| Message ID | 1555524209-26997-1-git-send-email-a.amelkin@yadro.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [v2,1/1] hwmon (occ): Add temp sensor value check | expand |
On 4/17/19 1:03 PM, Alexander Amelkin wrote: > From: Alexander Soldatov <a.soldatov@yadro.com> > > The occ driver supports two formats for the temp sensor value. > > The OCC firmware for P8 supports only the first format, for which > no range checking or error processing is performed in the driver. > Inspecting the OCC sources for P8 reveals that OCC may send > a special value 0xFFFF to indicate that a sensor read timeout > has occurred, see > > https://github.com/open-power/occ/blob/master_p8/src/occ/cmdh/cmdh_fsp_cmds.c#L395 > > That situation wasn't handled in the driver. This patch adds invalid > temp value check for the sensor data format 1 and handles it the same > way as it is done for the format 2, where EREMOTEIO is reported for > this case. Thanks Alexander and Guenter. Reviewed-by: Eddie James <eajames@linux.ibm.com> > > Signed-off-by: Alexander Soldatov <a.soldatov@yadro.com> > Signed-off-by: Alexander Amelkin <a.amelkin@yadro.com> > Reviewed-by: Alexander Amelkin <a.amelkin@yadro.com> > Cc: Edward A. James <eajames@us.ibm.com> > Cc: Joel Stanley <joel@jms.id.au> > --- > drivers/hwmon/occ/common.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c > index 4679acb..825631c 100644 > --- a/drivers/hwmon/occ/common.c > +++ b/drivers/hwmon/occ/common.c > @@ -235,6 +235,12 @@ static ssize_t occ_show_temp_1(struct device *dev, > val = get_unaligned_be16(&temp->sensor_id); > break; > case 1: > + /* > + * If a sensor reading has expired and couldn't be refreshed, > + * OCC returns 0xFFFF for that sensor. > + */ > + if (temp->value == 0xFFFF) > + return -EREMOTEIO; > val = get_unaligned_be16(&temp->value) * 1000; > break; > default:
On Wed, Apr 17, 2019 at 01:35:41PM -0500, Eddie James wrote: > > On 4/17/19 1:03 PM, Alexander Amelkin wrote: > >From: Alexander Soldatov <a.soldatov@yadro.com> > > > >The occ driver supports two formats for the temp sensor value. > > > >The OCC firmware for P8 supports only the first format, for which > >no range checking or error processing is performed in the driver. > >Inspecting the OCC sources for P8 reveals that OCC may send > >a special value 0xFFFF to indicate that a sensor read timeout > >has occurred, see > > > >https://github.com/open-power/occ/blob/master_p8/src/occ/cmdh/cmdh_fsp_cmds.c#L395 > > > >That situation wasn't handled in the driver. This patch adds invalid > >temp value check for the sensor data format 1 and handles it the same > >way as it is done for the format 2, where EREMOTEIO is reported for > >this case. > > > Thanks Alexander and Guenter. > > > Reviewed-by: Eddie James <eajames@linux.ibm.com> > Applied. Thanks, Guenter > > > > >Signed-off-by: Alexander Soldatov <a.soldatov@yadro.com> > >Signed-off-by: Alexander Amelkin <a.amelkin@yadro.com> > >Reviewed-by: Alexander Amelkin <a.amelkin@yadro.com> > >Cc: Edward A. James <eajames@us.ibm.com> > >Cc: Joel Stanley <joel@jms.id.au> > >--- > > drivers/hwmon/occ/common.c | 4 ++++ > > 1 file changed, 4 insertions(+) > > > >diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c > >index 4679acb..825631c 100644 > >--- a/drivers/hwmon/occ/common.c > >+++ b/drivers/hwmon/occ/common.c > >@@ -235,6 +235,12 @@ static ssize_t occ_show_temp_1(struct device *dev, > > val = get_unaligned_be16(&temp->sensor_id); > > break; > > case 1: > >+ /* > >+ * If a sensor reading has expired and couldn't be refreshed, > >+ * OCC returns 0xFFFF for that sensor. > >+ */ > >+ if (temp->value == 0xFFFF) > >+ return -EREMOTEIO; > > val = get_unaligned_be16(&temp->value) * 1000; > > break; > > default: >
diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c index 4679acb..825631c 100644 --- a/drivers/hwmon/occ/common.c +++ b/drivers/hwmon/occ/common.c @@ -235,6 +235,12 @@ static ssize_t occ_show_temp_1(struct device *dev, val = get_unaligned_be16(&temp->sensor_id); break; case 1: + /* + * If a sensor reading has expired and couldn't be refreshed, + * OCC returns 0xFFFF for that sensor. + */ + if (temp->value == 0xFFFF) + return -EREMOTEIO; val = get_unaligned_be16(&temp->value) * 1000; break; default: