As reported by Klaus: From: Klaus Schmidinger <Klaus.Schmidinger@xxxxxxx> Subject: DVB: EOPNOTSUPP vs. ENOTTY in ioctl(FE_READ_UNCORRECTED_BLOCKS) Date: Thu, 14 Feb 2013 14:12:31 +0100 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 177ffe506cf8ab5d1d52e7af36871a70d8c22e90: Author: Antti Palosaari <crope@xxxxxx> Date: Wed Aug 15 20:28:38 2012 -0300 [media] dvb_frontend: return -ENOTTY for unimplement IOCTL Earlier it was returning -EOPNOTSUPP. Signed-off-by: Antti Palosaari <crope@xxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> Reported-by: Klaus Schmidinger <Klaus.Schmidinger@xxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> --- drivers/media/dvb-core/dvb_frontend.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index 49d9504..0223ad2 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: { -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
