mirror of https://gitee.com/openkylin/linux.git
[media] dib0700: protect the dib0700 buffer access
This patch protects the common buffer access inside the dib0700 in order to manage concurrent access. This protection is done using mutex. Cc: Mauro Carvalho Chehab <mchehab@redhat.com> Cc: Florian Mickler <florian@mickler.org> Cc: stable@kernel.org Signed-off-by: Javier Marcet <javier@marcet.info> Signed-off-by: Olivier Grenie <olivier.grenie@dibcom.fr> Signed-off-by: Patrick Boettcher <patrick.boettcher@dibcom.fr> [mchehab@redhat.com: dprint requires 3 arguments. Replaced by dib_info] Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Olivier Grenie
Mauro Carvalho Chehab
parent
79fcce3230
commit
bff469f416
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@ -30,6 +30,11 @@ int dib0700_get_version(struct dvb_usb_device *d, u32 *hwversion,
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struct dib0700_state *st = d->priv;
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int ret;
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if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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ret = usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev, 0),
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REQUEST_GET_VERSION,
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USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
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@ -46,6 +51,7 @@ int dib0700_get_version(struct dvb_usb_device *d, u32 *hwversion,
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if (fwtype != NULL)
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*fwtype = (st->buf[12] << 24) | (st->buf[13] << 16) |
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(st->buf[14] << 8) | st->buf[15];
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mutex_unlock(&d->usb_mutex);
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return ret;
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}
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@ -108,7 +114,12 @@ int dib0700_ctrl_rd(struct dvb_usb_device *d, u8 *tx, u8 txlen, u8 *rx, u8 rxlen
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int dib0700_set_gpio(struct dvb_usb_device *d, enum dib07x0_gpios gpio, u8 gpio_dir, u8 gpio_val)
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{
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struct dib0700_state *st = d->priv;
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s16 ret;
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int ret;
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if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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st->buf[0] = REQUEST_SET_GPIO;
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st->buf[1] = gpio;
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@ -116,6 +127,7 @@ int dib0700_set_gpio(struct dvb_usb_device *d, enum dib07x0_gpios gpio, u8 gpio_
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ret = dib0700_ctrl_wr(d, st->buf, 3);
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mutex_unlock(&d->usb_mutex);
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return ret;
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}
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@ -125,6 +137,11 @@ static int dib0700_set_usb_xfer_len(struct dvb_usb_device *d, u16 nb_ts_packets)
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int ret;
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if (st->fw_version >= 0x10201) {
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if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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st->buf[0] = REQUEST_SET_USB_XFER_LEN;
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st->buf[1] = (nb_ts_packets >> 8) & 0xff;
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st->buf[2] = nb_ts_packets & 0xff;
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@ -132,6 +149,7 @@ static int dib0700_set_usb_xfer_len(struct dvb_usb_device *d, u16 nb_ts_packets)
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deb_info("set the USB xfer len to %i Ts packet\n", nb_ts_packets);
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ret = dib0700_ctrl_wr(d, st->buf, 3);
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mutex_unlock(&d->usb_mutex);
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} else {
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deb_info("this firmware does not allow to change the USB xfer len\n");
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ret = -EIO;
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@ -208,6 +226,10 @@ static int dib0700_i2c_xfer_new(struct i2c_adapter *adap, struct i2c_msg *msg,
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} else {
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/* Write request */
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if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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st->buf[0] = REQUEST_NEW_I2C_WRITE;
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st->buf[1] = msg[i].addr << 1;
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st->buf[2] = (en_start << 7) | (en_stop << 6) |
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@ -227,6 +249,7 @@ static int dib0700_i2c_xfer_new(struct i2c_adapter *adap, struct i2c_msg *msg,
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USB_TYPE_VENDOR | USB_DIR_OUT,
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0, 0, st->buf, msg[i].len + 4,
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USB_CTRL_GET_TIMEOUT);
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mutex_unlock(&d->usb_mutex);
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if (result < 0) {
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deb_info("i2c write error (status = %d)\n", result);
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break;
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@ -249,6 +272,10 @@ static int dib0700_i2c_xfer_legacy(struct i2c_adapter *adap,
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if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
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return -EAGAIN;
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if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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for (i = 0; i < num; i++) {
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/* fill in the address */
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@ -279,6 +306,7 @@ static int dib0700_i2c_xfer_legacy(struct i2c_adapter *adap,
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break;
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}
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}
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mutex_unlock(&d->usb_mutex);
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mutex_unlock(&d->i2c_mutex);
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return i;
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@ -337,7 +365,12 @@ static int dib0700_set_clock(struct dvb_usb_device *d, u8 en_pll,
