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author | Finn Thain <fthain@telegraphics.com.au> | 2018-12-01 03:53:10 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-27 16:46:54 +0300 |
commit | 4127249099b796b1fd5c74562ce94b94cda38553 (patch) | |
tree | 2606b8e6ef4cb711c8ff76e3860a26ec018fc82a /arch/m68k/atari | |
parent | 7c662630d94fc07da206a8423bfbf9c2330bb2c8 (diff) | |
download | linux-4127249099b796b1fd5c74562ce94b94cda38553.tar.xz |
m68k: Call timer_interrupt() with interrupts disabled
[ Upstream commit 1efdd4bd254311498123a15fa0acd565f454da97 ]
Some platforms execute their timer handler with the interrupt priority
level set below 6. That means the handler could be interrupted by another
driver and this could lead to re-entry of the timer core.
Avoid this by use of local_irq_save/restore for timer interrupt dispatch.
This provides mutual exclusion around the timer interrupt flag access
which is needed later in this series for the clocksource conversion.
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1811131407120.2697@nanos.tec.linutronix.de
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/m68k/atari')
-rw-r--r-- | arch/m68k/atari/ataints.c | 4 | ||||
-rw-r--r-- | arch/m68k/atari/time.c | 15 |
2 files changed, 16 insertions, 3 deletions
diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c index 3d2b63bedf05..56f02ea2c248 100644 --- a/arch/m68k/atari/ataints.c +++ b/arch/m68k/atari/ataints.c @@ -142,7 +142,7 @@ struct mfptimerbase { .name = "MFP Timer D" }; -static irqreturn_t mfptimer_handler(int irq, void *dev_id) +static irqreturn_t mfp_timer_d_handler(int irq, void *dev_id) { struct mfptimerbase *base = dev_id; int mach_irq; @@ -344,7 +344,7 @@ void __init atari_init_IRQ(void) st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6; /* request timer D dispatch handler */ - if (request_irq(IRQ_MFP_TIMD, mfptimer_handler, IRQF_SHARED, + if (request_irq(IRQ_MFP_TIMD, mfp_timer_d_handler, IRQF_SHARED, stmfp_base.name, &stmfp_base)) pr_err("Couldn't register %s interrupt\n", stmfp_base.name); diff --git a/arch/m68k/atari/time.c b/arch/m68k/atari/time.c index c549b48174ec..972181c1fe4b 100644 --- a/arch/m68k/atari/time.c +++ b/arch/m68k/atari/time.c @@ -24,6 +24,18 @@ DEFINE_SPINLOCK(rtc_lock); EXPORT_SYMBOL_GPL(rtc_lock); +static irqreturn_t mfp_timer_c_handler(int irq, void *dev_id) +{ + irq_handler_t timer_routine = dev_id; + unsigned long flags; + + local_irq_save(flags); + timer_routine(0, NULL); + local_irq_restore(flags); + + return IRQ_HANDLED; +} + void __init atari_sched_init(irq_handler_t timer_routine) { @@ -32,7 +44,8 @@ atari_sched_init(irq_handler_t timer_routine) /* start timer C, div = 1:100 */ st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 15) | 0x60; /* install interrupt service routine for MFP Timer C */ - if (request_irq(IRQ_MFP_TIMC, timer_routine, 0, "timer", timer_routine)) + if (request_irq(IRQ_MFP_TIMC, mfp_timer_c_handler, 0, "timer", + timer_routine)) pr_err("Couldn't register timer interrupt\n"); } |