linux-kernel - [PATCH] staging: media: atomisp: remove pointless string copy

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Date:   Fri,  2 Feb 2018 16:19:41 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Alan Cox <alan@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Jérémy Lefaure 
        <jeremy.lefaure@....epita.fr>, Sergiy Redko <sergredko@...il.com>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] staging: media: atomisp: remove pointless string copy

gcc-8 points out that a string is copied to itself here:

In file included from drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/platform_support.h:25,
                 from drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/memory_access/memory_access.h:48,
                 from drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c:16:
In function 'strncpy',
    inlined from 'ia_css_debug_pipe_graph_dump_stage' at drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/string_support.h:158:2:
include/linux/string.h:253:9: error: '__builtin_strncpy' source argument is the same as destination [-Werror=restrict]
  return __builtin_strncpy(p, q, size);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This removes the bogus code, leaving the behavior otherwise
unchanged.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 .../atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c b/drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c
index f22d73b56bc6..60395904f89a 100644
--- a/drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/debug/src/ia_css_debug.c
@@ -2858,13 +2858,7 @@ ia_css_debug_pipe_graph_dump_stage(
 			if (l && enable_info[l-1] == ',')
 				enable_info[--l] = '\0';
 
-			if (l <= ENABLE_LINE_MAX_LENGTH) {
-				/* It fits on one line, copy string and init */
-				/* other helper strings with empty string */
-				strcpy_s(enable_info,
-					sizeof(enable_info),
-					ei);
-			} else {
+			if (l > ENABLE_LINE_MAX_LENGTH) {
 				/* Too big for one line, find last comma */
 				p = ENABLE_LINE_MAX_LENGTH;
 				while (ei[p] != ',')
-- 
2.9.0