From 5b686ccd2ea6351473537ad1baf19252fbbceade Mon Sep 17 00:00:00 2001 From: Fabian Frederick Date: Fri, 28 Apr 2017 13:10:39 +0100 Subject: [PATCH] staging: media: atomisp: kmap() can't fail 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 Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- .../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 358872393646..57295397da3e 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; -- 2.20.1