V4L/DVB (11898): cx18: Perform 64 bit divide so it works for 32 bit systems

Thanks to David Ward and Mike Krufky for reporting the problem and
debugging this as an unresolved symbol due to a 64 bit divide on a 32 bit
system.  David Ward provided the content of this patch; Andy Walls only
performed some cosmetic edits.

Reported-by: David Ward <david.ward@gatech.edu>
Signed-off-by: David Ward <david.ward@gatech.edu>
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/cx18/cx18-av-core.c b/drivers/media/video/cx18/cx18-av-core.c
index 0b3d840cc2e2c2f23f09e84cf7e4c8a32ba59882..536dedb23ba36cb3080a53c0e958c6049d20300c 100644 (file)
--- a/drivers/media/video/cx18/cx18-av-core.c
+++ b/drivers/media/video/cx18/cx18-av-core.c
@@ -447,6 +447,7 @@ void cx18_av_std_setup(struct cx18 *cx)
 
        if (pll_post) {
                int fsc, pll;
+               u64 tmp;
 
                pll = (28636360L * ((((u64)pll_int) << 25) + pll_frac)) >> 25;
                pll /= pll_post;
@@ -459,7 +460,9 @@ void cx18_av_std_setup(struct cx18 *cx)
                                    "= %d.%03d\n", src_decimation / 256,
                                    ((src_decimation % 256) * 1000) / 256);
 
-               fsc = ((((u64)sc) * 28636360)/src_decimation) >> 13L;
+               tmp = 28636360 * (u64) sc;
+               do_div(tmp, src_decimation);
+               fsc = tmp >> 13;
                CX18_DEBUG_INFO_DEV(sd,
                                    "Chroma sub-carrier initial freq = %d.%06d "
                                    "MHz\n", fsc / 1000000, fsc % 1000000);