From 2517b32bd9e178b0701f18f9ae8cc043f464dcea Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 8 Nov 2016 15:49:31 +0100 Subject: [PATCH] clk: pxa: fix pxa2xx_determine_rate return The new pxa2xx_determine_rate() function seems lacking in a few regards: - For an exact match or no match at all, the rate is uninitialized as reported by gcc -Wmaybe-unintialized: drivers/clk/pxa/clk-pxa.c: In function 'pxa2xx_determine_rate': drivers/clk/pxa/clk-pxa.c:243:5: error: 'rate' may be used uninitialized in this function - If we get a non-exact match, the req->rate output is never set to the actual rate but remains at the requested rate. - We should not attempt to print a rate if none could be found This rewrites the logic accordingly. Fixes: 9fe694295098 ("clk: pxa: transfer CPU clock setting from pxa2xx-cpufreq") Signed-off-by: Arnd Bergmann Acked-by: Robert Jarzmik Signed-off-by: Stephen Boyd --- drivers/clk/pxa/clk-pxa.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/clk/pxa/clk-pxa.c b/drivers/clk/pxa/clk-pxa.c index 50fb9d0ea58d..c423b064c753 100644 --- a/drivers/clk/pxa/clk-pxa.c +++ b/drivers/clk/pxa/clk-pxa.c @@ -211,7 +211,7 @@ void pxa2xx_cpll_change(struct pxa2xx_freq *freq, int pxa2xx_determine_rate(struct clk_rate_request *req, struct pxa2xx_freq *freqs, int nb_freqs) { - int i, closest_below = -1, closest_above = -1, ret = 0; + int i, closest_below = -1, closest_above = -1; unsigned long rate; for (i = 0; i < nb_freqs; i++) { @@ -230,18 +230,19 @@ int pxa2xx_determine_rate(struct clk_rate_request *req, req->best_parent_hw = NULL; - if (i < nb_freqs) - ret = 0; - else if (closest_below >= 0) + if (i < nb_freqs) { + rate = req->rate; + } else if (closest_below >= 0) { rate = freqs[closest_below].cpll; - else if (closest_above >= 0) + } else if (closest_above >= 0) { rate = freqs[closest_above].cpll; - else - ret = -EINVAL; + } else { + pr_debug("%s(rate=%lu) no match\n", __func__, req->rate); + return -EINVAL; + } - pr_debug("%s(rate=%lu) rate=%lu: %d\n", __func__, req->rate, rate, ret); - if (!rate) - req->rate = rate; + pr_debug("%s(rate=%lu) rate=%lu\n", __func__, req->rate, rate); + req->rate = rate; - return ret; + return 0; }