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s390/dasd: split up dasd_eckd_read_conf 

Move the cabling check out of dasd_eckd_read_conf and split it up into
separate functions to improve readability and re-use functions.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Link: https://lore.kernel.org/r/20211020115124.1735254-4-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Haberland 2021-10-20 13:51:20 +02:00 committed by Jens Axboe
parent 10c78e53ee
commit 23596961b4
1 changed files with 51 additions and 79 deletions
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126
drivers/s390/block/dasd_eckd.c
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@ -1071,15 +1071,55 @@ static void dasd_eckd_read_fc_security(struct dasd_device *device)
}
}
static void dasd_eckd_get_uid_string(struct dasd_eckd_private *private,
char *print_uid)
{
struct dasd_uid *uid;
uid = &private->uid;
if (strlen(uid->vduit) > 0)
snprintf(print_uid, sizeof(*print_uid),
"%s.%s.%04x.%02x.%s",
uid->vendor, uid->serial, uid->ssid,
uid->real_unit_addr, uid->vduit);
else
snprintf(print_uid, sizeof(*print_uid),
"%s.%s.%04x.%02x",
uid->vendor, uid->serial, uid->ssid,
uid->real_unit_addr);
}
static int dasd_eckd_check_cabling(struct dasd_device *device,
void *conf_data, __u8 lpm)
{
struct dasd_eckd_private *private = device->private;
char print_path_uid[60], print_device_uid[60];
struct dasd_eckd_private path_private;
path_private.conf_data = conf_data;
path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
if (dasd_eckd_identify_conf_parts(&path_private))
return 1;
if (dasd_eckd_compare_path_uid(device, &path_private)) {
dasd_eckd_get_uid_string(&path_private, print_path_uid);
dasd_eckd_get_uid_string(private, print_device_uid);
dev_err(&device->cdev->dev,
"Not all channel paths lead to the same device, path %02X leads to device %s instead of %s\n",
lpm, print_path_uid, print_device_uid);
return 1;
}
return 0;
}
static int dasd_eckd_read_conf(struct dasd_device *device)
{
void *conf_data;
int conf_len, conf_data_saved;
int rc, path_err, pos;
__u8 lpm, opm;
struct dasd_eckd_private *private, path_private;
struct dasd_uid *uid;
char print_path_uid[60], print_device_uid[60];
struct dasd_eckd_private *private;
private = device->private;
opm = ccw_device_get_path_mask(device->cdev);
@ -1123,60 +1163,12 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
*/
dasd_eckd_generate_uid(device);
conf_data_saved++;
} else {
path_private.conf_data = conf_data;
path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
if (dasd_eckd_identify_conf_parts(
&path_private)) {
path_private.conf_data = NULL;
path_private.conf_len = 0;
} else if (dasd_eckd_check_cabling(device, conf_data, lpm)) {
dasd_path_add_cablepm(device, lpm);
path_err = -EINVAL;
kfree(conf_data);
continue;
}
if (dasd_eckd_compare_path_uid(
device, &path_private)) {
uid = &path_private.uid;
if (strlen(uid->vduit) > 0)
snprintf(print_path_uid,
sizeof(print_path_uid),
"%s.%s.%04x.%02x.%s",
uid->vendor, uid->serial,
uid->ssid, uid->real_unit_addr,
uid->vduit);
else
snprintf(print_path_uid,
sizeof(print_path_uid),
"%s.%s.%04x.%02x",
uid->vendor, uid->serial,
uid->ssid,
uid->real_unit_addr);
uid = &private->uid;
if (strlen(uid->vduit) > 0)
snprintf(print_device_uid,
sizeof(print_device_uid),
"%s.%s.%04x.%02x.%s",
uid->vendor, uid->serial,
uid->ssid, uid->real_unit_addr,
uid->vduit);
else
snprintf(print_device_uid,
sizeof(print_device_uid),
"%s.%s.%04x.%02x",
uid->vendor, uid->serial,
uid->ssid,
uid->real_unit_addr);
dev_err(&device->cdev->dev,
"Not all channel paths lead to "
"the same device, path %02X leads to "
"device %s instead of %s\n", lpm,
print_path_uid, print_device_uid);
path_err = -EINVAL;
dasd_path_add_cablepm(device, lpm);
continue;
}
path_private.conf_data = NULL;
path_private.conf_len = 0;
}
pos = pathmask_to_pos(lpm);
dasd_eckd_store_conf_data(device, conf_data, pos);
@ -1300,7 +1292,6 @@ static void dasd_eckd_path_available_action(struct dasd_device *device,
struct pe_handler_work_data *data)
{
struct dasd_eckd_private path_private;
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;
@ -1397,19 +1388,8 @@ static void dasd_eckd_path_available_action(struct dasd_device *device,
if (rebuild_device_uid(device, data) ||
dasd_eckd_compare_path_uid(
device, &path_private)) {
uid = &path_private.uid;
if (strlen(uid->vduit) > 0)
snprintf(print_uid, sizeof(print_uid),
"%s.%s.%04x.%02x.%s",
uid->vendor, uid->serial,
uid->ssid, uid->real_unit_addr,
uid->vduit);
else
snprintf(print_uid, sizeof(print_uid),
"%s.%s.%04x.%02x",
uid->vendor, uid->serial,
uid->ssid,
uid->real_unit_addr);
dasd_eckd_get_uid_string(&path_private,
print_uid);
dev_err(&device->cdev->dev,
"The newly added channel path %02X "
"will not be used because it leads "
@ -5820,15 +5800,7 @@ static int dasd_eckd_reload_device(struct dasd_device *device)
dasd_eckd_get_uid(device, &uid);
if (old_base != uid.base_unit_addr) {
if (strlen(uid.vduit) > 0)
snprintf(print_uid, sizeof(print_uid),
"%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
uid.ssid, uid.base_unit_addr, uid.vduit);
else
snprintf(print_uid, sizeof(print_uid),
"%s.%s.%04x.%02x", uid.vendor, uid.serial,
uid.ssid, uid.base_unit_addr);
dasd_eckd_get_uid_string(private, print_uid);
dev_info(&device->cdev->dev,
"An Alias device was reassigned to a new base device "
"with UID: %s\n", print_uid);