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| author | Antti Palosaari <crope@iki.fi> | 2014-04-10 21:18:16 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-07 13:25:40 -0700 |
| commit | 4f792a2972e6f320484abfc940f978177131facc (patch) | |
| tree | 70fe4918fda0584b6be50592c94615f889b195d2 | |
| parent | 0a4e3565df0c91bf0f7a68dee09e45c9d9b2d360 (diff) | |
| download | lwn-4f792a2972e6f320484abfc940f978177131facc.tar.gz lwn-4f792a2972e6f320484abfc940f978177131facc.zip | |
media: fc2580: fix tuning failure on 32-bit arch
commit 8845cc6415ec28ef8d57b3fb81c75ef9bce69c5f upstream.
There was some frequency calculation overflows which caused tuning
failure on 32-bit architecture. Use 64-bit numbers where needed in
order to avoid calculation overflows.
Thanks for the Finnish person, who asked remain anonymous, reporting,
testing and suggesting the fix.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/media/tuners/fc2580.c | 6 | ||||
| -rw-r--r-- | drivers/media/tuners/fc2580_priv.h | 1 |
2 files changed, 4 insertions, 3 deletions
diff --git a/drivers/media/tuners/fc2580.c b/drivers/media/tuners/fc2580.c index 3aecaf465094..f0c9c42867de 100644 --- a/drivers/media/tuners/fc2580.c +++ b/drivers/media/tuners/fc2580.c @@ -195,7 +195,7 @@ static int fc2580_set_params(struct dvb_frontend *fe) f_ref = 2UL * priv->cfg->clock / r_val; n_val = div_u64_rem(f_vco, f_ref, &k_val); - k_val_reg = 1UL * k_val * (1 << 20) / f_ref; + k_val_reg = div_u64(1ULL * k_val * (1 << 20), f_ref); ret = fc2580_wr_reg(priv, 0x18, r18_val | ((k_val_reg >> 16) & 0xff)); if (ret < 0) @@ -348,8 +348,8 @@ static int fc2580_set_params(struct dvb_frontend *fe) if (ret < 0) goto err; - ret = fc2580_wr_reg(priv, 0x37, 1UL * priv->cfg->clock * \ - fc2580_if_filter_lut[i].mul / 1000000000); + ret = fc2580_wr_reg(priv, 0x37, div_u64(1ULL * priv->cfg->clock * + fc2580_if_filter_lut[i].mul, 1000000000)); if (ret < 0) goto err; diff --git a/drivers/media/tuners/fc2580_priv.h b/drivers/media/tuners/fc2580_priv.h index be38a9e637e0..646c99452136 100644 --- a/drivers/media/tuners/fc2580_priv.h +++ b/drivers/media/tuners/fc2580_priv.h @@ -22,6 +22,7 @@ #define FC2580_PRIV_H #include "fc2580.h" +#include <linux/math64.h> struct fc2580_reg_val { u8 reg; |