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gpu: nvgpu: Add fix for dev_node leak

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This is adding fix for dev_node leak when user_deinit
called.
The dev_nodes in linux are created in two phases. In first
phase the power dev_nodes(one for legacy and other for v2)
are created. The second phase other dev_nodes are created.
While creating the dev_nodes the power cdev_region overwritten
by cdev_region. This is fixed by introducing new cdev_region and
updating respective nodes.

JIRA NVGPU-6721

Change-Id: Iec78db8e5fe40cc0b14fb3fecc35b8881dff716f
Signed-off-by: dt <dt@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2535265
Reviewed-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Lakshmanan M <lm@nvidia.com>
Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
dt
2021-05-26 16:07:23 +00:00
committed by mobile promotions
parent 3c671e28e5
commit c1b302652e
2 changed files with 9 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/nvgpu/os/linux/ioctl.c
View File

@@ -314,6 +314,10 @@ void gk20a_user_deinit(struct device *dev)
nvgpu_kfree(g, cdev);
}
if (l->power_cdev_region) {
unregister_chrdev_region(l->power_cdev_region, l->power_cdevs);
}
if (l->cdev_region) {
unregister_chrdev_region(l->cdev_region, l->num_cdevs);
l->num_cdevs = 0;
@@ -560,7 +564,7 @@ int gk20a_power_node_init(struct device *dev)
goto fail;
}
l->cdev_region = devno;
l->power_cdev_region = devno;
nvgpu_list_for_each_entry(class, &l->class_list_head, nvgpu_class, list_entry) {
cdev = nvgpu_kzalloc(g, sizeof(*cdev));
if (cdev == NULL) {
@@ -586,7 +590,7 @@ int gk20a_power_node_init(struct device *dev)
nvgpu_list_add(&cdev->list_entry, &l->cdev_list_head);
}
l->num_cdevs = total_cdevs;
l->power_cdevs = total_cdevs;
return 0;
fail:
gk20a_user_deinit(dev);
@@ -674,7 +678,7 @@ int gk20a_user_init(struct device *dev)
}
}
l->num_cdevs += total_cdevs;
l->num_cdevs = total_cdevs;
return 0;
fail:

2
drivers/gpu/nvgpu/os/linux/os_linux.h
View File

@@ -77,10 +77,12 @@ struct nvgpu_os_linux {
struct nvgpu_list_node class_list_head;
struct nvgpu_list_node cdev_list_head;
u32 power_cdevs;
u32 num_cdevs;
bool dev_nodes_created;
bool cdev_list_init_done;
dev_t power_cdev_region;
dev_t cdev_region;
/* see gk20a_ctrl_priv */