netdev - [PATCH v4] rtw88: Remove unnecessary check code

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Message-Id: <20210731163546.10753-1-len.baker@gmx.com>
Date:   Sat, 31 Jul 2021 18:35:46 +0200
From:   Len Baker <len.baker@....com>
To:     Yan-Hsuan Chuang <tony0620emma@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Len Baker <len.baker@....com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Brian Norris <briannorris@...omium.org>,
        Pkshih <pkshih@...ltek.com>, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4] rtw88: Remove unnecessary check code

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.

The true motivation for this patch is to silence a false Coverity
warning.

Reviewed-by: Brian Norris <briannorris@...omium.org>
Signed-off-by: Len Baker <len.baker@....com>
---
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.

Changelog v3 -> v4
- Add the "Reviewed-by: Brian Norris" tag.
- Update the commit changelog to include the true motivation for the
  patch (Brian Norris).

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/

v3
https://lore.kernel.org/lkml/20210718084202.5118-1-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/wireless/realtek/rtw88/pci.c
index e7d17ab8f113..f17e7146f20f 100644
--- 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 *rtwdev,
 	int i, allocated;
 	int ret = 0;

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