Patch "MIPS: cevt-r4k: Don't call get_c0_compare_int if timer irq is installed" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    MIPS: cevt-r4k: Don't call get_c0_compare_int if timer irq is installed

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mips-cevt-r4k-don-t-call-get_c0_compare_int-if-timer.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e2071aecd17f3ae0b0d17395b435c72366788ac6
Author: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Date:   Tue Aug 13 10:59:08 2024 +0100

    MIPS: cevt-r4k: Don't call get_c0_compare_int if timer irq is installed
    
    [ Upstream commit 50f2b98dc83de7809a5c5bf0ccf9af2e75c37c13 ]
    
    This avoids warning:
    
    [    0.118053] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:283
    
    Caused by get_c0_compare_int on secondary CPU.
    
    We also skipped saving IRQ number to struct clock_event_device *cd as
    it's never used by clockevent core, as per comments it's only meant
    for "non CPU local devices".
    
    Reported-by: Serge Semin <fancer.lancer@xxxxxxxxx>
    Closes: https://lore.kernel.org/linux-mips/6szkkqxpsw26zajwysdrwplpjvhl5abpnmxgu2xuj3dkzjnvsf@4daqrz4mf44k/
    Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
    Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
    Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
    Tested-by: Serge Semin <fancer.lancer@xxxxxxxxx>
    Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
index 32ec67c9ab67..77028aa8c107 100644
--- a/arch/mips/kernel/cevt-r4k.c
+++ b/arch/mips/kernel/cevt-r4k.c
@@ -303,13 +303,6 @@ int r4k_clockevent_init(void)
 	if (!c0_compare_int_usable())
 		return -ENXIO;
 
-	/*
-	 * With vectored interrupts things are getting platform specific.
-	 * get_c0_compare_int is a hook to allow a platform to return the
-	 * interrupt number of its liking.
-	 */
-	irq = get_c0_compare_int();
-
 	cd = &per_cpu(mips_clockevent_device, cpu);
 
 	cd->name		= "MIPS";
@@ -320,7 +313,6 @@ int r4k_clockevent_init(void)
 	min_delta		= calculate_min_delta();
 
 	cd->rating		= 300;
-	cd->irq			= irq;
 	cd->cpumask		= cpumask_of(cpu);
 	cd->set_next_event	= mips_next_event;
 	cd->event_handler	= mips_event_handler;
@@ -332,6 +324,13 @@ int r4k_clockevent_init(void)
 
 	cp0_timer_irq_installed = 1;
 
+	/*
+	 * With vectored interrupts things are getting platform specific.
+	 * get_c0_compare_int is a hook to allow a platform to return the
+	 * interrupt number of its liking.
+	 */
+	irq = get_c0_compare_int();
+
 	if (request_irq(irq, c0_compare_interrupt, flags, "timer",
 			c0_compare_interrupt))
 		pr_err("Failed to request irq %d (timer)\n", irq);