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[media] vp702x: fix locking of usb operations

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Otherwise it is not obvious that vp702x_usb_in_op or vp702x_usb_out_op
will not interfere with any vp702x_usb_inout_op.

Note: This change is tested to compile only, as I don't have the
hardware.

Signed-off-by: Florian Mickler <florian@mickler.org>
Cc: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Florian Mickler 2011-03-21 07:19:11 -03:00 committed by Mauro Carvalho Chehab
parent 57873c720c
commit 9a187c4183
1 changed files with 30 additions and 7 deletions
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37
drivers/media/dvb/dvb-usb/vp702x.c
View File

@ -30,8 +30,8 @@ struct vp702x_adapter_state {
u8 pid_filter_state;
};
/* check for mutex FIXME */
int vp702x_usb_in_op(struct dvb_usb_device *d, u8 req, u16 value, u16 index, u8 *b, int blen)
static int vp702x_usb_in_op_unlocked(struct dvb_usb_device *d, u8 req,
u16 value, u16 index, u8 *b, int blen)
{
int ret;
@ -55,8 +55,20 @@ int vp702x_usb_in_op(struct dvb_usb_device *d, u8 req, u16 value, u16 index, u8
return ret;
}
static int vp702x_usb_out_op(struct dvb_usb_device *d, u8 req, u16 value,
u16 index, u8 *b, int blen)
int vp702x_usb_in_op(struct dvb_usb_device *d, u8 req, u16 value,
u16 index, u8 *b, int blen)
{
int ret;
mutex_lock(&d->usb_mutex);
ret = vp702x_usb_in_op_unlocked(d, req, value, index, b, blen);
mutex_unlock(&d->usb_mutex);
return ret;
}
int vp702x_usb_out_op_unlocked(struct dvb_usb_device *d, u8 req, u16 value,
u16 index, u8 *b, int blen)
{
int ret;
deb_xfer("out: req. %02x, val: %04x, ind: %04x, buffer: ",req,value,index);
@ -74,6 +86,18 @@ static int vp702x_usb_out_op(struct dvb_usb_device *d, u8 req, u16 value,
return 0;
}
int vp702x_usb_out_op(struct dvb_usb_device *d, u8 req, u16 value,
u16 index, u8 *b, int blen)
{
int ret;
mutex_lock(&d->usb_mutex);
ret = vp702x_usb_out_op_unlocked(d, req, value, index, b, blen);
mutex_unlock(&d->usb_mutex);
return ret;
}
int vp702x_usb_inout_op(struct dvb_usb_device *d, u8 *o, int olen, u8 *i, int ilen, int msec)
{
int ret;
@ -81,12 +105,11 @@ int vp702x_usb_inout_op(struct dvb_usb_device *d, u8 *o, int olen, u8 *i, int il
if ((ret = mutex_lock_interruptible(&d->usb_mutex)))
return ret;
ret = vp702x_usb_out_op(d,REQUEST_OUT,0,0,o,olen);
ret = vp702x_usb_out_op_unlocked(d, REQUEST_OUT, 0, 0, o, olen);
msleep(msec);
ret = vp702x_usb_in_op(d,REQUEST_IN,0,0,i,ilen);
ret = vp702x_usb_in_op_unlocked(d, REQUEST_IN, 0, 0, i, ilen);
mutex_unlock(&d->usb_mutex);
return ret;
}