linux-kernel - [PATCH][next][V2] staging: r8188eu: Fix while-loop that iterates only once

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Date:   Wed, 30 Jun 2021 07:56:47 +0100
From:   Colin King <colin.king@...onical.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        David Laight <David.Laight@...LAB.COM>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next][V2] staging: r8188eu: Fix while-loop that iterates only once

From: Colin Ian King <colin.king@...onical.com>

The while-loop only iterates once becase the post increment test of count
being non-zero is false on the first iteration because count is zero. Fix
this by using a for-loop instead. Static analysis found the issue on the
count > POLLING_LLT_THRESHOLD check always being false since the loop
currently just iterates once.

Thanks to David Laight for suggesting using for-loop instead to improve
the readability of the fix.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
V2: use for-loop instead of change count increment to pre-increment.
---
 drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c b/drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c
index d1086699f952..1c6365832247 100644
--- a/drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c
+++ b/drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c
@@ -168,14 +168,14 @@ void rtw_hal_notch_filter(struct adapter *adapter, bool enable)
 static s32 _LLTWrite(struct adapter *padapter, u32 address, u32 data)
 {
 	s32	status = _SUCCESS;
-	s32	count = 0;
+	s32	count;
 	u32	value = _LLT_INIT_ADDR(address) | _LLT_INIT_DATA(data) | _LLT_OP(_LLT_WRITE_ACCESS);
 	u16	LLTReg = REG_LLT_INIT;
 
 	usb_write32(padapter, LLTReg, value);
 
 	/* polling */
-	do {
+	for (count = 0; ; count++) {
 		value = usb_read32(padapter, LLTReg);
 		if (_LLT_OP_VALUE(value) == _LLT_NO_ACTIVE)
 			break;
@@ -185,7 +185,7 @@ static s32 _LLTWrite(struct adapter *padapter, u32 address, u32 data)
 			break;
 		}
 		udelay(5);
-	} while (count++);
+	}
 
 	return status;
 }
-- 
2.31.1