[PATCH] ehca: fix do_mmap() error check

[Akinobu Mita <akinobu.mita@gmail.com>]

The return value of do_mmap() should be checked by IS_ERR().

Cc: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Cc: Christoph Raisch <raisch@de.ibm.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>

---
 drivers/infiniband/hw/ehca/ehca_uverbs.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: 2.6-mm/drivers/infiniband/hw/ehca/ehca_uverbs.c
===================================================================
--- 2.6-mm.orig/drivers/infiniband/hw/ehca/ehca_uverbs.c
+++ 2.6-mm/drivers/infiniband/hw/ehca/ehca_uverbs.c
@@ -321,14 +321,14 @@ int ehca_mmap_nopage(u64 foffset, u64 le
 		     struct vm_area_struct **vma)
 {
 	down_write(&current->mm->mmap_sem);
-	*mapped = (void*)do_mmap(NULL,0, length, PROT_WRITE,
+	*mapped = (void*)do_mmap(NULL, 0, length, PROT_WRITE,
 				 MAP_SHARED | MAP_ANONYMOUS,
 				 foffset);
 	up_write(&current->mm->mmap_sem);
-	if (!(*mapped)) {
+	if (IS_ERR(*mapped)) {
 		ehca_gen_err("couldn't mmap foffset=%lx length=%lx",
 			     foffset, length);
-		return -EINVAL;
+		return PTR_ERR(*mmaped);
 	}
 
 	*vma = find_vma(current->mm, (u64)*mapped);