[PATCH AUTOSEL 5.4 19/25] nvme-tcp: fix memory leak when freeing a queue

[Sasha Levin]

From: Maurizio Lombardi <mlombard at redhat.com>

[ Upstream commit a5053c92b3db71c3f7f9f13934ca620632828d06 ]

Release the page frag cache when tearing down the io queues

Signed-off-by: Maurizio Lombardi <mlombard at redhat.com>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Reviewed-by: John Meneghini <jmeneghi at redhat.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 drivers/nvme/host/tcp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index ff0d06e8ebb53..a1c870e686549 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1134,6 +1134,7 @@ static int nvme_tcp_alloc_async_req(struct nvme_tcp_ctrl *ctrl)
 
 static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid)
 {
+	struct page *page;
 	struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
 	struct nvme_tcp_queue *queue = &ctrl->queues[qid];
 
@@ -1143,6 +1144,11 @@ static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid)
 	if (queue->hdr_digest || queue->data_digest)
 		nvme_tcp_free_crypto(queue);
 
+	if (queue->pf_cache.va) {
+		page = virt_to_head_page(queue->pf_cache.va);
+		__page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias);
+		queue->pf_cache.va = NULL;
+	}
 	sock_release(queue->sock);
 	kfree(queue->pdu);
 }
-- 
2.33.0