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Subject[RFC PATCH 24/60] hyper_dmabuf: waits for resp only if WAIT_AFTER_SYNC_REQ == 1
Date
hyper_dmabuf's sync_request (previously hyper_dmabuf_sync_request_
and_wait) now does not wait for the response from exporter if
WAIT_AFTER_SYNC_REQ==0. This is to prevent peformance degradation
due to the communication latency while doing indirect hyper DMABUF
synchronization.

This patch also includes some minor changes as followed:

1. hyper_dmabuf_free_sgt is removed. Now we call sg_free_table and
kfree directly from all the places where this function was executed.
This was done for conciseness.

2. changed hyper_dmabuf_get_domid to hyper_dmabuf_xen_get_domid for
consistence in func names in the backend.

3. some minor clean-ups

Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
---
drivers/xen/hyper_dmabuf/hyper_dmabuf_conf.h | 2 -
drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c | 91 +++++++++++-----------
drivers/xen/hyper_dmabuf/hyper_dmabuf_msg.c | 2 -
.../xen/hyper_dmabuf/hyper_dmabuf_remote_sync.c | 2 +-
.../xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.c | 14 ++--
.../xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.h | 2 +-
.../xen/hyper_dmabuf/xen/hyper_dmabuf_xen_drv.c | 2 +-
.../xen/hyper_dmabuf/xen/hyper_dmabuf_xen_shm.c | 21 +++--
8 files changed, 69 insertions(+), 67 deletions(-)

diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_conf.h b/drivers/xen/hyper_dmabuf/hyper_dmabuf_conf.h
index ee1886c..d5125f2 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_conf.h
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_conf.h
@@ -23,5 +23,3 @@
*/

/* configuration */
-
-#define CURRENT_TARGET XEN
diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c b/drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c
index a017070..d7a35fc 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c
@@ -131,7 +131,7 @@ struct hyper_dmabuf_pages_info *hyper_dmabuf_ext_pgs(struct sg_table *sgt)

/* create sg_table with given pages and other parameters */
struct sg_table* hyper_dmabuf_create_sgt(struct page **pages,
- int frst_ofst, int last_len, int nents)
+ int frst_ofst, int last_len, int nents)
{
struct sg_table *sgt;
struct scatterlist *sgl;
@@ -144,7 +144,11 @@ struct sg_table* hyper_dmabuf_create_sgt(struct page **pages,

ret = sg_alloc_table(sgt, nents, GFP_KERNEL);
if (ret) {
- hyper_dmabuf_free_sgt(sgt);
+ if (sgt) {
+ sg_free_table(sgt);
+ kfree(sgt);
+ }
+
return NULL;
}

@@ -165,15 +169,6 @@ struct sg_table* hyper_dmabuf_create_sgt(struct page **pages,
return sgt;
}

-/* free sg_table */
-void hyper_dmabuf_free_sgt(struct sg_table* sgt)
-{
- if (sgt) {
- sg_free_table(sgt);
- kfree(sgt);
- }
-}
-
int hyper_dmabuf_cleanup_sgt_info(struct hyper_dmabuf_sgt_info *sgt_info, int force)
{
struct sgt_list *sgtl;
@@ -264,7 +259,9 @@ int hyper_dmabuf_cleanup_sgt_info(struct hyper_dmabuf_sgt_info *sgt_info, int fo
return 0;
}

-inline int hyper_dmabuf_sync_request_and_wait(int id, int dmabuf_ops)
+#define WAIT_AFTER_SYNC_REQ 1
+
+inline int hyper_dmabuf_sync_request(int id, int dmabuf_ops)
{
struct hyper_dmabuf_req *req;
struct hyper_dmabuf_backend_ops *ops = hyper_dmabuf_private.backend_ops;
@@ -279,7 +276,7 @@ inline int hyper_dmabuf_sync_request_and_wait(int id, int dmabuf_ops)
hyper_dmabuf_create_request(req, HYPER_DMABUF_OPS_TO_SOURCE, &operands[0]);

/* send request and wait for a response */
- ret = ops->send_req(HYPER_DMABUF_DOM_ID(id), req, true);
+ ret = ops->send_req(HYPER_DMABUF_DOM_ID(id), req, WAIT_AFTER_SYNC_REQ);

kfree(req);

