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authorJuergen Lock <nox@jelal.kn-bremen.de>2012-12-23 17:23:06 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-12-27 15:43:17 -0200
commit6ae23224557d797439d02f6ce5d10a82ab544b21 (patch)
tree69be4a6240defb3e3138689c2cc7c91a779f7816 /drivers/media/dvb-core
parenta75831f3600c479054fc3f70cd11257ab07886e2 (diff)
downloadlinaro-lsk-6ae23224557d797439d02f6ce5d10a82ab544b21.tar.gz
[media] dvb_frontend: fix ioctls failing if frontend open/closed too fast
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>
Diffstat (limited to 'drivers/media/dvb-core')
-rw-r--r--drivers/media/dvb-core/dvb_frontend.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 49d95040096..9b4a47c104a 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -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);