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[v2,2/8] dvb-frontends: ves1820: use 64-bit arithmetic instead of 32-bit

Message ID 6e8742889d7c7f087e1b698409370bb5da5cd7ff.1517856716.git.gustavo@embeddedor.com (mailing list archive)
State New, archived
Headers show

Commit Message

Gustavo A. R. Silva Feb. 5, 2018, 8:06 p.m. UTC
Add suffix ULL to constant 10 in order to give the compiler complete
information about the proper arithmetic to use. Notice that this
constant is used in a context that expects an expression of type
u64 (64 bits, unsigned).

The expression fpxin = state->config->xin * 10 is currently being
evaluated using 32-bit arithmetic.

Addresses-Coverity-ID: 200604
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
Changes in v2:
 - Update subject and changelog to better reflect the proposed code changes.
 - Add suffix ULL to constant instead of casting a variable.

 drivers/media/dvb-frontends/ves1820.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/media/dvb-frontends/ves1820.c b/drivers/media/dvb-frontends/ves1820.c
index 1d89792..1760098 100644
--- a/drivers/media/dvb-frontends/ves1820.c
+++ b/drivers/media/dvb-frontends/ves1820.c
@@ -137,7 +137,7 @@  static int ves1820_set_symbolrate(struct ves1820_state *state, u32 symbolrate)
 		NDEC = 3;
 
 	/* yeuch! */
-	fpxin = state->config->xin * 10;
+	fpxin = state->config->xin * 10ULL;
 	fptmp = fpxin; do_div(fptmp, 123);
 	if (symbolrate < fptmp)
 		SFIL = 1;