If the PLL calc function is given bad parameters, n_start/m_start may be higher than n_stop/m_stop, which leads to the loops iterating through the whole u32 number space.
Fix this by failing early on such cases.
Signed-off-by: Tomi Valkeinen tomi.valkeinen@ti.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com --- drivers/gpu/drm/omapdrm/dss/pll.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/omapdrm/dss/pll.c b/drivers/gpu/drm/omapdrm/dss/pll.c index 1212f3cc52d1..12926218c436 100644 --- a/drivers/gpu/drm/omapdrm/dss/pll.c +++ b/drivers/gpu/drm/omapdrm/dss/pll.c @@ -222,6 +222,9 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin, n_stop = min((unsigned)(clkin / fint_hw_min), hw->n_max); n_inc = 1;
+ if (n_start > n_stop) + return false; + if (hw->errata_i886) { swap(n_start, n_stop); n_inc = -1; @@ -239,6 +242,9 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin, hw->m_max); m_inc = 1;
+ if (m_start > m_stop) + continue; + if (hw->errata_i886) { swap(m_start, m_stop); m_inc = -1;