From 6ae23224557d797439d02f6ce5d10a82ab544b21 Mon Sep 17 00:00:00 2001 From: Juergen Lock Date: Sun, 23 Dec 2012 17:23:06 -0300 Subject: [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 Signed-off-by: Michael Krufky Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-core/dvb_frontend.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'drivers/media/dvb-core/dvb_frontend.c') diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index 49d95040096a..9b4a47c104a1 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); -- cgit v1.2.3 From b9b1b3a8f7b76035140912bc9e3a325e58fc6d58 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Tue, 23 Oct 2012 15:57:23 -0300 Subject: [media] dvb-core: Replace memcpy with struct assignment This kind of memcpy() is error-prone. Its replacement with a struct assignment is prefered because it's type-safe and much easier to read. Found by coccinelle. Hand patched and reviewed. Tested by compilation only. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // @@ identifier struct_name; struct struct_name to; struct struct_name from; expression E; @@ -memcpy(&(to), &(from), E); +to = from; // Signed-off-by: Peter Senna Tschudin Signed-off-by: Ezequiel Garcia Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-core/dvb_frontend.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/media/dvb-core/dvb_frontend.c') diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index 9b4a47c104a1..dd35fa972067 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -2255,7 +2255,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file, printk("%s switch command: 0x%04lx\n", __func__, swcmd); do_gettimeofday(&nexttime); if (dvb_frontend_debug) - memcpy(&tv[0], &nexttime, sizeof(struct timeval)); + tv[0] = nexttime; /* before sending a command, initialize by sending * a 32ms 18V to the switch */ -- cgit v1.2.3 From 7cd4ece58f9b94372687de820c22cb2eae4a623e Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Mon, 7 Jan 2013 15:41:35 -0300 Subject: [media] dvb: the core logic to handle the DVBv5 QoS properties Add the logic to poll, reset counters and report the QoS stats to the end user. The idea is that the core will periodically poll the frontend for the stats. The frontend may return -EBUSY, if the previous collect didn't finish, or it may fill the cached data. The value returned to the end user is always the cached data. Reviewed-by: Antti Palosaari Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-core/dvb_frontend.c | 35 +++++++++++++++++++++++++++++++++++ drivers/media/dvb-core/dvb_frontend.h | 10 ++++++++++ 2 files changed, 45 insertions(+) (limited to 'drivers/media/dvb-core/dvb_frontend.c') diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index dd35fa972067..0c6f936ffac8 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -1053,6 +1053,16 @@ static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = { _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0), _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0), _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0), + + /* Statistics API */ + _DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0), + _DTV_CMD(DTV_STAT_CNR, 0, 0), + _DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0), + _DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0), + _DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0), + _DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0), + _DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0), + _DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0), }; static void dtv_property_dump(struct dvb_frontend *fe, struct dtv_property *tvp) @@ -1443,6 +1453,31 @@ static int dtv_property_process_get(struct dvb_frontend *fe, tvp->u.data = c->lna; break; + /* Fill quality measures */ + case DTV_STAT_SIGNAL_STRENGTH: + tvp->u.st = c->strength; + break; + case DTV_STAT_CNR: + tvp->u.st = c->cnr; + break; + case DTV_STAT_PRE_ERROR_BIT_COUNT: + tvp->u.st = c->pre_bit_error; + break; + case DTV_STAT_PRE_TOTAL_BIT_COUNT: + tvp->u.st = c->pre_bit_count; + break; + case DTV_STAT_POST_ERROR_BIT_COUNT: + tvp->u.st = c->post_bit_error; + break; + case