[S390] dasd: check_characteristics cleanup

Fix a broken memset (sizeof pointer vs sizeof the underlying
structure) by cleaning up the involved functions.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

4 files changed, 18 insertions, 19 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 27a1be0cd4d4..35f43bea5d07 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2427,12 +2427,12 @@ static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
 
 
 int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic,
-                                void **rdc_buffer, int rdc_buffer_size)
+                                void *rdc_buffer, int rdc_buffer_size)
 {
         int ret;
         struct dasd_ccw_req *cqr;
 
-        cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size,
+        cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
                                      magic);
         if (IS_ERR(cqr))
                 return PTR_ERR(cqr);
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 81f8819eaf19..c4e818111a40 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1097,20 +1097,20 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
 {
         struct dasd_eckd_private *private;
         struct dasd_block *block;
-        void *rdc_data;
         int is_known, rc;
 
         private = (struct dasd_eckd_private *) device->private;
-        if (private == NULL) {
-                private = kzalloc(sizeof(struct dasd_eckd_private),
-                                  GFP_KERNEL | GFP_DMA);
-                if (private == NULL) {
+        if (!private) {
+                private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
+                if (!private) {
                         dev_warn(&device->cdev->dev,
                                  "Allocating memory for private DASD data "
                                  "failed\n");
                         return -ENOMEM;
                 }
                 device->private = (void *) private;
+        } else {
+                memset(private, 0, sizeof(*private));
         }
         /* Invalidate status of initial analysis. */
         private->init_cqr_status = -1;
@@ -1161,9 +1161,8 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
                 goto out_err3;
 
         /* Read Device Characteristics */
-        rdc_data = (void *) &(private->rdc_data);
-        memset(rdc_data, 0, sizeof(rdc_data));
-        rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
+        rc = dasd_generic_read_dev_chars(device, "ECKD", &private->rdc_data,
+                                         64);
         if (rc) {
                 DBF_EVENT(DBF_WARNING,
                           "Read device characteristics failed, rc=%d for "
@@ -1183,7 +1182,7 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
                  private->rdc_data.dev_model,
                  private->rdc_data.cu_type,
                  private->rdc_data.cu_model.model,
-                    private->real_cyl,
+                 private->real_cyl,
                  private->rdc_data.trk_per_cyl,
                  private->rdc_data.sec_per_trk);
         return 0;
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 8912358daa2f..8c3c8ffbc8bf 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -122,20 +122,20 @@ dasd_fba_check_characteristics(struct dasd_device *device)
         struct dasd_block *block;
         struct dasd_fba_private *private;
         struct ccw_device *cdev = device->cdev;
-        void *rdc_data;
         int rc;
 
         private = (struct dasd_fba_private *) device->private;
-        if (private == NULL) {
-                private = kzalloc(sizeof(struct dasd_fba_private),
-                                  GFP_KERNEL | GFP_DMA);
-                if (private == NULL) {
+        if (!private) {
+                private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
+                if (!private) {
                         dev_warn(&device->cdev->dev,
                                  "Allocating memory for private DASD "
                                  "data failed\n");
                         return -ENOMEM;
                 }
                 device->private = (void *) private;
+        } else {
+                memset(private, 0, sizeof(*private));
         }
         block = dasd_alloc_block();
         if (IS_ERR(block)) {
@@ -150,8 +150,8 @@ dasd_fba_check_characteristics(struct dasd_device *device)
         block->base = device;
 
         /* Read Device Characteristics */
-        rdc_data = (void *) &(private->rdc_data);
-        rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
+        rc = dasd_generic_read_dev_chars(device, "FBA ", &private->rdc_data,
+                                         32);
         if (rc) {
                 DBF_EVENT(DBF_WARNING, "Read device characteristics returned "
                           "error %d for device: %s",
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index c1e487f774c6..3ab69b5a41f6 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -578,7 +578,7 @@ int dasd_generic_set_offline (struct ccw_device *cdev);
 int dasd_generic_notify(struct ccw_device *, int);
 void dasd_generic_handle_state_change(struct dasd_device *);
 
-int dasd_generic_read_dev_chars(struct dasd_device *, char *, void **, int);
+int dasd_generic_read_dev_chars(struct dasd_device *, char *, void *, int);
 char *dasd_get_sense(struct irb *);
 
 /* externals in dasd_devmap.c */