linux-kernel - RE: [PATCH] usb: renesas_usbhs: fix error return code of usbhsf_pkt

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Date:   Tue, 9 Mar 2021 11:59:39 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: RE: [PATCH] usb: renesas_usbhs: fix error return code of
 usbhsf_pkt_handler()

Hi Jia-Ju,

Thank you for the patch!

> From: Jia-Ju Bai, Sent: Sunday, March 7, 2021 6:01 PM
> 
> When __usbhsf_pkt_get() returns NULL to pkt, no error return code of
> usbhsf_pkt_handler() is assigned.

Yes. Also I realized that no error return code of usbhsf_pkt_handler()
was assigned if the type value was unexpected value. So, I'm thinking
initial value of ret should be -EINVAL instead of 0.
---
        int ret = 0;  // should be -EINVAL
        int is_done = 0;

        /********************  spin lock ********************/
        usbhs_lock(priv, flags);

        pkt = __usbhsf_pkt_get(pipe);
        if (!pkt)
                goto __usbhs_pkt_handler_end;

        switch (type) {
        case USBHSF_PKT_PREPARE:
                func = pkt->handler->prepare;
                break;
        case USBHSF_PKT_TRY_RUN:
                func = pkt->handler->try_run;
                break;
        case USBHSF_PKT_DMA_DONE:
                func = pkt->handler->dma_done;
                break;
        default:
                dev_err(dev, "unknown pkt handler\n");
                goto __usbhs_pkt_handler_end;    /// here
        }

        if (likely(func))  /// [1]
                ret = func(pkt, &is_done);

[1] This is always true here, so ret is always assigned by the func().
---

> To fix this bug, ret is assigned with -EINVAL in this case.

Just a record: After fixed this, actual behavior is almost the same
except printing error message.

Best regards,
Yoshihiro Shimoda