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From:   Len Baker <len.baker@gmx.com>
To:     Yan-Hsuan Chuang <tony0620emma@gmail.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     Len Baker <len.baker@gmx.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        Brian Norris <briannorris@chromium.org>,
        Pkshih <pkshih@realtek.com>, linux-wireless@vger.kernel.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3] rtw88: Remove unnecessary check code
Date:   Sun, 18 Jul 2021 10:42:02 +0200
Message-Id: <20210718084202.5118-1-len.baker@gmx.com>
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

The rtw_pci_init_rx_ring function is only ever called with a fixed
constant or RTK_MAX_RX_DESC_NUM for the "len" argument. Since this
constant is defined as 512, the "if (len > TRX_BD_IDX_MASK)" check
can never happen (TRX_BD_IDX_MASK is defined as GENMASK(11, 0) or in
other words as 4095).

So, remove this check.

Signed-off-by: Len Baker <len.baker@gmx.com>
=2D--
Changelog v1 -> v2
- Remove the macro ARRAY_SIZE from the for loop (Pkshih, Brian Norris).
- Add a new check for the len variable (Pkshih, Brian Norris).

Changelog v2 -> v3
- Change the subject of the patch.
- Remove the "if" check statement (Greg KH)
- Remove the "Fixes" tag, "Addresses-Coverity-ID" tag and Cc to stable.

The previous versions can be found at:

v1
https://lore.kernel.org/lkml/20210711141634.6133-1-len.baker@gmx.com/

v2
https://lore.kernel.org/lkml/20210716155311.5570-1-len.baker@gmx.com/

 drivers/net/wireless/realtek/rtw88/pci.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wirele=
ss/realtek/rtw88/pci.c
index e7d17ab8f113..f17e7146f20f 100644
=2D-- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -268,11 +268,6 @@ static int rtw_pci_init_rx_ring(struct rtw_dev *rtwde=
v,
 	int i, allocated;
 	int ret =3D 0;

-	if (len > TRX_BD_IDX_MASK) {
-		rtw_err(rtwdev, "len %d exceeds maximum RX entries\n", len);
-		return -EINVAL;
-	}
-
 	head =3D dma_alloc_coherent(&pdev->dev, ring_sz, &dma, GFP_KERNEL);
 	if (!head) {
 		rtw_err(rtwdev, "failed to allocate rx ring\n");
=2D-
2.25.1