[PATCH i-g-t] tests/intel/xe_oa: Call get_stream_status only on EIO

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

Turns out that get_stream_status resets errno and anything that checks
errno afterwards fails. This resulted in a bunch of test failures. Fix
it by calling get_stream_status only if errno is EIO and also save and
restore errno within get_stream_status.

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/issues/4804
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
 tests/intel/xe_oa.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/tests/intel/xe_oa.c b/tests/intel/xe_oa.c
index 1fc8bfaafee2..360dd8ba00d9 100644
--- a/tests/intel/xe_oa.c
+++ b/tests/intel/xe_oa.c
@@ -380,9 +380,11 @@ static void set_fd_flags(int fd, int flags)
 static u32 get_stream_status(int fd)
 {
 	struct drm_xe_oa_stream_status status;
+	int _e = errno;
 
 	do_ioctl(fd, DRM_XE_OBSERVATION_IOCTL_STATUS, &status);
 	igt_debug("oa status %llx\n", status.oa_status);
+	errno = _e; 
 
 	return status.oa_status;
 }
@@ -2294,7 +2296,8 @@ static void test_polling_small_buf(void)
 	errno = 0;
 	ret = read(stream_fd, buf, sizeof(buf));
 	igt_assert_eq(ret, -1);
-	get_stream_status(stream_fd);
+	if (errno == EIO)
+		get_stream_status(stream_fd);
 	igt_assert_eq(errno, ENOSPC);
 
 	/* Poll with 0 timeout and expect POLLIN flag to be set */
@@ -2569,7 +2572,8 @@ test_enable_disable(const struct drm_xe_engine_class_instance *hwe)
 	errno = 0;
 	ret = read(stream_fd, buf, sizeof(buf));
 	igt_assert_eq(ret, -1);
-	get_stream_status(stream_fd);
+	if (errno == EIO)
+		get_stream_status(stream_fd);
 	igt_assert_eq(errno, EINVAL);
 
 	do_ioctl(stream_fd, DRM_XE_OBSERVATION_IOCTL_ENABLE, 0);
@@ -2586,7 +2590,8 @@ test_enable_disable(const struct drm_xe_engine_class_instance *hwe)
 	/* Ensure num_reports can be read */
 	while ((ret = read(stream_fd, buf, sizeof(buf))) < 0 && errno == EINTR)
 		;
-	get_stream_status(stream_fd);
+	if (errno == EIO)
+		get_stream_status(stream_fd);
 	igt_assert_eq(ret, sizeof(buf));
 
 	__perf_close(stream_fd);
@@ -2730,7 +2735,8 @@ test_non_sampling_read_error(void)
 
 	ret = read(stream_fd, buf, sizeof(buf));
 	igt_assert_eq(ret, -1);
-	get_stream_status(stream_fd);
+	if (errno == EIO)
+		get_stream_status(stream_fd);
 	igt_assert_eq(errno, EINVAL);
 
 	__perf_close(stream_fd);
@@ -2772,7 +2778,8 @@ test_disabled_read_error(void)
 
 	ret = read(stream_fd, buf, sizeof(buf));
 	igt_assert_eq(ret, -1);
-	get_stream_status(stream_fd);
+	if (errno == EIO)
+		get_stream_status(stream_fd);
 	igt_assert_eq(errno, EINVAL);
 
 	__perf_close(stream_fd);
@@ -2791,7 +2798,8 @@ test_disabled_read_error(void)
 
 	ret = read(stream_fd, buf, sizeof(buf));
 	igt_assert_eq(ret, -1);
-	get_stream_status(stream_fd);
+	if (errno == EIO)
+		get_stream_status(stream_fd);
 	igt_assert_eq(errno, EINVAL);
 
 	do_ioctl(stream_fd, DRM_XE_OBSERVATION_IOCTL_ENABLE, 0);
-- 
2.45.2