From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com
Subject: drivers/gpu/drm/drm_edid.c:2124:9: warning: Local variable 'block' shadows outer argument [shadowArgument]
Date: Mon, 7 Nov 2022 13:33:23 +0800 [thread overview]
Message-ID: <202211071354.QoWhF7P7-lkp@intel.com> (raw)
::::::
:::::: Manual check reason: "low confidence static check warning: drivers/gpu/drm/drm_edid.c:2124:9: warning: Local variable 'block' shadows outer argument [shadowArgument]"
::::::
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Jani Nikula <jani.nikula@intel.com>
CC: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: f0c4d9fc9cc9462659728d168387191387e903cc
commit: 89fb7536ad2fdcdaf95eee44b9e162d0522f48dc drm/edid: add typedef for block read function
date: 7 months ago
:::::: branch date: 6 hours ago
:::::: commit date: 7 months ago
compiler: sh4-linux-gcc (GCC) 12.1.0
reproduce (cppcheck warning):
# apt-get install cppcheck
git checkout 89fb7536ad2fdcdaf95eee44b9e162d0522f48dc
cppcheck --quiet --enable=style,performance,portability --template=gcc FILE
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
cppcheck warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/drm_modes.c:1852:16: warning: Local variable 'len' shadows outer variable [shadowVariable]
unsigned int len = strlen(mode_option);
^
drivers/gpu/drm/drm_modes.c:1788:9: note: Shadowed declaration
int i, len, ret;
^
drivers/gpu/drm/drm_modes.c:1852:16: note: Shadow variable
unsigned int len = strlen(mode_option);
^
--
cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
>> drivers/gpu/drm/solomon/ssd130x.c:383:68: warning: Parameter 'buf' can be declared as pointer to const [constParameter]
static int ssd130x_update_rect(struct ssd130x_device *ssd130x, u8 *buf,
^
--
>> drivers/gpu/drm/drm_mipi_dsi.c:307:73: warning: Parameter 'node' can be declared as pointer to const [constParameter]
struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
^
--
>> drivers/gpu/drm/drm_edid.c:2124:9: warning: Local variable 'block' shadows outer argument [shadowArgument]
void *block = edid + j;
^
drivers/gpu/drm/drm_edid.c:2101:0: note: Shadowed declaration
read_block_fn read_block,
^
drivers/gpu/drm/drm_edid.c:2124:9: note: Shadow variable
void *block = edid + j;
^
vim +/block +2124 drivers/gpu/drm/drm_edid.c
bac9c29482248b Douglas Anderson 2021-09-14 2079
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2080 /**
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2081 * drm_do_get_edid - get EDID data using a custom EDID block read function
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2082 * @connector: connector we're probing
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2083 * @get_edid_block: EDID block read function
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2084 * @data: private data passed to the block read function
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2085 *
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2086 * When the I2C adapter connected to the DDC bus is hidden behind a device that
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2087 * exposes a different interface to read EDID blocks this function can be used
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2088 * to get EDID data using a custom block read function.
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2089 *
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2090 * As in the general case the DDC bus is accessible by the kernel at the I2C
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2091 * level, drivers must make all reasonable efforts to expose it as an I2C
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2092 * adapter and use drm_get_edid() instead of abusing this function.
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2093 *
0ae865ef92f192 Cai Huoqing 2021-07-30 2094 * The EDID may be overridden using debugfs override_edid or firmware EDID
53fd40a90f3c0b Jani Nikula 2017-09-12 2095 * (drm_load_edid_firmware() and drm.edid_firmware parameter), in this priority
53fd40a90f3c0b Jani Nikula 2017-09-12 2096 * order. Having either of them bypasses actual EDID reads.
53fd40a90f3c0b Jani Nikula 2017-09-12 2097 *
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2098 * Return: Pointer to valid EDID or NULL if we couldn't find any.
