s390/dasd: handle request magic consistently as unsigned int

Get rid of the rather odd casts to character pointer of the
dasd_ccw_req magic member and simply use the unsigned int value
unmodified everywhere.
Acked-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://lore.kernel.org/r/20211020115124.1735254-2-sth@linux.ibm.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/s390/block/dasd_3990_erp.c

@@ -201,7 +201,7 @@ dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier)
 	struct ccw1 *ccw;
 	struct dasd_ccw_req *dctl_cqr;
 
-	dctl_cqr = dasd_alloc_erp_request((char *) &erp->magic, 1,
+	dctl_cqr = dasd_alloc_erp_request(erp->magic, 1,
 					  sizeof(struct DCTL_data),
 					  device);
 	if (IS_ERR(dctl_cqr)) {
@@ -1652,7 +1652,7 @@ dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense)
 	}
 
 	/* Build new ERP request including DE/LO */
-	erp = dasd_alloc_erp_request((char *) &cqr->magic,
+	erp = dasd_alloc_erp_request(cqr->magic,
 				     2 + 1,/* DE/LO + TIC */
 				     sizeof(struct DE_eckd_data) +
 				     sizeof(struct LO_eckd_data), device);
@@ -2388,7 +2388,7 @@ static struct dasd_ccw_req *dasd_3990_erp_add_erp(struct dasd_ccw_req *cqr)
 	}
 
 	/* allocate additional request block */
-	erp = dasd_alloc_erp_request((char *) &cqr->magic,
+	erp = dasd_alloc_erp_request(cqr->magic,
 				     cplength, datasize, device);
 	if (IS_ERR(erp)) {
                 if (cqr->retries <= 0) {

drivers/s390/block/dasd_erp.c

@@ -24,7 +24,7 @@
 #include "dasd_int.h"
 
 struct dasd_ccw_req *
-dasd_alloc_erp_request(char *magic, int cplength, int datasize,
+dasd_alloc_erp_request(unsigned int magic, int cplength, int datasize,
 		       struct dasd_device * device)
 {
 	unsigned long flags;
@@ -33,8 +33,8 @@ dasd_alloc_erp_request(char *magic, int cplength, int datasize,
 	int size;
 
 	/* Sanity checks */
-	BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
-	     (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
+	BUG_ON(datasize > PAGE_SIZE ||
+	       (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
 
 	size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
 	if (cplength > 0)
@@ -62,7 +62,7 @@ dasd_alloc_erp_request(char *magic, int cplength, int datasize,
 		cqr->data = data;
  		memset(cqr->data, 0, datasize);
 	}
-	strncpy((char *) &cqr->magic, magic, 4);
+	cqr->magic = magic;
 	ASCEBC((char *) &cqr->magic, 4);
 	set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 	dasd_get_device(device);

drivers/s390/block/dasd_int.h

@@ -887,7 +887,7 @@ void dasd_proc_exit(void);
 /* externals in dasd_erp.c */
 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
-struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
+struct dasd_ccw_req *dasd_alloc_erp_request(unsigned int, int, int,
 					    struct dasd_device *);
 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);