Patch "drm/xe: Fix memory leak on xe_alloc_pf_queue failure" has been added to the 6.11-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/xe: Fix memory leak on xe_alloc_pf_queue failure

to the 6.11-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-xe-fix-memory-leak-on-xe_alloc_pf_queue-failure.patch
and it can be found in the queue-6.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e75d6762d8eedf106870812ec21a18bebcfa5da2
Author: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Date:   Mon Aug 26 18:20:35 2024 +0200

    drm/xe: Fix memory leak on xe_alloc_pf_queue failure
    
    [ Upstream commit c5f728de696caa35481fd84202dfbc9fecc18e0b ]
    
    Simplify memory unwinding on error also fixing current memory
    leak that can happen on error.
    
    v2: use devm_kcalloc(Matt A)
    
    Fixes: 3338e4f90c14 ("drm/xe: Use topology to determine page fault queue size")
    Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
    Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
    Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
    Cc: Stuart Summers <stuart.summers@xxxxxxxxx>
    Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20240826162035.20462-1-nirmoy.das@xxxxxxxxx
    Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/xe/xe_gt_pagefault.c b/drivers/gpu/drm/xe/xe_gt_pagefault.c
index 0be4687bfc203..730eec07795e2 100644
--- a/drivers/gpu/drm/xe/xe_gt_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_gt_pagefault.c
@@ -388,20 +388,17 @@ static void pagefault_fini(void *arg)
 {
 	struct xe_gt *gt = arg;
 	struct xe_device *xe = gt_to_xe(gt);
-	int i;
 
 	if (!xe->info.has_usm)
 		return;
 
 	destroy_workqueue(gt->usm.acc_wq);
 	destroy_workqueue(gt->usm.pf_wq);
-
-	for (i = 0; i < NUM_PF_QUEUE; ++i)
-		kfree(gt->usm.pf_queue[i].data);
 }
 
 static int xe_alloc_pf_queue(struct xe_gt *gt, struct pf_queue *pf_queue)
 {
+	struct xe_device *xe = gt_to_xe(gt);
 	xe_dss_mask_t all_dss;
 	int num_dss, num_eus;
 
@@ -417,7 +414,8 @@ static int xe_alloc_pf_queue(struct xe_gt *gt, struct pf_queue *pf_queue)
 		(num_eus + XE_NUM_HW_ENGINES) * PF_MSG_LEN_DW;
 
 	pf_queue->gt = gt;
-	pf_queue->data = kcalloc(pf_queue->num_dw, sizeof(u32), GFP_KERNEL);
+	pf_queue->data = devm_kcalloc(xe->drm.dev, pf_queue->num_dw,
+				      sizeof(u32), GFP_KERNEL);
 	if (!pf_queue->data)
 		return -ENOMEM;