From: Guenter Roeck <linux@roeck-us.net>
To: Doug Anderson <dianders@chromium.org>
Cc: Kalle Valo <kvalo@codeaurora.org>,
Arend van Spriel <arend.vanspriel@broadcom.com>,
Franky Lin <franky.lin@broadcom.com>,
Hante Meuleman <hante.meuleman@broadcom.com>,
Chi-Hsien Lin <chi-hsien.lin@cypress.com>,
Dan Carpenter <dan.carpenter@oracle.com>,
linux-wireless <linux-wireless@vger.kernel.org>,
brcm80211-dev-list.pdl@broadcom.com,
brcm80211-dev-list <brcm80211-dev-list@cypress.com>,
netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Matthias Kaehlcke <mka@chromium.org>,
Brian Norris <briannorris@chromium.org>
Subject: Re: [PATCH] brcmfmac: abort and release host after error
Date: Tue, 28 Jan 2020 16:05:51 -0800 [thread overview]
Message-ID: <20200129000551.GA17256@roeck-us.net> (raw)
In-Reply-To: <CAD=FV=Wg2MZ56fsCk+TvRSSeZVz5eM4cwugK=HN6imm5wfGgiw@mail.gmail.com>
On Tue, Jan 28, 2020 at 03:14:45PM -0800, Doug Anderson wrote:
> Hi,
>
> On Tue, Jan 28, 2020 at 2:15 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >
> > With commit 216b44000ada ("brcmfmac: Fix use after free in
> > brcmf_sdio_readframes()") applied, we see locking timeouts in
> > brcmf_sdio_watchdog_thread().
> >
> > brcmfmac: brcmf_escan_timeout: timer expired
> > INFO: task brcmf_wdog/mmc1:621 blocked for more than 120 seconds.
> > Not tainted 4.19.94-07984-g24ff99a0f713 #1
> > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > brcmf_wdog/mmc1 D 0 621 2 0x00000000 last_sleep: 2440793077. last_runnable: 2440766827
> > [<c0aa1e60>] (__schedule) from [<c0aa2100>] (schedule+0x98/0xc4)
> > [<c0aa2100>] (schedule) from [<c0853830>] (__mmc_claim_host+0x154/0x274)
> > [<c0853830>] (__mmc_claim_host) from [<bf10c5b8>] (brcmf_sdio_watchdog_thread+0x1b0/0x1f8 [brcmfmac])
> > [<bf10c5b8>] (brcmf_sdio_watchdog_thread [brcmfmac]) from [<c02570b8>] (kthread+0x178/0x180)
> >
> > In addition to restarting or exiting the loop, it is also necessary to
> > abort the command and to release the host.
> >
> > Fixes: 216b44000ada ("brcmfmac: Fix use after free in brcmf_sdio_readframes()")
> > Cc: Dan Carpenter <dan.carpenter@oracle.com>
> > Cc: Matthias Kaehlcke <mka@chromium.org>
> > Cc: Brian Norris <briannorris@chromium.org>
> > Cc: Douglas Anderson <dianders@chromium.org>
> > Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> > ---
> > drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> > index f9df95bc7fa1..2e1c23c7269d 100644
> > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> > @@ -1938,6 +1938,8 @@ static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)
> > if (brcmf_sdio_hdparse(bus, bus->rxhdr, &rd_new,
> > BRCMF_SDIO_FT_NORMAL)) {
> > rd->len = 0;
> > + brcmf_sdio_rxfail(bus, true, true);
> > + sdio_release_host(bus->sdiodev->func1);
>
> I don't know much about this driver so I don't personally know if
> "true, true" is the correct thing to pass to brcmf_sdio_rxfail(), but
> it seems plausible. Definitely the fix to call sdio_release_host() is
> sane.
>
> Thus, unless someone knows for sure that brcmf_sdio_rxfail()'s
> parameters should be different:
>
Actually, looking at brcmf_sdio_hdparse() and its other callers,
I think it may not be needed at all - other callers don't do it, and
there already are some calls to brcmf_sdio_rxfail() in that function.
It would be nice though to get a confirmation before I submit v2.
Guenter
next prev parent reply other threads:[~2020-01-29 0:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-28 22:14 [PATCH] brcmfmac: abort and release host after error Guenter Roeck
2020-01-28 23:14 ` Doug Anderson
2020-01-29 0:05 ` Guenter Roeck [this message]
2020-01-29 0:57 ` Franky Lin
2020-01-29 18:04 ` Brian Norris
2020-01-29 23:12 ` Franky Lin
2020-01-29 3:32 ` Dan Carpenter
2020-01-29 4:17 ` Guenter Roeck
2020-02-12 16:18 ` Kalle Valo
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