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drm/xe: Fix ref counting leak on page fault

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If a page fault occurs on VM not in fault a ref can be leaked. Fix this.

Fixes: dd08ebf6c3 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240301041036.238471-1-matthew.brost@intel.com
(cherry picked from commit 27b5a3f237)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
This commit is contained in:
Matthew Brost
2024-02-29 20:10:36 -08:00
committed by Lucas De Marchi
parent c6f6750bd2
commit f7da398935
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/xe/xe_gt_pagefault.c
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@@ -146,10 +146,12 @@ static int handle_pagefault(struct xe_gt *gt, struct pagefault *pf)
/* ASID to VM */
mutex_lock(&xe->usm.lock);
vm = xa_load(&xe->usm.asid_to_vm, pf->asid);
if (vm)
if (vm && xe_vm_in_fault_mode(vm))
xe_vm_get(vm);
else
vm = NULL;
mutex_unlock(&xe->usm.lock);
if (!vm || !xe_vm_in_fault_mode(vm))
if (!vm)
return -EINVAL;
retry_userptr: