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Date: Thu, 28 Nov 2019 13:24:44 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: "Y.b. Lu" <yangbo.lu@....com>
Cc: "davem@...emloft.net" <davem@...emloft.net>,
"richardcochran@...il.com" <richardcochran@...il.com>,
"andrew@...n.ch" <andrew@...n.ch>,
"f.fainelli@...il.com" <f.fainelli@...il.com>,
"vivien.didelot@...il.com" <vivien.didelot@...il.com>,
Claudiu Manoil <claudiu.manoil@....com>,
Alexandru Marginean <alexandru.marginean@....com>,
Xiaoliang Yang <xiaoliang.yang_1@....com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
"UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net] net: mscc: ocelot: unregister the PTP clock on deinit
On Thu, 28 Nov 2019 at 04:42, Y.b. Lu <yangbo.lu@....com> wrote:
>
> > -----Original Message-----
> > From: Vladimir Oltean <olteanv@...il.com>
> > Sent: Thursday, November 28, 2019 9:57 AM
> > To: davem@...emloft.net; richardcochran@...il.com
> > Cc: andrew@...n.ch; f.fainelli@...il.com; vivien.didelot@...il.com;
> > Claudiu Manoil <claudiu.manoil@....com>; Alexandru Marginean
> > <alexandru.marginean@....com>; Xiaoliang Yang
> > <xiaoliang.yang_1@....com>; Y.b. Lu <yangbo.lu@....com>;
> > netdev@...r.kernel.org; alexandre.belloni@...tlin.com;
> > UNGLinuxDriver@...rochip.com; Vladimir Oltean <vladimir.oltean@....com>
> > Subject: [PATCH net] net: mscc: ocelot: unregister the PTP clock on deinit
> >
> > From: Vladimir Oltean <vladimir.oltean@....com>
> >
> > Currently a switch driver deinit frees the regmaps, but the PTP clock is still out
> > there, available to user space via /dev/ptpN. Any PTP operation is a ticking
> > time bomb, since it will attempt to use the freed regmaps and thus trigger
> > kernel panics:
> >
> > [ 4.291746] fsl_enetc 0000:00:00.2 eth1: error -22 setting up slave phy
> > [ 4.291871] mscc_felix 0000:00:00.5: Failed to register DSA switch: -22
> > [ 4.308666] mscc_felix: probe of 0000:00:00.5 failed with error -22
> > [ 6.358270] Unable to handle kernel NULL pointer dereference at virtual
> > address 0000000000000088
> > [ 6.367090] Mem abort info:
> > [ 6.369888] ESR = 0x96000046
> > [ 6.369891] EC = 0x25: DABT (current EL), IL = 32 bits
> > [ 6.369892] SET = 0, FnV = 0
> > [ 6.369894] EA = 0, S1PTW = 0
> > [ 6.369895] Data abort info:
> > [ 6.369897] ISV = 0, ISS = 0x00000046
> > [ 6.369899] CM = 0, WnR = 1
> > [ 6.369902] user pgtable: 4k pages, 48-bit VAs, pgdp=00000020d58c7000
> > [ 6.369904] [0000000000000088] pgd=00000020d5912003,
> > pud=00000020d5915003, pmd=0000000000000000
> > [ 6.369914] Internal error: Oops: 96000046 [#1] PREEMPT SMP
> > [ 6.420443] Modules linked in:
> > [ 6.423506] CPU: 1 PID: 262 Comm: phc_ctl Not tainted
> > 5.4.0-03625-gb7b2a5dadd7f #204
> > [ 6.431273] Hardware name: LS1028A RDB Board (DT)
> > [ 6.435989] pstate: 40000085 (nZcv daIf -PAN -UAO)
> > [ 6.440802] pc : css_release+0x24/0x58
> > [ 6.444561] lr : regmap_read+0x40/0x78
> > [ 6.448316] sp : ffff800010513cc0
> > [ 6.451636] x29: ffff800010513cc0 x28: ffff002055873040
> > [ 6.456963] x27: 0000000000000000 x26: 0000000000000000
> > [ 6.462289] x25: 0000000000000000 x24: 0000000000000000
