linux-kernel - Re: [PATCH v1 1/1] i3c: master: svc: Fix i3c_master_get_free_addr return check

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Message-ID: <Z874dh9lV7P+GpkM@lizhi-Precision-Tower-5810>
Date: Mon, 10 Mar 2025 10:34:30 -0400
From: Frank Li <Frank.li@....com>
To: Stanley Chu <stanley.chuys@...il.com>
Cc: miquel.raynal@...tlin.com, alexandre.belloni@...tlin.com,
	linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
	tomer.maimon@...oton.com, kwliu@...oton.com, yschu@...oton.com,
	Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH v1 1/1] i3c: master: svc: Fix i3c_master_get_free_addr
 return check

On Mon, Mar 10, 2025 at 10:33:04AM +0800, Stanley Chu wrote:
> From: Stanley Chu <yschu@...oton.com>
>
> The return value of i3c_master_get_free_addr is assigned to a variable
> with wrong type, so it can't be negative. Use a signed integer for the
> return value. If the value is negative, break the process and propagate
> the error code.
>
> This commit also fixes the uninitialized symbol 'dyn_addr', reported
> by Smatch static checker.
>
> Fixes: 4008a74e0f9b ("i3c: master: svc: Fix npcm845 FIFO empty issue")
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/all/029e5ac0-5444-4a8e-bca4-cec55950d2b9@stanley.mountain/
> Signed-off-by: Stanley Chu <yschu@...oton.com>
> ---

Reviewed-by: Frank Li <Frank.Li@....com>

>  drivers/i3c/master/svc-i3c-master.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index f22fb9e75142..1d1f351b9a85 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -940,7 +940,7 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
>  					u8 *addrs, unsigned int *count)
>  {
>  	u64 prov_id[SVC_I3C_MAX_DEVS] = {}, nacking_prov_id = 0;
> -	unsigned int dev_nb = 0, last_addr = 0, dyn_addr;
> +	unsigned int dev_nb = 0, last_addr = 0, dyn_addr = 0;
>  	u32 reg;
>  	int ret, i;
>
> @@ -998,10 +998,11 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
>  			 * filling within a few hundred nanoseconds, which is significantly
>  			 * faster compared to the 64 SCL clock cycles.
>  			 */
> -			dyn_addr = i3c_master_get_free_addr(&master->base, last_addr + 1);
> -			if (dyn_addr < 0)
> -				return -ENOSPC;
> +			ret = i3c_master_get_free_addr(&master->base, last_addr + 1);
> +			if (ret < 0)
> +				break;
>
> +			dyn_addr = ret;
>  			writel(dyn_addr, master->regs + SVC_I3C_MWDATAB);
>
>  			/*
> --
> 2.34.1
>
>
> --
> linux-i3c mailing list
> linux-i3c@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-i3c

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