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gem_reg_read: Only check errno after a definite error

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As upon success, errno is invalid and may give spurious false results.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65157
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-05-30 08:37:48 +01:00
parent 1cb4f90946
commit 2e1c11546a
1 changed files with 11 additions and 18 deletions
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29
tests/gem_reg_read.c
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@ -37,11 +37,11 @@ struct local_drm_i915_reg_read {
#define REG_READ_IOCTL DRM_IOWR(DRM_COMMAND_BASE + 0x31, struct local_drm_i915_reg_read)
static void handle_bad(int ret, int lerrno, int expected, const char *desc)
static void handle_bad(int ret, int expected, const char *desc)
{
if (ret != 0 && lerrno != expected) {
if (ret != 0 && errno != expected) {
fprintf(stderr, "%s - errno was %d, but should have been %d\n",
desc, lerrno, expected);
desc, errno, expected);
exit(EXIT_FAILURE);
} else if (ret == 0) {
fprintf(stderr, "%s - Command succeeded, but should have failed\n",
@ -53,11 +53,9 @@ static void handle_bad(int ret, int lerrno, int expected, const char *desc)
static uint64_t timer_query(int fd)
{
struct local_drm_i915_reg_read reg_read;
int ret;
reg_read.offset = 0x2358;
ret = drmIoctl(fd, REG_READ_IOCTL, &reg_read);
if (ret) {
if (drmIoctl(fd, REG_READ_IOCTL, &reg_read)) {
perror("positive test case failed: ");
exit(EXIT_FAILURE);
}
@ -68,31 +66,26 @@ static uint64_t timer_query(int fd)
int main(int argc, char *argv[])
{
struct local_drm_i915_reg_read reg_read;
int ret, fd;
uint64_t val;
int fd;
fd = drm_open_any();
reg_read.offset = 0x2358;
ret = drmIoctl(fd, REG_READ_IOCTL, &reg_read);
if (errno == EINVAL)
exit(77);
else if (ret)
exit(EXIT_FAILURE);
if (drmIoctl(fd, REG_READ_IOCTL, &reg_read))
exit(errno == EINVAL ? 77 : EXIT_FAILURE);
val = timer_query(fd);
reg_read.val = timer_query(fd);
sleep(1);
if (timer_query(fd) == val) {
if (timer_query(fd) == reg_read.val) {
fprintf(stderr, "Timer isn't moving, probably busted\n");
exit(EXIT_FAILURE);
}
/* bad reg */
reg_read.offset = 0x12345678;
ret = drmIoctl(fd, REG_READ_IOCTL, &reg_read);
handle_bad(ret, errno, EINVAL, "bad register");
handle_bad(drmIoctl(fd, REG_READ_IOCTL, &reg_read),
EINVAL, "bad register");
close(fd);
exit(EXIT_SUCCESS);
}