Defining the return value of round_rate as a long and returning error codes as well as the rounded-clock value in the return value of a clk_ops->round_rate callback means that its not possible to return a clock greater than LONG_MAX Hz on a 32 bit system.
This patch changes the handling of the return value from round_rate() such that zero indicates an unusable clock and non-zero indicates a successfully rounded clock giving us a full range of 1 Hz to ULONG_MAX Hz on 32 bit systems. Implementations of round_rate() must either return a rounded-clock or zero to indicate error. Signed-off-by: Bryan O'Donoghue <[email protected]> Cc: Michael Turquette <[email protected]> Cc: Stephen Boyd <[email protected]> Cc: [email protected] Cc: [email protected] --- drivers/clk/clk-composite.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c index f3707c3..2090b74 100644 --- a/drivers/clk/clk-composite.c +++ b/drivers/clk/clk-composite.c @@ -66,7 +66,7 @@ static int clk_composite_determine_rate(struct clk_hw *hw, long tmp_rate, best_rate = 0; unsigned long rate_diff; unsigned long best_rate_diff = ULONG_MAX; - long rate; + unsigned long rate; int i; if (rate_hw && rate_ops && rate_ops->determine_rate) { @@ -83,8 +83,8 @@ static int clk_composite_determine_rate(struct clk_hw *hw, rate = rate_ops->round_rate(rate_hw, req->rate, &req->best_parent_rate); - if (rate < 0) - return rate; + if (!rate) + return -EINVAL; req->rate = rate; return 0; @@ -99,7 +99,7 @@ static int clk_composite_determine_rate(struct clk_hw *hw, tmp_rate = rate_ops->round_rate(rate_hw, req->rate, &parent_rate); - if (tmp_rate < 0) + if (tmp_rate == 0) continue; rate_diff = abs(req->rate - tmp_rate); -- 2.7.4