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2099 */
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2100 struct edid *drm_do_get_edid(struct drm_connector *connector,
89fb7536ad2fdc Jani Nikula 2022-04-11 2101 read_block_fn read_block,
89fb7536ad2fdc Jani Nikula 2022-04-11 2102 void *context)
61e57a8d72f233 Adam Jackson 2010-03-29 2103 {
ccc97def44ecc0 Jani Nikula 2022-03-31 2104 int j, invalid_blocks = 0;
e9a9e0768ba49d Jani Nikula 2022-03-31 2105 struct edid *edid, *new, *override;
53fd40a90f3c0b Jani Nikula 2017-09-12 2106
56a2b7f2a39a8d Jani Nikula 2019-06-07 2107 override = drm_get_override_edid(connector);
56a2b7f2a39a8d Jani Nikula 2019-06-07 2108 if (override)
53fd40a90f3c0b Jani Nikula 2017-09-12 2109 return override;
61e57a8d72f233 Adam Jackson 2010-03-29 2110
89fb7536ad2fdc Jani Nikula 2022-04-11 2111 edid = drm_do_get_edid_base_block(connector, read_block, context);
e7bd95a7ed4e4c Douglas Anderson 2021-10-04 2112 if (!edid)
61e57a8d72f233 Adam Jackson 2010-03-29 2113 return NULL;
61e57a8d72f233 Adam Jackson 2010-03-29 2114
ccc97def44ecc0 Jani Nikula 2022-03-31 2115 if (edid->extensions == 0)
e9a9e0768ba49d Jani Nikula 2022-03-31 2116 return edid;
61e57a8d72f233 Adam Jackson 2010-03-29 2117
ccc97def44ecc0 Jani Nikula 2022-03-31 2118 new = krealloc(edid, (edid->extensions + 1) * EDID_LENGTH, GFP_KERNEL);
61e57a8d72f233 Adam Jackson 2010-03-29 2119 if (!new)
61e57a8d72f233 Adam Jackson 2010-03-29 2120 goto out;
f14f368670541b Chris Wilson 2016-10-17 2121 edid = new;
61e57a8d72f233 Adam Jackson 2010-03-29 2122
e9a9e0768ba49d Jani Nikula 2022-03-31 2123 for (j = 1; j <= edid->extensions; j++) {
e9a9e0768ba49d Jani Nikula 2022-03-31 @2124 void *block = edid + j;
18d83450468ca5 Jani Nikula 2022-03-31 2125 int try;
a28187ccab9410 Chris Wilson 2016-10-17 2126
18d83450468ca5 Jani Nikula 2022-03-31 2127 for (try = 0; try < 4; try++) {
89fb7536ad2fdc Jani Nikula 2022-04-11 2128 if (read_block(context, block, j, EDID_LENGTH))
61e57a8d72f233 Adam Jackson 2010-03-29 2129 goto out;
14544d0937bf01 Chris Wilson 2016-10-24 2130 if (drm_edid_block_valid(block, j, false, NULL))
61e57a8d72f233 Adam Jackson 2010-03-29 2131 break;
61e57a8d72f233 Adam Jackson 2010-03-29 2132 }
f934ec8c34b9dc Maarten Lankhorst 2013-01-29 2133
18d83450468ca5 Jani Nikula 2022-03-31 2134 if (try == 4)
ccc97def44ecc0 Jani Nikula 2022-03-31 2135 invalid_blocks++;
0ea75e23356f73 Sam Tygier 2010-09-23 2136 }
0ea75e23356f73 Sam Tygier 2010-09-23 2137
ccc97def44ecc0 Jani Nikula 2022-03-31 2138 if (invalid_blocks) {
63cae081538de1 Jani Nikula 2022-04-11 2139 connector_bad_edid(connector, edid, edid->extensions + 1);
14544d0937bf01 Chris Wilson 2016-10-24 2140
ccc97def44ecc0 Jani Nikula 2022-03-31 2141 edid = edid_filter_invalid_blocks(edid, invalid_blocks);
61e57a8d72f233 Adam Jackson 2010-03-29 2142 }
61e57a8d72f233 Adam Jackson 2010-03-29 2143
e9a9e0768ba49d Jani Nikula 2022-03-31 2144 return edid;
61e57a8d72f233 Adam Jackson 2010-03-29 2145
61e57a8d72f233 Adam Jackson 2010-03-29 2146 out:
f14f368670541b Chris Wilson 2016-10-17 2147 kfree(edid);
61e57a8d72f233 Adam Jackson 2010-03-29 2148 return NULL;
61e57a8d72f233 Adam Jackson 2010-03-29 2149 }
18df89fef2d5c7 Lars-Peter Clausen 2012-04-27 2150 EXPORT_SYMBOL_GPL(drm_do_get_edid);
61e57a8d72f233 Adam Jackson 2010-03-29 2151
:::::: The code at line 2124 was first introduced by commit
:::::: e9a9e0768ba49d9cad3b698860af1842c53c717f drm/edid: use struct edid * in drm_do_get_edid()
:::::: TO: Jani Nikula <jani.nikula@intel.com>
:::::: CC: Jani Nikula <jani.nikula@intel.com>
--
0-DAY CI Kernel Test Service
https://01.org/lkp
next reply other threads:[~2022-11-07 5:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-07 5:33 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2023-02-21 22:49 drivers/gpu/drm/drm_edid.c:2124:9: warning: Local variable 'block' shadows outer argument [shadowArgument] kernel test robot
2023-01-13 6:05 kernel test robot
2022-06-16 3:43 kernel test robot
2022-06-15 10:33 kernel test robot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=202211071354.QoWhF7P7-lkp@intel.com \
--to=lkp@intel.com \
--cc=oe-kbuild@lists.linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.