gpu: nvgpu: Move error notifier free to Linux module

Freeing error notifier involves calling dma_buf API, which is Linux
specific. Move the free to happen in Linux specific channel close
path.

JIRA NVGPU-65

Change-Id: Ifd8b31bb8c8af13975c34add00f51dd869cfd76a
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1498583
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/ioctl_channel.c b/drivers/gpu/nvgpu/common/linux/ioctl_channel.c
index 2c9fac0b..a083cb81 100644
--- a/drivers/gpu/nvgpu/common/linux/ioctl_channel.c
+++ b/drivers/gpu/nvgpu/common/linux/ioctl_channel.c
@@ -180,6 +180,19 @@ static int gk20a_channel_set_wdt_status(struct channel_gk20a *ch,
         return 0;
 }
 
+static void gk20a_channel_free_error_notifiers(struct channel_gk20a *ch)
+{
+        nvgpu_mutex_acquire(&ch->error_notifier_mutex);
+        if (ch->error_notifier_ref) {
+                dma_buf_vunmap(ch->error_notifier_ref, ch->error_notifier_va);
+                dma_buf_put(ch->error_notifier_ref);
+                ch->error_notifier_ref = NULL;
+                ch->error_notifier = NULL;
+                ch->error_notifier_va = NULL;
+        }
+        nvgpu_mutex_release(&ch->error_notifier_mutex);
+}
+
 static int gk20a_init_error_notifier(struct channel_gk20a *ch,
                 struct nvgpu_set_error_notifier *args)
 {
@@ -262,6 +275,8 @@ int gk20a_channel_release(struct inode *inode, struct file *filp)
         trace_gk20a_channel_release(dev_name(g->dev));
 
         gk20a_channel_close(ch);
+        gk20a_channel_free_error_notifiers(ch);
+
         gk20a_idle(g);
 
 channel_release: