[src/trunk]: src/sys/dev/i2c Handle failing to acquire the iic bus.

[jdc <jdc%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b22441a2ec15
branches:  trunk
changeset: 1017016:b22441a2ec15
user:      jdc <jdc%NetBSD.org@localhost>
date:      Thu Dec 10 17:02:51 2020 +0000

description:
Handle failing to acquire the iic bus.
Better handle errors when attaching sysmon sensors.

diffstat:

 sys/dev/i2c/adm1021.c |  30 +++++++++++++++++++++---------
 1 files changed, 21 insertions(+), 9 deletions(-)

diffs (114 lines):

diff -r b3e99904dce1 -r b22441a2ec15 sys/dev/i2c/adm1021.c
--- a/sys/dev/i2c/adm1021.c     Thu Dec 10 16:47:42 2020 +0000
+++ b/sys/dev/i2c/adm1021.c     Thu Dec 10 17:02:51 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: adm1021.c,v 1.20 2020/08/21 20:44:38 macallan Exp $ */
+/*     $NetBSD: adm1021.c,v 1.21 2020/12/10 17:02:51 jdc Exp $ */
 /*     $OpenBSD: adm1021.c,v 1.27 2007/06/24 05:34:35 dlg Exp $        */
 
 /*
@@ -38,7 +38,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: adm1021.c,v 1.20 2020/08/21 20:44:38 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: adm1021.c,v 1.21 2020/12/10 17:02:51 jdc Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -396,6 +396,7 @@
        if (sysmon_envsys_sensor_attach(
            sc->sc_sme, &sc->sc_sensor[ADMTEMP_INT])) {
                sysmon_envsys_destroy(sc->sc_sme);
+               sc->sc_sme = NULL;
                aprint_error_dev(self,
                    "unable to attach internal at sysmon\n");
                return;
@@ -404,6 +405,7 @@
            sysmon_envsys_sensor_attach(
            sc->sc_sme, &sc->sc_sensor[ADMTEMP_EXT])) {
                sysmon_envsys_destroy(sc->sc_sme);
+               sc->sc_sme = NULL;
                aprint_error_dev(self,
                    "unable to attach external at sysmon\n");
                return;
@@ -425,6 +427,7 @@
                aprint_error_dev(self,
                    "unable to register with sysmon\n");
                sysmon_envsys_destroy(sc->sc_sme);
+               sc->sc_sme = NULL;
                return;
        }
 }
@@ -437,7 +440,10 @@
        uint8_t cmd, xdata;
        int8_t sdata;
 
-       iic_acquire_bus(sc->sc_tag, 0);
+       if (iic_acquire_bus(sc->sc_tag, 0)) {
+               edata->state = ENVSYS_SINVALID;
+               return;
+       }
 
        if (edata->sensor == ADMTEMP_INT)
                cmd = ADM1021_INT_TEMP;
@@ -472,7 +478,8 @@
 
        *props &= ~(PROP_CRITMAX | PROP_CRITMIN);
 
-       iic_acquire_bus(sc->sc_tag, 0);
+       if (iic_acquire_bus(sc->sc_tag, 0))
+               return;
 
        if (edata->sensor == ADMTEMP_INT)
                cmd = ADM1021_INT_HIGH_READ;
@@ -521,7 +528,8 @@
 
        *props &= ~(PROP_CRITMAX | PROP_CRITMIN);
 
-       iic_acquire_bus(sc->sc_tag, 0);
+       if (iic_acquire_bus(sc->sc_tag, 0))
+               return;
 
        if (edata->sensor == ADMTEMP_INT)
                cmd = ADM1021_INT_HIGH_READ;
@@ -585,7 +593,8 @@
 
        *props &= ~(PROP_WARNMAX | PROP_CRITMAX | PROP_WARNMIN);
 
-       iic_acquire_bus(sc->sc_tag, 0);
+       if (iic_acquire_bus(sc->sc_tag, 0))
+               return;
 
        if (edata->sensor == ADMTEMP_INT)
                cmd = ADM1032_INT_THERM;
@@ -660,7 +669,8 @@
        int tmp;
        int8_t sdata;
 
-       iic_acquire_bus(sc->sc_tag, 0);
+       if (iic_acquire_bus(sc->sc_tag, 0))
+               return;
 
        if (*props & PROP_CRITMAX) {
                if (edata->sensor == ADMTEMP_INT)
@@ -746,7 +756,8 @@
        else
                ext11 = 1;
 
-       iic_acquire_bus(sc->sc_tag, 0);
+       if (iic_acquire_bus(sc->sc_tag, 0))
+               return;
 
        if (*props & PROP_CRITMAX) {
                if (edata->sensor == ADMTEMP_INT)
@@ -803,7 +814,8 @@
        else
                ext11 = 1;
 
-       iic_acquire_bus(sc->sc_tag, 0);
+       if (iic_acquire_bus(sc->sc_tag, 0))
+               return;
 
        if (*props & PROP_CRITMAX) {
                if (edata->sensor == ADMTEMP_INT)