@@ -297,8 +294,8 @@ static int hyper_dmabuf_ops_attach(struct dma_buf* dmabuf, struct device* dev,

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)attach->dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_ATTACH);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_ATTACH);

if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
@@ -319,8 +316,8 @@ static void hyper_dmabuf_ops_detach(struct dma_buf* dmabuf, struct dma_buf_attac

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)attach->dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_DETACH);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_DETACH);

if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
@@ -354,8 +351,8 @@ static struct sg_table* hyper_dmabuf_ops_map(struct dma_buf_attachment *attachme
goto err_free_sg;
}

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_MAP);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_MAP);

kfree(page_info->pages);
kfree(page_info);
@@ -390,8 +387,8 @@ static void hyper_dmabuf_ops_unmap(struct dma_buf_attachment *attachment,
sg_free_table(sg);
kfree(sg);

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_UNMAP);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_UNMAP);

if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
@@ -419,19 +416,23 @@ static void hyper_dmabuf_ops_release(struct dma_buf *dma_buf)

if (sgt_info->num_importers == 0) {
ops->unmap_shared_pages(&sgt_info->refs_info, sgt_info->nents);
- hyper_dmabuf_free_sgt(sgt_info->sgt);
- sgt_info->sgt = NULL;
+
+ if (sgt_info->sgt) {
+ sg_free_table(sgt_info->sgt);
+ kfree(sgt_info->sgt);
+ sgt_info->sgt = NULL;
+ }
}

final_release = sgt_info && !sgt_info->valid &&
!sgt_info->num_importers;

if (final_release) {
- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_RELEASE_FINAL);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_RELEASE_FINAL);
} else {
- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_RELEASE);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_RELEASE);
}

if (ret < 0) {
@@ -459,8 +460,8 @@ static int hyper_dmabuf_ops_begin_cpu_access(struct dma_buf *dmabuf, enum dma_da

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_BEGIN_CPU_ACCESS);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_BEGIN_CPU_ACCESS);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
@@ -479,8 +480,8 @@ static int hyper_dmabuf_ops_end_cpu_access(struct dma_buf *dmabuf, enum dma_data

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_END_CPU_ACCESS);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_END_CPU_ACCESS);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
@@ -499,8 +500,8 @@ static void *hyper_dmabuf_ops_kmap_atomic(struct dma_buf *dmabuf, unsigned long

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_KMAP_ATOMIC);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_KMAP_ATOMIC);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
@@ -519,8 +520,8 @@ static void hyper_dmabuf_ops_kunmap_atomic(struct dma_buf *dmabuf, unsigned long

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_KUNMAP_ATOMIC);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_KUNMAP_ATOMIC);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
@@ -537,8 +538,8 @@ static void *hyper_dmabuf_ops_kmap(struct dma_buf *dmabuf, unsigned long pgnum)

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_KMAP);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_KMAP);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
@@ -557,8 +558,8 @@ static void hyper_dmabuf_ops_kunmap(struct dma_buf *dmabuf, unsigned long pgnum,

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_KUNMAP);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_KUNMAP);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
@@ -575,8 +576,8 @@ static int hyper_dmabuf_ops_mmap(struct dma_buf *dmabuf, struct vm_area_struct *

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_MMAP);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_MMAP);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
@@ -595,8 +596,8 @@ static void *hyper_dmabuf_ops_vmap(struct dma_buf *dmabuf)

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_VMAP);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_VMAP);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
@@ -615,8 +616,8 @@ static void hyper_dmabuf_ops_vunmap(struct dma_buf *dmabuf, void *vaddr)

sgt_info = (struct hyper_dmabuf_imported_sgt_info *)dmabuf->priv;

- ret = hyper_dmabuf_sync_request_and_wait(sgt_info->hyper_dmabuf_id,
- HYPER_DMABUF_OPS_VUNMAP);
+ ret = hyper_dmabuf_sync_request(sgt_info->hyper_dmabuf_id,
+ HYPER_DMABUF_OPS_VUNMAP);
if (ret < 0) {
dev_err(hyper_dmabuf_private.device,
"hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_msg.c b/drivers/xen/hyper_dmabuf/hyper_dmabuf_msg.c
index b9bd6d8..c99176ac 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_msg.c
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_msg.c
@@ -39,8 +39,6 @@
#include "hyper_dmabuf_remote_sync.h"
#include "hyper_dmabuf_list.h"

