linux-kernel - [PATCH net v2 1/2] net: ipa: fix page free in ipa_endpoint_trans

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Message-Id: <20220526152314.1405629-2-elder@linaro.org>
Date:   Thu, 26 May 2022 10:23:13 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     mka@...omium.org, evgreen@...omium.org, bjorn.andersson@...aro.org,
        quic_cpratapa@...cinc.com, quic_avuyyuru@...cinc.com,
        quic_jponduru@...cinc.com, quic_subashab@...cinc.com,
        elder@...nel.org, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net v2 1/2] net: ipa: fix page free in ipa_endpoint_trans_release()

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>
---
 drivers/net/ipa/ipa_endpoint.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 385aa63ab4bbc..e92aa9447f6e7 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1418,11 +1418,8 @@ void ipa_endpoint_trans_release(struct ipa_endpoint *endpoint,
 	} else {
 		struct page *page = trans->data;
 
-		if (page) {
-			u32 buffer_size = endpoint->config.rx.buffer_size;
-
-			__free_pages(page, get_order(buffer_size));
-		}
+		if (page)
+			put_page(page);
 	}
 }
 
-- 
2.32.0