From: Sasha Levin <sashal@kernel.org> To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Arnd Bergmann <arnd@arndb.de>, Nathan Chancellor <natechancellor@gmail.com>, Lad Prabhakar <prabhakar.csengg@gmail.com>, Hans Verkuil <hverkuil-cisco@xs4all.nl>, Mauro Carvalho Chehab <mchehab+samsung@kernel.org>, Sasha Levin <sashal@kernel.org>, linux-media@vger.kernel.org, clang-built-linux@googlegroups.com Subject: [PATCH AUTOSEL 4.4 066/174] media: davinci-isif: avoid uninitialized variable use Date: Thu, 16 Jan 2020 12:41:03 -0500 Message-ID: <20200116174251.24326-66-sashal@kernel.org> (raw) In-Reply-To: <20200116174251.24326-1-sashal@kernel.org> From: Arnd Bergmann <arnd@arndb.de> [ Upstream commit 0e633f97162c1c74c68e2eb20bbd9259dce87cd9 ] clang warns about a possible variable use that gcc never complained about: drivers/media/platform/davinci/isif.c:982:32: error: variable 'frame_size' is uninitialized when used here [-Werror,-Wuninitialized] dm365_vpss_set_pg_frame_size(frame_size); ^~~~~~~~~~ drivers/media/platform/davinci/isif.c:887:2: note: variable 'frame_size' is declared here struct vpss_pg_frame_size frame_size; ^ 1 error generated. There is no initialization for this variable at all, and there has never been one in the mainline kernel, so we really should not put that stack data into an mmio register. On the other hand, I suspect that gcc checks the condition more closely and notices that the global isif_cfg.bayer.config_params.test_pat_gen flag is initialized to zero and never written to from any code path, so anything depending on it can be eliminated. To shut up the clang warning, just remove the dead code manually, it has probably never been used because any attempt to do so would have resulted in undefined behavior. Fixes: 63e3ab142fa3 ("V4L/DVB: V4L - vpfe capture - source for ISIF driver on DM365") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Acked-by: Lad Prabhakar <prabhakar.csengg@gmail.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/media/platform/davinci/isif.c | 9 --------- 1 file changed, 9 deletions(-) diff --git a/drivers/media/platform/davinci/isif.c b/drivers/media/platform/davinci/isif.c index 78e37cf3470f..b51b875c5a61 100644 --- a/drivers/media/platform/davinci/isif.c +++ b/drivers/media/platform/davinci/isif.c @@ -890,9 +890,7 @@ static int isif_set_hw_if_params(struct vpfe_hw_if_param *params) static int isif_config_ycbcr(void) { struct isif_ycbcr_config *params = &isif_cfg.ycbcr; - struct vpss_pg_frame_size frame_size; u32 modeset = 0, ccdcfg = 0; - struct vpss_sync_pol sync; dev_dbg(isif_cfg.dev, "\nStarting isif_config_ycbcr..."); @@ -980,13 +978,6 @@ static int isif_config_ycbcr(void) /* two fields are interleaved in memory */ regw(0x00000249, SDOFST); - /* Setup test pattern if enabled */ - if (isif_cfg.bayer.config_params.test_pat_gen) { - sync.ccdpg_hdpol = params->hd_pol; - sync.ccdpg_vdpol = params->vd_pol; - dm365_vpss_set_sync_pol(sync); - dm365_vpss_set_pg_frame_size(frame_size); - } return 0; } -- 2.20.1
next prev parent reply index Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20200116174251.24326-1-sashal@kernel.org> 2020-01-16 17:40 ` [PATCH AUTOSEL 4.4 032/174] media: s5p-jpeg: Correct step and max values for V4L2_CID_JPEG_RESTART_INTERVAL Sasha Levin 2020-01-16 17:40 ` [PATCH AUTOSEL 4.4 059/174] media: ivtv: update *pos correctly in ivtv_read_pos() Sasha Levin 2020-01-16 17:40 ` [PATCH AUTOSEL 4.4 060/174] media: cx18: update *pos correctly in cx18_read_pos() Sasha Levin 2020-01-16 17:40 ` [PATCH AUTOSEL 4.4 061/174] media: wl128x: Fix an error code in fm_download_firmware() Sasha Levin 2020-01-16 17:40 ` [PATCH AUTOSEL 4.4 062/174] media: cx23885: check allocation return Sasha Levin 2020-01-16 17:41 ` Sasha Levin [this message] 2020-01-16 17:41 ` [PATCH AUTOSEL 4.4 078/174] media: ov2659: fix unbalanced mutex_lock/unlock Sasha Levin 2020-01-16 17:41 ` [PATCH AUTOSEL 4.4 086/174] media: omap_vout: potential buffer overflow in vidioc_dqbuf() Sasha Levin 2020-01-16 17:41 ` [PATCH AUTOSEL 4.4 087/174] media: davinci/vpbe: array underflow in vpbe_enum_outputs() Sasha Levin 2020-01-16 17:41 ` [PATCH AUTOSEL 4.4 099/174] media: vivid: fix incorrect assignment operation when setting video mode Sasha Levin 2020-01-16 17:42 ` [PATCH AUTOSEL 4.4 152/174] media: ov6650: Fix incorrect use of JPEG colorspace Sasha Levin 2020-01-16 17:42 ` [PATCH AUTOSEL 4.4 153/174] media: ov6650: Fix some format attributes not under control Sasha Levin 2020-01-16 17:42 ` [PATCH AUTOSEL 4.4 154/174] media: ov6650: Fix .get_fmt() V4L2_SUBDEV_FORMAT_TRY support Sasha Levin 2020-01-16 17:42 ` [PATCH AUTOSEL 4.4 161/174] media: exynos4-is: Fix recursive locking in isp_video_release() Sasha Levin
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