diff --git a/drivers/s390/block/dasd_eer.c b/drivers/s390/block/dasd_eer.c
index 29da4413ad437b789dd78f104f894b396f99e386..bf512ac75b9e640f058cf1d1b8ddbd2d9490134a 100644
--- a/drivers/s390/block/dasd_eer.c
+++ b/drivers/s390/block/dasd_eer.c
@@ -16,6 +16,7 @@
 #include <linux/poll.h>
 #include <linux/mutex.h>
 #include <linux/smp_lock.h>
+#include <linux/err.h>
 
 #include <asm/uaccess.h>
 #include <asm/atomic.h>
@@ -457,7 +458,7 @@ int dasd_eer_enable(struct dasd_device *device)
 
 	cqr = dasd_kmalloc_request("ECKD", 1 /* SNSS */,
 				   SNSS_DATA_SIZE, device);
-	if (!cqr)
+	if (IS_ERR(cqr))
 		return -ENOMEM;
 
 	cqr->startdev = device;
diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c
index 687720b552d1c460019c8aa40a758294538195dd..be0ce2215c8de2d1214dd75d0330b850edc84885 100644
--- a/drivers/s390/char/tape_char.c
+++ b/drivers/s390/char/tape_char.c
@@ -109,7 +109,7 @@ tapechar_check_idalbuffer(struct tape_device *device, size_t block_size)
 
 	/* The current idal buffer is not correct. Allocate a new one. */
 	new = idal_buffer_alloc(block_size, 0);
-	if (new == NULL)
+	if (IS_ERR(new))
 		return -ENOMEM;
 
 	if (device->char_data.idal_buf != NULL)
diff --git a/drivers/s390/char/tape_std.c b/drivers/s390/char/tape_std.c
index 2a1af4e60be0919226217471beec3b1ea8f2b7b7..cc8fd781ee227ce6e8f1ae38956b2fb002fe5ad6 100644
--- a/drivers/s390/char/tape_std.c
+++ b/drivers/s390/char/tape_std.c
@@ -248,7 +248,7 @@ tape_std_mtsetblk(struct tape_device *device, int count)
 
 	/* Allocate a new idal buffer. */
 	new = idal_buffer_alloc(count, 0);
-	if (new == NULL)
+	if (IS_ERR(new))
 		return -ENOMEM;
 	if (device->char_data.idal_buf != NULL)
 		idal_buffer_free(device->char_data.idal_buf);