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From:   Ping-Ke Shih <pkshih@realtek.com>
To:     Dan Carpenter <dan.carpenter@linaro.org>,
        "s.hauer@pengutronix.de" <s.hauer@pengutronix.de>
CC:     "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: RE: [bug report] wifi: rtw88: usb: fix priority queue to endpoint mapping
Thread-Topic: [bug report] wifi: rtw88: usb: fix priority queue to endpoint
 mapping
Thread-Index: AQHZfnckew+PUCPgkEGu0NoEQg74H69PrtFA
Date:   Mon, 8 May 2023 02:39:19 +0000
Message-ID: <ab52f337fdf842499912458efab7704c@realtek.com>
References: <c3f70197-829d-48ed-ae15-66a9de80fa90@kili.mountain>
In-Reply-To: <c3f70197-829d-48ed-ae15-66a9de80fa90@kili.mountain>
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Hi Sascha,

> -----Original Message-----
> From: Dan Carpenter <dan.carpenter@linaro.org>
> Sent: Thursday, May 4, 2023 6:56 PM
> To: s.hauer@pengutronix.de
> Cc: linux-wireless@vger.kernel.org
> Subject: [bug report] wifi: rtw88: usb: fix priority queue to endpoint mapping
> 
> Hello Sascha Hauer,
> 
> The patch a6f187f92bcc: "wifi: rtw88: usb: fix priority queue to
> endpoint mapping" from Apr 17, 2023, leads to the following Smatch
> static checker warning:
> 
> drivers/net/wireless/realtek/rtw88/usb.c:219 rtw_usb_parse() warn: assigning (-22) to unsigned variable
> 'rtwusb->qsel_to_ep[8]'

[...]

>     218         rtwusb->qsel_to_ep[TX_DESC_QSEL_TID7] = dma_mapping_to_ep(rqpn->dma_map_vo);
> --> 219         rtwusb->qsel_to_ep[TX_DESC_QSEL_TID8] = -EINVAL;
> 
> Can't save negative error codes to a u8.
> 

return type of dma_mapping_to_ep() is 'int' and it also possibly returns -EINVAL, and
rtwusb->qsel_to_ep[] is used by qsel_to_ep() that also use 'int' as return type. 
Therefore, I would like to change type of qsel_to_ep[] from 'u8' to 'int'. Does it
work to you?

Ping-Ke