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pm_rps: Use unbuffered I/O on sysfs files

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Bionic C library may not re-read a buffered, read-only file which
results in failure to monitor changes in gt_cur_freq_mhz.

Signed-off-by: Jeff McGee <jeff.mcgee@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jeff McGee 2014-01-10 15:12:30 -06:00 committed by Daniel Vetter
parent 45d63644d2
commit 265efbb2c4
1 changed files with 2 additions and 5 deletions
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7
tests/pm_rps.c
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@ -22,6 +22,7 @@
*
* Authors:
* Ben Widawsky <ben@bwidawsk.net>
* Jeff McGee <jeff.mcgee@intel.com>
*
*/
@ -66,7 +67,6 @@ static int readval(FILE *filp)
int val;
int scanned;
fflush(filp);
rewind(filp);
scanned = fscanf(filp, "%d", &val);
igt_assert(scanned == 1);
@ -76,15 +76,11 @@ static int readval(FILE *filp)
static int do_writeval(FILE *filp, int val, int lerrno)
{
/* Must write twice to sysfs since the first one simply calculates the size and won't return the error */
int ret;
rewind(filp);
ret = fprintf(filp, "%d", val);
rewind(filp);
ret = fprintf(filp, "%d", val);
if (ret && lerrno)
igt_assert(errno = lerrno);
fflush(filp);
return ret;
}
#define writeval(filp, val) do_writeval(filp, val, 0)
@ -146,6 +142,7 @@ igt_simple_main
igt_assert(ret != -1);
junk->filp = fopen(path, junk->mode);
igt_require(junk->filp);
setbuf(junk->filp, NULL);
val = readval(junk->filp);
igt_assert(val >= 0);