drm/omap: fix NULL deref crash with SDI displays

Fix a NULL deref bug introduced in commit 24aac6011f70 ("drm: omapdrm:
sdi: Allocate the sdi private data structure dynamically").

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/2f803bfc-3ffe-332a-7b9a-d59a39db4630@ti.com
Fixes: 24aac6011f70 ("drm: omapdrm: sdi: Allocate the sdi private data structure dynamically")
Reported-by: Tony Lindgren <tony@atomide.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>

diff --git a/drivers/gpu/drm/omapdrm/dss/sdi.c b/drivers/gpu/drm/omapdrm/dss/sdi.c
index 68a40ae..1e2c931 100644 (file)
--- a/drivers/gpu/drm/omapdrm/dss/sdi.c
+++ b/drivers/gpu/drm/omapdrm/dss/sdi.c
@@ -82,7 +82,7 @@ static int sdi_calc_clock_div(struct sdi_device *sdi, unsigned long pclk,
                              struct dispc_clock_info *dispc_cinfo)
 {
        int i;
-       struct sdi_clk_calc_ctx ctx = { .sdi = sdi };
+       struct sdi_clk_calc_ctx ctx;
 
        /*
         * DSS fclk gives us very few possibilities, so finding a good pixel
@@ -95,6 +95,9 @@ static int sdi_calc_clock_div(struct sdi_device *sdi, unsigned long pclk,
                bool ok;
 
                memset(&ctx, 0, sizeof(ctx));
+
+               ctx.sdi = sdi;
+
                if (pclk > 1000 * i * i * i)
                        ctx.pck_min = max(pclk - 1000 * i * i * i, 0lu);
                else