linux-kernel - [PATCH 5.18 862/879] net: ipa: fix page free in ipa_endpoint_replenish

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Message-Id: <20220607165027.876591870@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 19:06:20 +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 5.18 862/879] net: ipa: fix page free in ipa_endpoint_replenish_one()

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

commit 70132763d5d2e94cd185e3aa92ac6a3ba89068fa upstream.

Currently the (possibly compound) pages 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_replenish_one()
to use put_page() instead.

Fixes: 6a606b90153b8 ("net: ipa: allocate transaction in replenish loop")
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 |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1062,7 +1062,7 @@ static int ipa_endpoint_replenish_one(st
 
 	ret = gsi_trans_page_add(trans, page, len, offset);
 	if (ret)
-		__free_pages(page, get_order(buffer_size));
+		put_page(page);
 	else
 		trans->data = page;	/* transaction owns page now */