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path: root/drivers/char/hvc_iucv.c
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Diffstat (limited to 'drivers/char/hvc_iucv.c')
-rw-r--r--drivers/char/hvc_iucv.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/char/hvc_iucv.c b/drivers/char/hvc_iucv.c
index 21681a8..37b0542 100644
--- a/drivers/char/hvc_iucv.c
+++ b/drivers/char/hvc_iucv.c
@@ -139,6 +139,8 @@ 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 +156,7 @@ 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 +239,7 @@ 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;