s390/dasd: Store path configuration data during path handling

Currently, the configuration data for a path is retrieved during a path
verification and used only temporarily. If a path is newly added to the
I/O setup after a boot, no configuration data will be stored for this
particular path.
However, this data is required for later use and should be present for
a valid I/O path anyway. Store this data during the path verification so
that newly added paths can provide all information necessary.

[sth@linux.ibm.com: fix conf_data memleak]

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 497aa81778b603dd54565f489d5c61257f426399..3ff7b532a5bfe27d963bf09bf6a6f53e049889b6 100644 (file)
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1007,6 +1007,11 @@ static void dasd_eckd_store_conf_data(struct dasd_device *device,
        struct subchannel_id sch_id;
 
        ccw_device_get_schid(device->cdev, &sch_id);
+       /*
+        * path handling and read_conf allocate data
+        * free it before replacing the pointer
+        */
+       kfree(device->path[chp].conf_data);
        device->path[chp].conf_data = conf_data;
        device->path[chp].cssid = sch_id.cssid;
        device->path[chp].ssid = sch_id.ssid;
@@ -1263,9 +1268,10 @@ static void do_path_verification_work(struct work_struct *work)
        struct dasd_uid *uid;
        __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
        __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
+       struct dasd_conf_data *conf_data;
        unsigned long flags;
        char print_uid[60];
-       int rc;
+       int rc, pos;
 
        data = container_of(work, struct path_verification_work_data, worker);
        device = data->device;
@@ -1395,6 +1401,14 @@ static void do_path_verification_work(struct work_struct *work)
                        }
                }
 
+               conf_data = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL);
+               if (conf_data) {
+                       memcpy(conf_data, data->rcd_buffer,
+                              DASD_ECKD_RCD_DATA_SIZE);
+               }
+               pos = pathmask_to_pos(lpm);
+               dasd_eckd_store_conf_data(device, conf_data, pos);
+
                /*
                 * There is a small chance that a path is lost again between
                 * above path verification and the following modification of