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u16 pll_loopdiv, u16 free_div, u16 dsuScaler)
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{
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struct dib0700_state *st = d->priv;
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s16 ret;
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int ret;
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if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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st->buf[0] = REQUEST_SET_CLOCK;
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st->buf[1] = (en_pll << 7) | (pll_src << 6) |
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@ -352,6 +385,7 @@ static int dib0700_set_clock(struct dvb_usb_device *d, u8 en_pll,
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st->buf[9] = dsuScaler & 0xff; /* LSB */
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ret = dib0700_ctrl_wr(d, st->buf, 10);
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mutex_unlock(&d->usb_mutex);
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return ret;
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}
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@ -360,10 +394,16 @@ int dib0700_set_i2c_speed(struct dvb_usb_device *d, u16 scl_kHz)
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{
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struct dib0700_state *st = d->priv;
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u16 divider;
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int ret;
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if (scl_kHz == 0)
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return -EINVAL;
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if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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st->buf[0] = REQUEST_SET_I2C_PARAM;
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divider = (u16) (30000 / scl_kHz);
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st->buf[1] = 0;
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@ -379,7 +419,11 @@ int dib0700_set_i2c_speed(struct dvb_usb_device *d, u16 scl_kHz)
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deb_info("setting I2C speed: %04x %04x %04x (%d kHz).",
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(st->buf[2] << 8) | (st->buf[3]), (st->buf[4] << 8) |
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st->buf[5], (st->buf[6] << 8) | st->buf[7], scl_kHz);
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return dib0700_ctrl_wr(d, st->buf, 8);
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ret = dib0700_ctrl_wr(d, st->buf, 8);
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mutex_unlock(&d->usb_mutex);
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return ret;
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}
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@ -515,6 +559,11 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
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}
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}
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if (mutex_lock_interruptible(&adap->dev->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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st->buf[0] = REQUEST_ENABLE_VIDEO;
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/* this bit gives a kind of command,
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* rather than enabling something or not */
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@ -548,7 +597,10 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
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deb_info("data for streaming: %x %x\n", st->buf[1], st->buf[2]);
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return dib0700_ctrl_wr(adap->dev, st->buf, 4);
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ret = dib0700_ctrl_wr(adap->dev, st->buf, 4);
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mutex_unlock(&adap->dev->usb_mutex);
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return ret;
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}
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int dib0700_change_protocol(struct rc_dev *rc, u64 rc_type)
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@ -557,6 +609,11 @@ int dib0700_change_protocol(struct rc_dev *rc, u64 rc_type)
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struct dib0700_state *st = d->priv;
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int new_proto, ret;
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if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
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deb_info("could not acquire lock");
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return 0;
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}
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st->buf[0] = REQUEST_SET_RC;
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st->buf[1] = 0;
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st->buf[2] = 0;
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@ -567,23 +624,29 @@ int dib0700_change_protocol(struct rc_dev *rc, u64 rc_type)
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else if (rc_type == RC_TYPE_NEC)
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new_proto = 0;
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else if (rc_type == RC_TYPE_RC6) {
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if (st->fw_version < 0x10200)
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return -EINVAL;
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if (st->fw_version < 0x10200) {
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ret = -EINVAL;
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goto out;
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}
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new_proto = 2;
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} else
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return -EINVAL;
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} else {
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ret = -EINVAL;
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goto out;
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}
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st->buf[1] = new_proto;
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ret = dib0700_ctrl_wr(d, st->buf, 3);
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if (ret < 0) {
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err("ir protocol setup failed");
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return ret;
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goto out;
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}
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d->props.rc.core.protocol = rc_type;
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out:
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mutex_unlock(&d->usb_mutex);
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return ret;
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}
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