[PATCH] drm/gma500: Fix possible null pointer dereference on sender

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

There is a null pointer sanity check on sender after sender is earlier
dereferenced on the intialization of drm_device dev. Move this
dereference to after sender is sanity checked to avoid the null
pointer dereference.  Issue found with static analysis using CoverityScan.

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c 
b/drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c
index 1616af2..37b1030 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;
@@ -538,6 +538,7 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender 
*sender, u8 data_type,
         */
        spin_lock_irqsave(&sender->lock, flags);

+       dev = sender->dev;
        REG_WRITE(sender->mipi_intr_stat_reg, BIT(29));

        if ((REG_READ(sender->mipi_intr_stat_reg) & BIT(29)))
-- 
2.9.3