net/9p: Handle get_user_pages_fast return properly

Use proper data type to handle get_user_pages_fast error condition. Also
do not treat EFAULT error as fatal.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

2 files changed, 4 insertions, 9 deletions

diff --git a/net/9p/client.c b/net/9p/client.c
index 77367745be9b..a9aa2dd66482 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -614,7 +614,7 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 
         err = c->trans_mod->request(c, req);
         if (err < 0) {
-                if (err != -ERESTARTSYS)
+                if (err != -ERESTARTSYS && err != -EFAULT)
                         c->status = Disconnected;
                 goto reterr;
         }
diff --git a/net/9p/trans_common.c b/net/9p/trans_common.c
index e883172f9aa2..9a70ebdec56e 100644
--- a/net/9p/trans_common.c
+++ b/net/9p/trans_common.c
@@ -63,7 +63,7 @@ p9_payload_gup(struct p9_req_t *req, size_t *pdata_off, int *pdata_len,
                 int nr_pages, u8 rw)
 {
         uint32_t first_page_bytes = 0;
-        uint32_t pdata_mapped_pages;
+        int32_t pdata_mapped_pages;
         struct trans_rpage_info  *rpinfo;
 
         *pdata_off = (__force size_t)req->tc->pubuf & (PAGE_SIZE-1);
@@ -75,14 +75,9 @@ p9_payload_gup(struct p9_req_t *req, size_t *pdata_off, int *pdata_len,
         rpinfo = req->tc->private;
         pdata_mapped_pages = get_user_pages_fast((unsigned long)req->tc->pubuf,
                         nr_pages, rw, &rpinfo->rp_data[0]);
+        if (pdata_mapped_pages <= 0)
+                return pdata_mapped_pages;
 
-        if (pdata_mapped_pages < 0) {
-                printk(KERN_ERR "get_user_pages_fast failed:%d udata:%p"
-                                "nr_pages:%d\n", pdata_mapped_pages,
-                                req->tc->pubuf, nr_pages);
-                pdata_mapped_pages = 0;
-                return -EIO;
-        }
         rpinfo->rp_nr_pages = pdata_mapped_pages;
         if (*pdata_off) {
                 *pdata_len = first_page_bytes;