-#define FORCED_UNEXPORTING 0
-
extern struct hyper_dmabuf_private hyper_dmabuf_private;

struct cmd_process {
diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_remote_sync.c b/drivers/xen/hyper_dmabuf/hyper_dmabuf_remote_sync.c
index 4c28f11..f93c936 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_remote_sync.c
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_remote_sync.c
@@ -53,7 +53,7 @@ extern struct hyper_dmabuf_private hyper_dmabuf_private;
* later when unmapping operations are invoked to free those.
*
* The very first element on the bottom of each stack holds
- * are what is created when initial exporting is issued so it
+ * is what is created when initial exporting is issued so it
* should not be modified or released by this fuction.
*/
int hyper_dmabuf_remote_sync(int id, int ops)
diff --git a/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.c b/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.c
index 14336c9..ba6b126 100644
--- a/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.c
+++ b/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.c
@@ -53,7 +53,7 @@ static int xen_comm_setup_data_dir(void)
{
char buf[255];

- sprintf(buf, "/local/domain/%d/data/hyper_dmabuf", hyper_dmabuf_get_domid());
+ sprintf(buf, "/local/domain/%d/data/hyper_dmabuf", hyper_dmabuf_xen_get_domid());
return xenbus_mkdir(XBT_NIL, buf, "");
}

@@ -67,7 +67,7 @@ static int xen_comm_destroy_data_dir(void)
{
char buf[255];

- sprintf(buf, "/local/domain/%d/data/hyper_dmabuf", hyper_dmabuf_get_domid());
+ sprintf(buf, "/local/domain/%d/data/hyper_dmabuf", hyper_dmabuf_xen_get_domid());
return xenbus_rm(XBT_NIL, buf, "");
}

@@ -130,7 +130,7 @@ static int xen_comm_get_ring_details(int domid, int rdomid, int *grefid, int *po
return (ret <= 0 ? 1 : 0);
}

-int hyper_dmabuf_get_domid(void)
+int hyper_dmabuf_xen_get_domid(void)
{
struct xenbus_transaction xbt;
int domid;
@@ -192,7 +192,7 @@ static void remote_dom_exporter_watch_cb(struct xenbus_watch *watch,
* it means that remote domain has setup it for us and we should connect
* to it.
*/
- ret = xen_comm_get_ring_details(hyper_dmabuf_get_domid(), rdom,
+ ret = xen_comm_get_ring_details(hyper_dmabuf_xen_get_domid(), rdom,
&grefid, &port);

if (ring_info && ret != 0) {
@@ -287,7 +287,7 @@ int hyper_dmabuf_xen_init_tx_rbuf(int domid)

ret = xen_comm_add_tx_ring(ring_info);

- ret = xen_comm_expose_ring_details(hyper_dmabuf_get_domid(), domid,
+ ret = xen_comm_expose_ring_details(hyper_dmabuf_xen_get_domid(), domid,
ring_info->gref_ring, ring_info->port);

/*
@@ -299,7 +299,7 @@ int hyper_dmabuf_xen_init_tx_rbuf(int domid)
ring_info->watch.node = (const char*) kmalloc(sizeof(char) * 255, GFP_KERNEL);
sprintf((char*)ring_info->watch.node,
"/local/domain/%d/data/hyper_dmabuf/%d/port",
- domid, hyper_dmabuf_get_domid());
+ domid, hyper_dmabuf_xen_get_domid());

register_xenbus_watch(&ring_info->watch);

@@ -368,7 +368,7 @@ int hyper_dmabuf_xen_init_rx_rbuf(int domid)
return 0;
}

- ret = xen_comm_get_ring_details(hyper_dmabuf_get_domid(), domid,
+ ret = xen_comm_get_ring_details(hyper_dmabuf_xen_get_domid(), domid,
&rx_gref, &rx_port);

if (ret) {
diff --git a/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.h b/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.h
index 298af08..9c93165 100644
--- a/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.h
+++ b/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_comm.h
@@ -50,7 +50,7 @@ struct xen_comm_rx_ring_info {
struct gnttab_unmap_grant_ref unmap_op;
};

