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authorM. Mohan Kumar <mohan@in.ibm.com>2011-04-15 13:59:33 +0530
committerEric Van Hensbergen <ericvh@strongbad.austin.rr.com>2011-05-09 22:51:12 -0500
commit3cd7967825a2b3926dc96ae566d986c4420919f7 (patch)
treefa8e4421ff3fada4da92bb8015ea3a5ce73a0e53 /net/9p/trans_common.c
parent26822eebb25500fb0776c7c256a6af041e9f538b (diff)
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>
Diffstat (limited to 'net/9p/trans_common.c')
-rw-r--r--net/9p/trans_common.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/net/9p/trans_common.c b/net/9p/trans_common.c
index e883172f9aa..9a70ebdec56 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;