> > [ 6.467617] x23: 0000000000000000 x22: 0000000000000080
> > [ 6.472944] x21: ffff800010513d44 x20: 0000000000000080
> > [ 6.478270] x19: 0000000000000000 x18: 0000000000000000
> > [ 6.483596] x17: 0000000000000000 x16: 0000000000000000
> > [ 6.488921] x15: 0000000000000000 x14: 0000000000000000
> > [ 6.494247] x13: 0000000000000000 x12: 0000000000000000
> > [ 6.499573] x11: 0000000000000000 x10: 0000000000000000
> > [ 6.504899] x9 : 0000000000000000 x8 : 0000000000000000
> > [ 6.510225] x7 : 0000000000000000 x6 : ffff800010513cf0
> > [ 6.515550] x5 : 0000000000000000 x4 : 0000000fffffffe0
> > [ 6.520876] x3 : 0000000000000088 x2 : ffff800010513d44
> > [ 6.526202] x1 : ffffcada668ea000 x0 : ffffcada64d8b0c0
> > [ 6.531528] Call trace:
> > [ 6.533977] css_release+0x24/0x58
> > [ 6.537385] regmap_read+0x40/0x78
> > [ 6.540795] __ocelot_read_ix+0x6c/0xa0
> > [ 6.544641] ocelot_ptp_gettime64+0x4c/0x110
> > [ 6.548921] ptp_clock_gettime+0x4c/0x58
> > [ 6.552853] pc_clock_gettime+0x5c/0xa8
> > [ 6.556699] __arm64_sys_clock_gettime+0x68/0xc8
> > [ 6.561331] el0_svc_common.constprop.2+0x7c/0x178
> > [ 6.566133] el0_svc_handler+0x34/0xa0
> > [ 6.569891] el0_sync_handler+0x114/0x1d0
> > [ 6.573908] el0_sync+0x140/0x180
> > [ 6.577232] Code: d503201f b00119a1 91022263 b27b7be4 (f9004663)
> > [ 6.583349] ---[ end trace d196b9b14cdae2da ]---
> > [ 6.587977] Kernel panic - not syncing: Fatal exception
> > [ 6.593216] SMP: stopping secondary CPUs
> > [ 6.597151] Kernel Offset: 0x4ada54400000 from 0xffff800010000000
> > [ 6.603261] PHYS_OFFSET: 0xffffd0a7c0000000
> > [ 6.607454] CPU features: 0x10002,21806008
> > [ 6.611558] Memory Limit: none
> > [ 6.614620] Rebooting in 3 seconds..
> >
> > Fixes: 4e3b0468e6d7 ("net: mscc: PTP Hardware Clock (PHC) support")
> > Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> > ---
> > drivers/net/ethernet/mscc/ocelot.c | 9 +++++++++
> > 1 file changed, 9 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/mscc/ocelot.c
> > b/drivers/net/ethernet/mscc/ocelot.c
> > index 52a1b1f12af8..245298d9ba8c 100644
> > --- a/drivers/net/ethernet/mscc/ocelot.c
> > +++ b/drivers/net/ethernet/mscc/ocelot.c
> > @@ -2166,6 +2166,14 @@ static struct ptp_clock_info ocelot_ptp_clock_info
> > = {
> > .adjfine = ocelot_ptp_adjfine,
> > };
> >
> > +static void ocelot_deinit_timestamp(struct ocelot *ocelot) {
> > + if (!ocelot->ptp || !ocelot->ptp_clock)
> > + return;
> > +
> > + ptp_clock_unregister(ocelot->ptp_clock);
>
> [Y.b. Lu] It makes sense. How about,
>
> If (ocelot->ptp_clock)
> ptp_clock_unregister(ocelot->ptp_clock);
>
Ok, sent a v2 with this change. I needed to do one more check in
ocelot_init_timestamp anyway.
> > +}
> > +
> > static int ocelot_init_timestamp(struct ocelot *ocelot) {
> > ocelot->ptp_info = ocelot_ptp_clock_info; @@ -2508,6 +2516,7 @@ void
> > ocelot_deinit(struct ocelot *ocelot)
> > destroy_workqueue(ocelot->stats_queue);
> > mutex_destroy(&ocelot->stats_lock);
> > ocelot_ace_deinit();
> > + ocelot_deinit_timestamp(ocelot);
> >
> > for (i = 0; i < ocelot->num_phys_ports; i++) {
> > port = ocelot->ports[i];
> > --
> > 2.17.1
>
Thanks,
-Vladimir
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