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    Subject[PATCH 4.4 043/190] usb: chipidea: properly handle host or gadget initialization failure
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jisheng Zhang <jszhang@marvell.com>


    [ Upstream commit c4a0bbbdb7f6e3c37fa6deb3ef28c5ed99da6175 ]

    If ci_hdrc_host_init() or ci_hdrc_gadget_init() returns error and the
    error != -ENXIO, as Peter pointed out, "it stands for initialization
    for host or gadget has failed", so we'd better return failure rather
    continue.

    And before destroying the otg, i.e ci_hdrc_otg_destroy(ci), we should
    also check ci->roles[CI_ROLE_GADGET].

    Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
    Signed-off-by: Peter Chen <peter.chen@nxp.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/usb/chipidea/core.c | 29 +++++++++++++++++++++--------
    1 file changed, 21 insertions(+), 8 deletions(-)

    --- a/drivers/usb/chipidea/core.c
    +++ b/drivers/usb/chipidea/core.c
    @@ -851,7 +851,7 @@ static inline void ci_role_destroy(struc
    {
    ci_hdrc_gadget_destroy(ci);
    ci_hdrc_host_destroy(ci);
    - if (ci->is_otg)
    + if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
    ci_hdrc_otg_destroy(ci);
    }

    @@ -951,27 +951,35 @@ static int ci_hdrc_probe(struct platform
    /* initialize role(s) before the interrupt is requested */
    if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
    ret = ci_hdrc_host_init(ci);
    - if (ret)
    - dev_info(dev, "doesn't support host\n");
    + if (ret) {
    + if (ret == -ENXIO)
    + dev_info(dev, "doesn't support host\n");
    + else
    + goto deinit_phy;
    + }
    }

    if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
    ret = ci_hdrc_gadget_init(ci);
    - if (ret)
    - dev_info(dev, "doesn't support gadget\n");
    + if (ret) {
    + if (ret == -ENXIO)
    + dev_info(dev, "doesn't support gadget\n");
    + else
    + goto deinit_host;
    + }
    }

    if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
    dev_err(dev, "no supported roles\n");
    ret = -ENODEV;
    - goto deinit_phy;
    + goto deinit_gadget;
    }

    if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
    ret = ci_hdrc_otg_init(ci);
    if (ret) {
    dev_err(dev, "init otg fails, ret = %d\n", ret);
    - goto stop;
    + goto deinit_gadget;
    }
    }

    @@ -1036,7 +1044,12 @@ static int ci_hdrc_probe(struct platform

    ci_extcon_unregister(ci);
    stop:
    - ci_role_destroy(ci);
    + if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
    + ci_hdrc_otg_destroy(ci);
    +deinit_gadget:
    + ci_hdrc_gadget_destroy(ci);
    +deinit_host:
    + ci_hdrc_host_destroy(ci);
    deinit_phy:
    ci_usb_phy_exit(ci);


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