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From: David Laight <David.Laight@ACULAB.COM>
To: 'Colin King' <colin.king@canonical.com>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-staging@lists.linux.dev" <linux-staging@lists.linux.dev>
Cc: "kernel-janitors@vger.kernel.org"
	<kernel-janitors@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] staging: r8188eu: Fix while-loop that iterates only once
Date: Tue, 29 Jun 2021 21:53:20 +0000	[thread overview]
Message-ID: <ff4444d1d2204539945ded9bf06c94e6@AcuMS.aculab.com> (raw)
In-Reply-To: <20210629163624.41543-1-colin.king@canonical.com>

From: Colin King
> Sent: 29 June 2021 17:36
> 
> 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 incrementing count using pre-increment. Static analysis found the
> issue on the count > POLLING_LLT_THRESHOLD check always being false since
> the loop currently just iterates once.

But that is a very strange 'loop bottom'.

...
> diff --git a/drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c
> b/drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c
> index d1086699f952..db57f04e7e56 100644
> --- a/drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c
> +++ b/drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c
> @@ -185,7 +185,7 @@ static s32 _LLTWrite(struct adapter *padapter, u32 address, u32 data)
>  			break;
>  		}
>  		udelay(5);
> -	} while (count++);
> +	} while (++count);

Unless 'count' is negative that might as well be 'while (1)'
with count incremented elsewhere.
Perhaps the loop top should be:
	for (count = 0;; count++) {

   David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

  reply	other threads:[~2021-06-29 21:53 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-29 16:36 Colin King
2021-06-29 21:53 ` David Laight [this message]
2021-06-30  6:44   ` Colin Ian King

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