[PATCH 8/8] staging: media: atomisp: kmap() can't fail

[Alan Cox]

From: Fabian Frederick <f...@skynet.be>

There's no need to check kmap() return value because it won't fail.
If it's highmem mapping, it will receive virtual address
or a new one; if it's lowmem, all kernel pages are already being mapped.

(Thanks to Jan Kara for explanations)

Signed-off-by: Fabian Frederick <f...@skynet.be>
Signed-off-by: Alan Cox <a...@linux.intel.com>
---
 .../staging/media/atomisp/pci/atomisp2/hmm/hmm.c   |   19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm.c 
b/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm.c
index 3588723..5729539 100644
--- a/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm.c
+++ b/drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm.c
@@ -333,15 +333,7 @@ static int load_and_flush_by_kmap(ia_css_ptr virt, void 
*data, unsigned int byte
                idx = (virt - bo->start) >> PAGE_SHIFT;
                offset = (virt - bo->start) - (idx << PAGE_SHIFT);
 
-               src = (char *)kmap(bo->page_obj[idx].page);
-               if (!src) {
-                       dev_err(atomisp_dev,
-                                   "kmap buffer object page failed: "
-                                   "pg_idx = %d\n", idx);
-                       return -EINVAL;
-               }
-
-               src += offset;
+               src = (char *)kmap(bo->page_obj[idx].page) + offset;
 
                if ((bytes + offset) >= PAGE_SIZE) {
                        len = PAGE_SIZE - offset;
@@ -538,14 +530,7 @@ int hmm_set(ia_css_ptr virt, int c, unsigned int bytes)
                idx = (virt - bo->start) >> PAGE_SHIFT;
                offset = (virt - bo->start) - (idx << PAGE_SHIFT);
 
-               des = (char *)kmap(bo->page_obj[idx].page);
-               if (!des) {
-                       dev_err(atomisp_dev,
-                                   "kmap buffer object page failed: "
-                                   "pg_idx = %d\n", idx);
-                       return -EINVAL;
-               }
-               des += offset;
+               des = (char *)kmap(bo->page_obj[idx].page) + offset;
 
                if ((bytes + offset) >= PAGE_SIZE) {
                        len = PAGE_SIZE - offset;