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s390/dasd: Store path configuration data during path handling

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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>
This commit is contained in:
Jan Höppner 2020-10-08 15:13:32 +02:00 committed by Jens Axboe
parent d2a527580c
commit 460181217a
1 changed files with 15 additions and 1 deletions
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16
drivers/s390/block/dasd_eckd.c
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@ -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