Re: [Patch] Signedness issue in drivers/net/3c515.c

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sat, 19 Aug 2006 19:37:57 +0200
Eric Sesterhenn <[email protected]> wrote:

> while playing with gcc 4.1 -Wextra warnings, I came across this one:
> 
> drivers/net/3c515.c:1027: warning: comparison of unsigned expression >= 0 is always true
> 
> Since i is unsigned the >= 0 check in the for loop is always true,
> so we might spin there forever unless the if condition triggers.
> Since i is only used in this loop, this patch changes it to
> an integer.
> 
> Signed-off-by: Eric Sesterhenn <[email protected]>
> 
> --- linux-2.6.18-rc4/drivers/net/3c515.c.orig	2006-08-19 19:35:04.000000000 +0200
> +++ linux-2.6.18-rc4/drivers/net/3c515.c	2006-08-19 19:35:14.000000000 +0200
> @@ -1003,7 +1003,8 @@ static int corkscrew_start_xmit(struct s
>  		/* Calculate the next Tx descriptor entry. */
>  		int entry = vp->cur_tx % TX_RING_SIZE;
>  		struct boom_tx_desc *prev_entry;
> -		unsigned long flags, i;
> +		unsigned long flags;
> +		int i;
>  
>  		if (vp->tx_full)	/* No room to transmit with */
>  			return 1;

Which affects this loop:

	/* Wait for the stall to complete. */
	for (i = 20; i >= 0; i--)
		if ((inw(ioaddr + EL3_STATUS) & CmdInProgress) == 0) 
			break;

Your fix will convert this indefinit wait into a bounded one.  It might
cause the driver to malfunction.

Given that our pool of 3c515 testers is less than enormous, a more prudent
change might be to remove `i' and simply formalise the existing behaviour
into a while(1) loop.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux