Why after power cycle the server the interface was not detected in RHEL 5 ?

Root Cause

• This error is reported in the function here at line 124:

drivers/base/dd.c

 63 /**
 64  *      driver_probe_device - attempt to bind device & driver.
 65  *      @drv:   driver.
 66  *      @dev:   device.
 67  *
 68  *      First, we call the bus's match function, if one present, which
 69  *      should compare the device IDs the driver supports with the
 70  *      device IDs of the device. Note we don't do this ourselves
 71  *      because we don't know the format of the ID structures, nor what
 72  *      is to be considered a match and what is not.
 73  *
 74  *      This function returns 1 if a match is found, an error if one
 75  *      occurs (that is not -ENODEV or -ENXIO), and 0 otherwise.
 76  *
 77  *      This function must be called with @dev->sem held.  When called
 78  *      for a USB interface, @dev->parent->sem must be held as well.
 79  */
 80 int driver_probe_device(struct device_driver * drv, struct device * dev)
 81 {
 82         int ret = 0;
 83 
 84         if (!device_is_registered(dev))
 85                 return -ENODEV;
 86         if (drv->bus->match && !drv->bus->match(dev, drv))
 87                 goto Done;
 88 
 89         pr_debug("%s: Matched Device %s with Driver %s\n",
 90                  drv->bus->name, dev->bus_id, drv->name);
 91 
 92         dev->driver = drv;
 93         if (dev->bus->probe) {
 94                 ret = dev->bus->probe(dev);
 95                 if (ret) {
 96                         dev->driver = NULL;
 97                         devres_release_all(dev);
 98                         goto ProbeFailed;
 99                 }
100         } else if (drv->probe) {
101                 ret = drv->probe(dev);
102                 if (ret) {
103                         dev->driver = NULL;
104                         devres_release_all(dev);
105                         goto ProbeFailed;
106                 }
107         }
108         device_bind_driver(dev);
109         ret = 1;
110         pr_debug("%s: Bound Device %s to Driver %s\n",
111                  drv->bus->name, dev->bus_id, drv->name);
112         goto Done;
113 
114  ProbeFailed:
115         if (ret == -ENODEV || ret == -ENXIO) {
116                 /* Driver matched, but didn't support device
117                  * or device not found.
118                  * Not an error; keep going.
119                  */
120                 ret = 0;
121         } else {
122                 /* driver matched but the probe failed */
123                 printk(KERN_WARNING
124                        "%s: probe of %s failed with error %d\n", <<----
125                        drv->name, dev->bus_id, ret);
126         }
127  Done:
128         return ret;
129 }

• This code is used to load the appropriate module for a discovered device. If this fails It indicates a hardware issue.