linux-kernel - [PATCH 5.18 861/879] net: ipa: fix page free in ipa_endpoint_trans

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Message-Id: <20220607165027.847750783@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 19:06:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alex Elder <elder@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.18 861/879] net: ipa: fix page free in ipa_endpoint_trans_release()

From: Alex Elder <elder@...aro.org>

commit 155c0c90bca918de6e4327275dfc1d97fd604115 upstream.

Currently the (possibly compound) page used for receive buffers are
freed using __free_pages().  But according to this comment above the
definition of that function, that's wrong:
    If you want to use the page's reference count to decide when
    to free the allocation, you should allocate a compound page,
    and use put_page() instead of __free_pages().

Convert the call to __free_pages() in ipa_endpoint_trans_release()
to use put_page() instead.

Fixes: ed23f02680caa ("net: ipa: define per-endpoint receive buffer size")
Signed-off-by: Alex Elder <elder@...aro.org>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ipa/ipa_endpoint.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1385,11 +1385,8 @@ void ipa_endpoint_trans_release(struct i
 	} else {
 		struct page *page = trans->data;
 
-		if (page) {
-			u32 buffer_size = endpoint->data->rx.buffer_size;
-
-			__free_pages(page, get_order(buffer_size));
-		}
+		if (page)
+			put_page(page);
 	}
 }