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[media] dvb_frontend: fix ioctls failing if frontend open/closed too fast

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That likely fixes this MythTV ticket:
	http://code.mythtv.org/trac/ticket/10830
(which btw affects all usb tuners I tested as well, pctv452e,
dib0700, af9015)  pctv452e is still possibly broken with MythTV
even after this fix; it does work with VDR here tho despite I2C
errors.
Reduced testcase:
	http://people.freebsd.org/~nox/tmp/ioctltst.c
Thanx to devinheitmueller and crope from #linuxtv for helping with
this fix! :)

Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Juergen Lock 2012-12-23 17:23:06 -03:00 committed by Mauro Carvalho Chehab
parent a75831f360
commit 6ae2322455
1 changed files with 14 additions and 5 deletions
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19
drivers/media/dvb-core/dvb_frontend.c
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@ -603,6 +603,7 @@ static int dvb_frontend_thread(void *data)
enum dvbfe_algo algo;
bool re_tune = false;
bool semheld = false;
dev_dbg(fe->dvb->device, "%s:\n", __func__);
@ -626,6 +627,8 @@ restart:
if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
/* got signal or quitting */
if (!down_interruptible(&fepriv->sem))
semheld = true;
fepriv->exit = DVB_FE_NORMAL_EXIT;
break;
}
@ -741,6 +744,8 @@ restart:
fepriv->exit = DVB_FE_NO_EXIT;
mb();
if (semheld)
up(&fepriv->sem);
dvb_frontend_wakeup(fe);
return 0;
}
@ -1823,16 +1828,20 @@ static int dvb_frontend_ioctl(struct file *file,
int err = -ENOTTY;
dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd));
if (fepriv->exit != DVB_FE_NO_EXIT)
if (down_interruptible(&fepriv->sem))
return -ERESTARTSYS;
if (fepriv->exit != DVB_FE_NO_EXIT) {
up(&fepriv->sem);
return -ENODEV;
}
if ((file->f_flags & O_ACCMODE) == O_RDONLY &&
(_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT ||
cmd == FE_DISEQC_RECV_SLAVE_REPLY))
cmd == FE_DISEQC_RECV_SLAVE_REPLY)) {
up(&fepriv->sem);
return -EPERM;
if (down_interruptible (&fepriv->sem))
return -ERESTARTSYS;
}
if ((cmd == FE_SET_PROPERTY) || (cmd == FE_GET_PROPERTY))
err = dvb_frontend_ioctl_properties(file, cmd, parg);