[PATCH v2 06/10] s390/dasd: Store path configuration data during path handling

Stefan Haberland
2020-10-08T13:13:43Z

From: Jan Höppner <hoeppner@linux.ibm.com>

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.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
[sth@linux.ibm.com: fix conf_data memleak]
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
---
drivers/s390/block/dasd_eckd.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 497aa81778b6..3ff7b532a5bf 100644
--- 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
--
2.17.1