ret);
> continue;
> }
> id += ret;
> @@ -237,18 +238,18 @@ static int em28xx_probe_sensor_omnivision(struct em28xx
> *dev)
> continue;
> /* Read product ID from registers 0x0a-0x0b (BE) */
> reg = 0x0a;
> - ret = i2c_smbus_read_byte_data(&client, reg);
> + ret = i2c_smbus_read_byte_data(&dev->tmp_i2c_client, reg);
> if (ret < 0) {
> em28xx_errdev("couldn't read from i2c device 0x%02x:
> error %i\n",
> - client.addr << 1, ret);
> + dev->tmp_i2c_client.addr << 1, ret);
> continue;
> }
> id = ret << 8;
> reg = 0x0b;
> - ret = i2c_smbus_read_byte_data(&client, reg);
> + ret = i2c_smbus_read_byte_data(&dev->tmp_i2c_client, reg);
> if (ret < 0) {
> em28xx_errdev("couldn't read from i2c device 0x%02x:
> error %i\n",
> - client.addr << 1, ret);
> + dev->tmp_i2c_client.addr << 1, ret);
> continue;
> }
> id += ret;
> @@ -296,7 +297,7 @@ static int em28xx_probe_sensor_omnivision(struct em28xx
> *dev)
> else
> em28xx_info("sensor %s detected\n", name);
>
> - dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
> + dev->i2c_client[dev->def_i2c_bus].addr =
> dev->tmp_i2c_client.addr;
> return 0;
> }
>
> diff --git a/drivers/media/usb/em28xx/em28xx-input.c
> b/drivers/media/usb/em28xx/em28xx-input.c
> index ed843bd..07069b6 100644
> --- a/drivers/media/usb/em28xx/em28xx-input.c
> +++ b/drivers/media/usb/em28xx/em28xx-input.c
> @@ -298,12 +298,11 @@ static int em28xx_i2c_ir_handle_key(struct em28xx_IR
> *ir)
> static u32 scancode;
> enum rc_type protocol;
> int rc;
> - struct i2c_client client;
>
> - client.adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
> - client.addr = ir->i2c_dev_addr;
> + dev->tmp_i2c_client.adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
> + dev->tmp_i2c_client.addr = ir->i2c_dev_addr;
>
> - rc = ir->get_key_i2c(&client, &protocol, &scancode);
> + rc = ir->get_key_i2c(&dev->tmp_i2c_client, &protocol, &scancode);
> if (rc < 0) {
> dprintk("ir->get_key_i2c() failed: %d\n", rc);
> return rc;
> diff --git a/drivers/media/usb/em28xx/em28xx.h
> b/drivers/media/usb/em28xx/em28xx.h
> index 84ef8ef..437ca08 100644
> --- a/drivers/media/usb/em28xx/em28xx.h
> +++ b/drivers/media/usb/em28xx/em28xx.h
> @@ -630,6 +630,7 @@ struct em28xx {
> struct i2c_adapter i2c_adap[NUM_I2C_BUSES];
> struct i2c_client i2c_client[NUM_I2C_BUSES];
> struct em28xx_i2c_bus i2c_bus[NUM_I2C_BUSES];
> + struct i2c_client tmp_i2c_client;
>
> unsigned char eeprom_addrwidth_16bit:1;
> unsigned def_i2c_bus; /* Default I2C bus */
--
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