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From 7c5a4b52de95b3b49f5cc40a9a3b7ddb0e3d063e Mon Sep 17 00:00:00 2001
From: Jonathan Kim <jonathan.kim@amd.com>
Date: Mon, 12 Aug 2019 11:47:28 -0400
Subject: [PATCH 3542/4256] drm/amdkfd: updated read to set errno to eagain
User space requries -1 and errno set to EAGAIN on kfifo_to_user
failure or 0 bytes copy.
Change-Id: I34985ff641b21568e12bf5534bd39d1d5d744364
Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_debug_events.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_debug_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_debug_events.c
index 210cccdeed81..df42b1dd8b4b 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_debug_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_debug_events.c
@@ -70,9 +70,10 @@ static ssize_t kfd_dbg_ev_read(struct file *filep, char __user *user,
ret = kfifo_to_user(&dpd->fifo, user, size, &copied);
- if (ret) {
- pr_debug("KFD DEBUG EVENT: Failed to read poll fd (%i)\n", ret);
- return ret;
+ if (ret || !copied) {
+ pr_debug("KFD DEBUG EVENT: Failed to read poll fd (%i) (%i)\n",
+ ret, copied);
+ return ret ? ret : -EAGAIN;
}
return copied;
--
2.17.1
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