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[media] dvb_usb_v2: locked versions of USB bulk IO functions

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Implement:
dvb_usbv2_generic_rw_locked()
dvb_usbv2_generic_write_locked()
Caller must hold device lock when locked versions are called.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2013-02-26 13:01:48 -03:00 committed by Mauro Carvalho Chehab
parent 972b072a83
commit acb0549acc
2 changed files with 37 additions and 5 deletions
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4
drivers/media/usb/dvb-usb-v2/dvb_usb.h
View File

@ -400,5 +400,9 @@ extern int dvb_usbv2_reset_resume(struct usb_interface *);
/* the generic read/write method for device control */
extern int dvb_usbv2_generic_rw(struct dvb_usb_device *, u8 *, u16, u8 *, u16);
extern int dvb_usbv2_generic_write(struct dvb_usb_device *, u8 *, u16);
/* caller must hold lock when locked versions are called */
extern int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *,
u8 *, u16, u8 *, u16);
extern int dvb_usbv2_generic_write_locked(struct dvb_usb_device *, u8 *, u16);
#endif

38
drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c
View File

@ -21,8 +21,8 @@
#include "dvb_usb_common.h"
int dvb_usbv2_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
u16 rlen)
int dvb_usb_v2_generic_io(struct dvb_usb_device *d,
u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
int ret, actual_length;
@ -32,8 +32,6 @@ int dvb_usbv2_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
return -EINVAL;
}
mutex_lock(&d->usb_mutex);
dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf);
ret = usb_bulk_msg(d->udev, usb_sndbulkpipe(d->udev,
@ -63,13 +61,43 @@ int dvb_usbv2_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
actual_length, rbuf);
}
return ret;
}
int dvb_usbv2_generic_rw(struct dvb_usb_device *d,
u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
int ret;
mutex_lock(&d->usb_mutex);
ret = dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
mutex_unlock(&d->usb_mutex);
return ret;
}
EXPORT_SYMBOL(dvb_usbv2_generic_rw);
int dvb_usbv2_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
{
return dvb_usbv2_generic_rw(d, buf, len, NULL, 0);
int ret;
mutex_lock(&d->usb_mutex);
ret = dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
mutex_unlock(&d->usb_mutex);
return ret;
}
EXPORT_SYMBOL(dvb_usbv2_generic_write);
int dvb_usbv2_generic_rw_locked(struct dvb_usb_device *d,
u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
return dvb_usb_v2_generic_io(d, wbuf, wlen, rbuf, rlen);
}
EXPORT_SYMBOL(dvb_usbv2_generic_rw_locked);
int dvb_usbv2_generic_write_locked(struct dvb_usb_device *d, u8 *buf, u16 len)
{
return dvb_usb_v2_generic_io(d, buf, len, NULL, 0);
}
EXPORT_SYMBOL(dvb_usbv2_generic_write_locked);