4.19-stable review patch. If anyone has any objections, please let me know.
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From: Jonathan Marek jonathan@marek.ca
[ Upstream commit 358b762400bd94db2a14a72dfcef74c7da6bd845 ]
When (mode->clock * 1000) is larger than (1<<31), int to unsigned long conversion will sign extend the int to 64 bits and the pclk_rate value will be incorrect.
Fix this by making the result of the multiplication unsigned.
Note that above (1<<32) would still be broken and require more changes, but its unlikely anyone will need that anytime soon.
Fixes: c4d8cfe516dc ("drm/msm/dsi: add implementation for helper functions") Signed-off-by: Jonathan Marek jonathan@marek.ca Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Reviewed-by: Abhinav Kumar quic_abhinavk@quicinc.com Patchwork: https://patchwork.freedesktop.org/patch/618434/ Link: https://lore.kernel.org/r/20241007050157.26855-2-jonathan@marek.ca Signed-off-by: Abhinav Kumar quic_abhinavk@quicinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/msm/dsi/dsi_host.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index 5f4dd3659bf96..137c0ec1b5772 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -671,7 +671,7 @@ static u32 dsi_get_pclk_rate(struct msm_dsi_host *msm_host, bool is_dual_dsi) struct drm_display_mode *mode = msm_host->mode; u32 pclk_rate;
- pclk_rate = mode->clock * 1000; + pclk_rate = mode->clock * 1000u;
/* * For dual DSI mode, the current DRM mode has the complete width of the