1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/char/hvc_iucv.c b/drivers/char/hvc_iucv.c
index b8a5d654d3d0..5a80ad68ef22 100644
--- a/drivers/char/hvc_iucv.c
+++ b/drivers/char/hvc_iucv.c
@@ -12,6 +12,7 @@
 #define pr_fmt(fmt)             KMSG_COMPONENT ": " fmt
 
 #include <linux/types.h>
+#include <linux/slab.h>
 #include <asm/ebcdic.h>
 #include <linux/ctype.h>
 #include <linux/delay.h>
@@ -139,6 +140,8 @@ struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num)
  *
  * This function allocates a new struct iucv_tty_buffer element and, optionally,
  * allocates an internal data buffer with the specified size @size.
+ * The internal data buffer is always allocated with GFP_DMA which is
+ * required for receiving and sending data with IUCV.
  * Note: The total message size arises from the internal buffer size and the
  *       members of the iucv_tty_msg structure.
  * The function returns NULL if memory allocation has failed.
@@ -154,7 +157,7 @@ static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags)
 
         if (size > 0) {
                 bufp->msg.length = MSG_SIZE(size);
-                bufp->mbuf = kmalloc(bufp->msg.length, flags);
+                bufp->mbuf = kmalloc(bufp->msg.length, flags | GFP_DMA);
                 if (!bufp->mbuf) {
                         mempool_free(bufp, hvc_iucv_mempool);
                         return NULL;
@@ -237,7 +240,7 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv,
         if (!rb->mbuf) { /* message not yet received ... */
                 /* allocate mem to store msg data; if no memory is available
                  * then leave the buffer on the list and re-try later */
-                rb->mbuf = kmalloc(rb->msg.length, GFP_ATOMIC);
+                rb->mbuf = kmalloc(rb->msg.length, GFP_ATOMIC | GFP_DMA);
                 if (!rb->mbuf)
                         return -ENOMEM;
 
@@ -922,7 +925,7 @@ static int hvc_iucv_pm_restore_thaw(struct device *dev)
 
 
 /* HVC operations */
-static struct hv_ops hvc_iucv_ops = {
+static const struct hv_ops hvc_iucv_ops = {
         .get_chars = hvc_iucv_get_chars,
         .put_chars = hvc_iucv_put_chars,
         .notifier_add = hvc_iucv_notifier_add,
@@ -931,7 +934,7 @@ static struct hv_ops hvc_iucv_ops = {
 };
 
 /* Suspend / resume device operations */
-static struct dev_pm_ops hvc_iucv_pm_ops = {
+static const struct dev_pm_ops hvc_iucv_pm_ops = {
         .freeze   = hvc_iucv_pm_freeze,
         .thaw     = hvc_iucv_pm_restore_thaw,
         .restore  = hvc_iucv_pm_restore_thaw,