From db34a4714c013b644eec2de0ec81b1f0373b8b93 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Tue, 1 Oct 2019 22:07:01 +0300 Subject: ptp_qoriq: Initialize the registers' spinlock before calling ptp_qoriq_settime Because ptp_qoriq_settime is being called prior to spin_lock_init, the following stack trace can be seen at driver probe time: [ 2.269117] the code is fine but needs lockdep annotation. [ 2.274569] turning off the locking correctness validator. [ 2.280027] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.3.0-rc7-01478-g01eaa67a4797 #263 [ 2.288073] Hardware name: Freescale LS1021A [ 2.292337] [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [ 2.300045] [] (show_stack) from [] (dump_stack+0xcc/0xf8) [ 2.307235] [] (dump_stack) from [] (register_lock_class+0x730/0x73c) [ 2.315372] [] (register_lock_class) from [] (__lock_acquire+0x78/0x270c) [ 2.323856] [] (__lock_acquire) from [] (lock_acquire+0xe0/0x22c) [ 2.331649] [] (lock_acquire) from [] (_raw_spin_lock_irqsave+0x54/0x68) [ 2.340048] [] (_raw_spin_lock_irqsave) from [] (ptp_qoriq_settime+0x38/0x80) [ 2.348878] [] (ptp_qoriq_settime) from [] (ptp_qoriq_init+0x1f8/0x484) [ 2.357189] [] (ptp_qoriq_init) from [] (ptp_qoriq_probe+0xd0/0x184) [ 2.365243] [] (ptp_qoriq_probe) from [] (platform_drv_probe+0x48/0x9c) [ 2.373555] [] (platform_drv_probe) from [] (really_probe+0x1c4/0x400) [ 2.381779] [] (really_probe) from [] (driver_probe_device+0x78/0x1b8) [ 2.390003] [] (driver_probe_device) from [] (device_driver_attach+0x58/0x60) [ 2.398832] [] (device_driver_attach) from [] (__driver_attach+0xfc/0x160) [ 2.407402] [] (__driver_attach) from [] (bus_for_each_dev+0x68/0xb4) [ 2.415539] [] (bus_for_each_dev) from [] (bus_add_driver+0x104/0x20c) [ 2.423763] [] (bus_add_driver) from [] (driver_register+0x78/0x10c) [ 2.431815] [] (driver_register) from [] (do_one_initcall+0x8c/0x3ac) [ 2.439954] [] (do_one_initcall) from [] (kernel_init_freeable+0x468/0x548) [ 2.448610] [] (kernel_init_freeable) from [] (kernel_init+0x8/0x10c) [ 2.456745] [] (kernel_init) from [] (ret_from_fork+0x14/0x20) [ 2.464273] Exception stack(0xea89ffb0 to 0xea89fff8) [ 2.469297] ffa0: 00000000 00000000 00000000 00000000 [ 2.477432] ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 2.485566] ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 Fixes: ff54571a747b ("ptp_qoriq: convert to use ptp_qoriq_init/free") Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- drivers/ptp/ptp_qoriq.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/ptp') diff --git a/drivers/ptp/ptp_qoriq.c b/drivers/ptp/ptp_qoriq.c index c61f00b72e15..a577218d1ab7 100644 --- a/drivers/ptp/ptp_qoriq.c +++ b/drivers/ptp/ptp_qoriq.c @@ -507,6 +507,8 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base, ptp_qoriq->regs.etts_regs = base + ETTS_REGS_OFFSET; } + spin_lock_init(&ptp_qoriq->lock); + ktime_get_real_ts64(&now); ptp_qoriq_settime(&ptp_qoriq->caps, &now); @@ -514,7 +516,6 @@ int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base, (ptp_qoriq->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT | (ptp_qoriq->cksel & CKSEL_MASK) << CKSEL_SHIFT; - spin_lock_init(&ptp_qoriq->lock); spin_lock_irqsave(&ptp_qoriq->lock, flags); regs = &ptp_qoriq->regs; -- cgit v1.2.3