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authorDan Carpenter <dan.carpenter@oracle.com>2017-04-28 09:52:07 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-06-24 15:38:37 -0300
commitd18a6ef59c53022b4af222412dc494cfd21c298e (patch)
treeb13bb89281ffddb5233b022fb8a798b58576f4be /drivers/media
parentdbe885a5dd86abc4bbcc72d17a6be4e92308c87f (diff)
media: dib0700: fix locking in dib0700_i2c_xfer_new()
This patch mostly adds unlocks to error paths. But one additional small change is that I made the first "break;" a "goto unlock;" which means that now we return failure instead of success on that path. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/usb/dvb-usb/dib0700_core.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/media/usb/dvb-usb/dib0700_core.c b/drivers/media/usb/dvb-usb/dib0700_core.c
index 08acdd32e412..4dea79718827 100644
--- a/drivers/media/usb/dvb-usb/dib0700_core.c
+++ b/drivers/media/usb/dvb-usb/dib0700_core.c
@@ -215,13 +215,14 @@ static int dib0700_i2c_xfer_new(struct i2c_adapter *adap, struct i2c_msg *msg,
USB_CTRL_GET_TIMEOUT);
if (result < 0) {
deb_info("i2c read error (status = %d)\n", result);
- break;
+ goto unlock;
}
if (msg[i].len > sizeof(st->buf)) {
deb_info("buffer too small to fit %d bytes\n",
msg[i].len);
- return -EIO;
+ result = -EIO;
+ goto unlock;
}
memcpy(msg[i].buf, st->buf, msg[i].len);
@@ -233,8 +234,8 @@ static int dib0700_i2c_xfer_new(struct i2c_adapter *adap, struct i2c_msg *msg,
/* Write request */
if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
err("could not acquire lock");
- mutex_unlock(&d->i2c_mutex);
- return -EINTR;
+ result = -EINTR;
+ goto unlock;
}
st->buf[0] = REQUEST_NEW_I2C_WRITE;
st->buf[1] = msg[i].addr << 1;
@@ -247,7 +248,9 @@ static int dib0700_i2c_xfer_new(struct i2c_adapter *adap, struct i2c_msg *msg,
if (msg[i].len > sizeof(st->buf) - 4) {
deb_info("i2c message to big: %d\n",
msg[i].len);
- return -EIO;
+ mutex_unlock(&d->usb_mutex);
+ result = -EIO;
+ goto unlock;
}
/* The Actual i2c payload */
@@ -269,8 +272,11 @@ static int dib0700_i2c_xfer_new(struct i2c_adapter *adap, struct i2c_msg *msg,
}
}
}
+ result = i;
+
+unlock:
mutex_unlock(&d->i2c_mutex);
- return i;
+ return result;
}
/*