DTV_STAT_POST_TOTAL_BIT_COUNT: + tvp->u.st = c->post_bit_count; + break; + case DTV_STAT_ERROR_BLOCK_COUNT: + tvp->u.st = c->block_error; + break; + case DTV_STAT_TOTAL_BLOCK_COUNT: + tvp->u.st = c->block_count; + break; default: return -EINVAL; } diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h index 97112cd88a17..b34922a08156 100644 --- a/drivers/media/dvb-core/dvb_frontend.h +++ b/drivers/media/dvb-core/dvb_frontend.h @@ -393,6 +393,16 @@ struct dtv_frontend_properties { u8 atscmh_sccc_code_mode_d; u32 lna; + + /* statistics data */ + struct dtv_fe_stats strength; + struct dtv_fe_stats cnr; + struct dtv_fe_stats pre_bit_error; + struct dtv_fe_stats pre_bit_count; + struct dtv_fe_stats post_bit_error; + struct dtv_fe_stats post_bit_count; + struct dtv_fe_stats block_error; + struct dtv_fe_stats block_count; }; struct dvb_frontend { -- cgit v1.2.3 From 94a93e5f85040114d6a77c085457b3943b6da889 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Wed, 23 Jan 2013 17:06:02 -0300 Subject: [media] dvb_frontend: print a msg if a property doesn't exist If userspace calls a property that doesn't exist, it currently just returns -EINVAL. However, this is more likely a problem at the userspace application, calling it with a non-existing property. So, add a debug message to help tracking it. Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-core/dvb_frontend.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/media/dvb-core/dvb_frontend.c') diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index 0c6f936ffac8..b059abf572d6 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -1479,6 +1479,9 @@ static int dtv_property_process_get(struct dvb_frontend *fe, tvp->u.st = c->block_count; break; default: + dev_dbg(fe->dvb->device, + "%s: FE property %d doesn't exist\n", + __func__, tvp->cmd); return -EINVAL; } -- cgit v1.2.3 From ac89758697195a8155f3861a34f0b41c6e562fcb Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Fri, 15 Feb 2013 13:39:31 -0200 Subject: Revert "[media] dvb_frontend: return -ENOTTY for unimplement IOCTL" As reported by Klaus Schmidinger: "In VDR I use an ioctl() call with FE_READ_UNCORRECTED_BLOCKS on a device (using stb0899). After this call I check 'errno' for EOPNOTSUPP to determine whether this device supports this call. This used to work just fine, until a few months ago I noticed that my devices using stb0899 didn't display their signal quality in VDR's OSD any more. After further investigation I found that ioctl(FE_READ_UNCORRECTED_BLOCKS) no longer returns EOPNOTSUPP, but rather ENOTTY. And since I stop getting the signal quality in case any unknown errno value appears, this broke my signal quality query function." While the changes reflect what is there at: http://comments.gmane.org/gmane.linux.kernel/1235728 it does cause regression on userspace. So, revert it to stop the damage. This reverts commit 177ffe506cf8 ("[media] dvb_frontend: return -ENOTTY for unimplement IOCTL"). Reported-by: Klaus Schmidinger Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Linus Torvalds --- drivers/media/dvb-core/dvb_frontend.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/media/dvb-core/dvb_frontend.c') diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index 49d95040096a..0223ad255cb4 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -1820,7 +1820,7 @@ static int dvb_frontend_ioctl(struct file *file, struct dvb_frontend *fe = dvbdev->priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; struct dvb_frontend_private *fepriv = fe->frontend_priv; - int err = -ENOTTY; + int err = -EOPNOTSUPP; dev_dbg(fe->dvb->device, "%s: (%d)\n", __func__, _IOC_NR(cmd)); if (fepriv->exit != DVB_FE_NO_EXIT) @@ -1938,7 +1938,7 @@ static int dvb_frontend_ioctl_properties(struct file *file, } } else - err = -ENOTTY; + err = -EOPNOTSUPP; out: kfree(tvp); @@ -2071,7 +2071,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file, struct dvb_frontend *fe = dvbdev->priv; struct dvb_frontend_private *fepriv = fe->frontend_priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; - int err = -ENOTTY; + int err = -EOPNOTSUPP; switch (cmd) { case FE_GET_INFO: { -- cgit v1.2.3