-int hyper_dmabuf_get_domid(void);
+int hyper_dmabuf_xen_get_domid(void);

int hyper_dmabuf_xen_init_comm_env(void);

diff --git a/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_drv.c b/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_drv.c
index 6afb520..aa4c2f5 100644
--- a/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_drv.c
+++ b/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_drv.c
@@ -37,7 +37,7 @@
#include "hyper_dmabuf_xen_shm.h"

struct hyper_dmabuf_backend_ops xen_backend_ops = {
- .get_vm_id = hyper_dmabuf_get_domid,
+ .get_vm_id = hyper_dmabuf_xen_get_domid,
.share_pages = hyper_dmabuf_xen_share_pages,
.unshare_pages = hyper_dmabuf_xen_unshare_pages,
.map_shared_pages = (void *)hyper_dmabuf_xen_map_shared_pages,
diff --git a/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_shm.c b/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_shm.c
index 122aac1..b158c11 100644
--- a/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_shm.c
+++ b/drivers/xen/hyper_dmabuf/xen/hyper_dmabuf_xen_shm.c
@@ -108,8 +108,8 @@ int hyper_dmabuf_xen_share_pages(struct page **pages, int domid, int nents,
/* Share 2nd level addressing pages in readonly mode*/
for (i=0; i< n_lvl2_grefs; i++) {
lvl3_table[i] = gnttab_grant_foreign_access(domid,
- virt_to_mfn((unsigned long)lvl2_table+i*PAGE_SIZE ),
- 1);
+ virt_to_mfn((unsigned long)lvl2_table+i*PAGE_SIZE ),
+ 1);
}

/* Share lvl3_table in readonly mode*/
@@ -240,10 +240,12 @@ struct page ** hyper_dmabuf_xen_map_shared_pages(int lvl3_gref, int domid, int n

lvl3_table = (grant_ref_t *)pfn_to_kaddr(page_to_pfn(lvl3_table_page));

- gnttab_set_map_op(&lvl3_map_ops, (unsigned long)lvl3_table, GNTMAP_host_map | GNTMAP_readonly,
+ gnttab_set_map_op(&lvl3_map_ops, (unsigned long)lvl3_table,
+ GNTMAP_host_map | GNTMAP_readonly,
(grant_ref_t)lvl3_gref, domid);

- gnttab_set_unmap_op(&lvl3_unmap_ops, (unsigned long)lvl3_table, GNTMAP_host_map | GNTMAP_readonly, -1);
+ gnttab_set_unmap_op(&lvl3_unmap_ops, (unsigned long)lvl3_table,
+ GNTMAP_host_map | GNTMAP_readonly, -1);

if (gnttab_map_refs(&lvl3_map_ops, NULL, &lvl3_table_page, 1)) {
dev_err(hyper_dmabuf_private.device, "HYPERVISOR map grant ref failed");
@@ -285,8 +287,9 @@ struct page ** hyper_dmabuf_xen_map_shared_pages(int lvl3_gref, int domid, int n
/* Checks if pages were mapped correctly */
for (i = 0; i < n_lvl2_grefs; i++) {
if (lvl2_map_ops[i].status) {
- dev_err(hyper_dmabuf_private.device, "HYPERVISOR map grant ref failed status = %d",
- lvl2_map_ops[i].status);
+ dev_err(hyper_dmabuf_private.device,
+ "HYPERVISOR map grant ref failed status = %d",
+ lvl2_map_ops[i].status);
return NULL;
} else {
lvl2_unmap_ops[i].handle = lvl2_map_ops[i].handle;
@@ -344,7 +347,8 @@ struct page ** hyper_dmabuf_xen_map_shared_pages(int lvl3_gref, int domid, int n

for (i = 0; i < nents; i++) {
if (data_map_ops[i].status) {
- dev_err(hyper_dmabuf_private.device, "HYPERVISOR map grant ref failed status = %d\n",
+ dev_err(hyper_dmabuf_private.device,
+ "HYPERVISOR map grant ref failed status = %d\n",
data_map_ops[i].status);
return NULL;
} else {
@@ -376,7 +380,8 @@ int hyper_dmabuf_xen_unmap_shared_pages(void **refs_info, int nents) {

if (sh_pages_info->unmap_ops == NULL ||
sh_pages_info->data_pages == NULL) {
- dev_warn(hyper_dmabuf_private.device, "Imported pages already cleaned up or buffer was not imported yet\n");
+ dev_warn(hyper_dmabuf_private.device,
+ "Imported pages already cleaned up or buffer was not imported yet\n");
return 0;
}

--
2.7.4
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