linux-kernel - [PATCH] staging: r8188eu: fix rtw_alloc

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Date:   Sat, 21 May 2022 21:47:41 +0100
From:   Phillip Potter <phil@...lpotter.co.uk>
To:     gregkh@...uxfoundation.org
Cc:     Larry.Finger@...inger.net, straube.linux@...il.com,
        dan.carpenter@...cle.com, jiasheng@...as.ac.cn,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: r8188eu: fix rtw_alloc_hwxmits error detection for now

In _rtw_init_xmit_priv, we use the res variable to store the error
return from the newly converted rtw_alloc_hwxmits function. Sadly, the
calling function interprets res using _SUCCESS and _FAIL still, meaning
we change the semantics of the variable, even in the success case.

This leads to the following on boot:
r8188eu 1-2:1.0: _rtw_init_xmit_priv failed

In the long term, we should reverse these semantics, but for now, this
fixes the driver. Also, inside rtw_alloc_hwxmits remove the if blocks,
as HWXMIT_ENTRY is always 4.

Fixes: f94b47c6bde6 ("staging: r8188eu: add check for kzalloc")
Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>
---
 drivers/staging/r8188eu/core/rtw_xmit.c | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_xmit.c b/drivers/staging/r8188eu/core/rtw_xmit.c
index 3d8e9dea7651..7135d89caac1 100644
--- a/drivers/staging/r8188eu/core/rtw_xmit.c
+++ b/drivers/staging/r8188eu/core/rtw_xmit.c
@@ -178,8 +178,7 @@ s32	_rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 
 	pxmitpriv->free_xmit_extbuf_cnt = num_xmit_extbuf;
 
-	res = rtw_alloc_hwxmits(padapter);
-	if (res) {
+	if (rtw_alloc_hwxmits(padapter)) {
 		res = _FAIL;
 		goto exit;
 	}
@@ -1483,19 +1482,10 @@ int rtw_alloc_hwxmits(struct adapter *padapter)
 
 	hwxmits = pxmitpriv->hwxmits;
 
-	if (pxmitpriv->hwxmit_entry == 5) {
-		hwxmits[0] .sta_queue = &pxmitpriv->bm_pending;
-		hwxmits[1] .sta_queue = &pxmitpriv->vo_pending;
-		hwxmits[2] .sta_queue = &pxmitpriv->vi_pending;
-		hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
-		hwxmits[4] .sta_queue = &pxmitpriv->be_pending;
-	} else if (pxmitpriv->hwxmit_entry == 4) {
-		hwxmits[0] .sta_queue = &pxmitpriv->vo_pending;
-		hwxmits[1] .sta_queue = &pxmitpriv->vi_pending;
-		hwxmits[2] .sta_queue = &pxmitpriv->be_pending;
-		hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
-	} else {
-	}
+	hwxmits[0].sta_queue = &pxmitpriv->vo_pending;
+	hwxmits[1].sta_queue = &pxmitpriv->vi_pending;
+	hwxmits[2].sta_queue = &pxmitpriv->be_pending;
+	hwxmits[3].sta_queue = &pxmitpriv->bk_pending;
 
 	return 0;
 }
-- 
2.35.3