sender is dereferrenced before NULL check struct drm_device *dev = sender->dev;
and due to there is warning during static analysis: warn: variable dereferenced before check 'sender'
__read_panel_data Function is called by mdfld_dsi_read_mcs and there is a same check, Thus removing the check from mdfld_dsi_read_mcs and initializing dev struct after NULL check of sender.
Suggested-by: Patrick Jakobsson patrick.r.jakobsson@gmail.com Signed-off-by: Maninder Singh maninder1.s@samsung.com Reviewed-by: Vaneet Narang v.narang@samsung.com --- v1: removes check from __read_panel_data v2: remove check from mdfld_dsi_read_mcs instead of __read_panel_data
drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c b/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c index 6b43ae3..959aaeb 100644 --- a/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c +++ b/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c @@ -520,7 +520,7 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender *sender, u8 data_type, u8 *data, u16 len, u32 *data_out, u16 len_out, bool hs) { unsigned long flags; - struct drm_device *dev = sender->dev; + struct drm_device *dev; int i; u32 gen_data_reg; int retry = MDFLD_DSI_READ_MAX_COUNT; @@ -530,6 +530,8 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender *sender, u8 data_type, return -EINVAL; }
+ dev = sender->dev; + /** * do reading. * 0) send out generic read request @@ -576,11 +578,6 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender *sender, u8 data_type, int mdfld_dsi_read_mcs(struct mdfld_dsi_pkg_sender *sender, u8 cmd, u32 *data, u16 len, bool hs) { - if (!sender || !data || !len) { - DRM_ERROR("Invalid parameters\n"); - return -EINVAL; - } - return __read_panel_data(sender, MIPI_DSI_DCS_READ, &cmd, 1, data, len, hs); }