FAILED: patch "[PATCH] octeontx2-pf: Avoid use of GFP_KERNEL in atomic context" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Possible dependencies:

87b93b678e95 ("octeontx2-pf: Avoid use of GFP_KERNEL in atomic context") 4af1b64f80fb ("octeontx2-pf: Fix lmtst ID used in aura free")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 87b93b678e95c7d93fe6a55b0e0fbda26d8c7760 Mon Sep 17 00:00:00 2001
From: Geetha sowjanya <[email protected]>
Date: Fri, 13 Jan 2023 11:49:02 +0530
Subject: [PATCH] octeontx2-pf: Avoid use of GFP_KERNEL in atomic context

Using GFP_KERNEL in preemption disable context, causing below warning when CONFIG_DEBUG_ATOMIC_SLEEP is enabled.

[   32.542271] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274
[   32.550883] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper/0
[   32.558707] preempt_count: 1, expected: 0
[   32.562710] RCU nest depth: 0, expected: 0
[   32.566800] CPU: 3 PID: 1 Comm: swapper/0 Tainted: G        W          6.2.0-rc2-00269-gae9dcb91c606 #7
[   32.576188] Hardware name: Marvell CN106XX board (DT)
[   32.581232] Call trace:
[   32.583670]  dump_backtrace.part.0+0xe0/0xf0
[   32.587937]  show_stack+0x18/0x30
[   32.591245]  dump_stack_lvl+0x68/0x84
[   32.594900]  dump_stack+0x18/0x34
[   32.598206]  __might_resched+0x12c/0x160
[   32.602122]  __might_sleep+0x48/0xa0
[   32.605689]  __kmem_cache_alloc_node+0x2b8/0x2e0
[   32.610301]  __kmalloc+0x58/0x190
[   32.613610]  otx2_sq_aura_pool_init+0x1a8/0x314
[   32.618134]  otx2_open+0x1d4/0x9d0

To avoid use of GFP_ATOMIC for memory allocation, disable preemption after all memory allocation is done.

index 88f8772a61cd..497b777b6a34 100644
@@ -1370,7 +1370,6 @@ int otx2_sq_aura_pool_init(struct otx2_nic *pfvf)
 	if (err)
 		goto fail;
 
-	get_cpu();
 	/* Allocate pointers and free them to aura/pool */
 	for (qidx = 0; qidx < hw->tot_tx_queues; qidx++) {
 		pool_id = otx2_get_pool_idx(pfvf, AURA_NIX_SQ, qidx);

@@ -1388,13 +1387,14 @@ int otx2_sq_aura_pool_init(struct otx2_nic *pfvf)
 			err = otx2_alloc_rbuf(pfvf, pool, &bufptr);
 			if (err)
 				goto err_mem;
+			get_cpu();
 			pfvf->hw_ops->aura_freeptr(pfvf, pool_id, bufptr);
+			put_cpu();
 			sq->sqb_ptrs[sq->sqb_count++] = (u64)bufptr;
 		}
 	}
 
 err_mem:
-	put_cpu();
 	return err ? -ENOMEM : 0;
 
 fail: