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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-12-31 16:30:46 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-01-15 13:43:59 +0100 |
| commit | 433cbd57d190a1cdd02f243df41c3d7f55ec4b94 (patch) | |
| tree | 8fa629daec768b8ce02448b2d1eedff4df4d98d0 /arch | |
| parent | 8a580f70f6936ec095da217018cdeeb5835c0207 (diff) | |
| download | linux-433cbd57d190a1cdd02f243df41c3d7f55ec4b94.tar.gz | |
x86/irq: Reorganize the return path in assign_irq_vector
Use an explicit goto for the cases where we have success in the search/update and return -ENOSPC if the search loop ends due to no space. Preparatory patch for fixes. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Borislav Petkov <bp@alien8.de> Tested-by: Joe Lawrence <joe.lawrence@stratus.com> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Jeremiah Mahler <jmmahler@gmail.com> Cc: andy.shevchenko@gmail.com Cc: Guenter Roeck <linux@roeck-us.net> Cc: stable@vger.kernel.org #4.3+ Link: http://lkml.kernel.org/r/20151231160106.403491024@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/apic/vector.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index 19082cf56616..613b1cd8eecb 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -118,13 +118,12 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, */ static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START; static int current_offset = VECTOR_OFFSET_START % 16; - int cpu, err; + int cpu; if (d->move_in_progress) return -EBUSY; /* Only try and allocate irqs on cpus that are present */ - err = -ENOSPC; cpumask_clear(d->old_domain); cpumask_clear(searched_cpumask); cpu = cpumask_first_and(mask, cpu_online_mask); @@ -134,9 +133,8 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, apic->vector_allocation_domain(cpu, vector_cpumask, mask); if (cpumask_subset(vector_cpumask, d->domain)) { - err = 0; if (cpumask_equal(vector_cpumask, d->domain)) - break; + goto success; /* * New cpumask using the vector is a proper subset of * the current in use mask. So cleanup the vector @@ -147,7 +145,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, d->move_in_progress = cpumask_intersects(d->old_domain, cpu_online_mask); cpumask_and(d->domain, d->domain, vector_cpumask); - break; + goto success; } vector = current_vector; @@ -187,17 +185,13 @@ next: per_cpu(vector_irq, new_cpu)[vector] = irq_to_desc(irq); d->cfg.vector = vector; cpumask_copy(d->domain, vector_cpumask); - err = 0; - break; + goto success; } + return -ENOSPC; - if (!err) { - /* cache destination APIC IDs into cfg->dest_apicid */ - err = apic->cpu_mask_to_apicid_and(mask, d->domain, - &d->cfg.dest_apicid); - } - - return err; +success: + /* cache destination APIC IDs into cfg->dest_apicid */ + return apic->cpu_mask_to_apicid_and(mask, d->domain, &d->cfg.dest_apicid); } static int assign_irq_vector(int irq, struct apic_chip_data *data, |