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| author | Boris BREZILLON <boris.brezillon@free-electrons.com> | 2014-09-02 09:50:18 +0200 |
|---|---|---|
| committer | Mike Turquette <mturquette@linaro.org> | 2014-09-02 15:37:26 -0700 |
| commit | 16eeaec77922c1349e130a9541e83a023deaf11f (patch) | |
| tree | ffbcb2e73a8582170af39d32893236756f5cba39 /drivers/clk/at91 | |
| parent | 13a6073d4c5db3103011eebe8c68b049323ced20 (diff) | |
| download | linux-16eeaec77922c1349e130a9541e83a023deaf11f.tar.gz linux-16eeaec77922c1349e130a9541e83a023deaf11f.tar.bz2 linux-16eeaec77922c1349e130a9541e83a023deaf11f.zip | |
clk: at91: fix div by zero in USB clock driver
Test rate value before calculating the div value to avoid div by zero.
Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Reported-by: Gaël PORTAY <gael.portay@gmail.com>
Tested-by: Gaël PORTAY <gael.portay@gmail.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk/at91')
| -rw-r--r-- | drivers/clk/at91/clk-usb.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/clk/at91/clk-usb.c b/drivers/clk/at91/clk-usb.c index 183877712c6c..24b5b020753a 100644 --- a/drivers/clk/at91/clk-usb.c +++ b/drivers/clk/at91/clk-usb.c @@ -279,10 +279,13 @@ static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate, int i; struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); struct at91_pmc *pmc = usb->pmc; - unsigned long div = parent_rate / rate; + unsigned long div; - if (parent_rate % rate) + if (!rate || parent_rate % rate) return -EINVAL; + + div = parent_rate / rate; + for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) { if (usb->divisors[i] == div) { tmp = pmc_read(pmc, AT91_CKGR_PLLBR) & |