GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-02 20:29:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

genirq: keep affinities set from userspace across free/request_irq()

Browse source 
Impact: preserve user-modified affinities on interrupts

Kumar Galak noticed that commit
1840475676 (genirq: Expose default irq
affinity mask (take 3))

overrides an already set affinity setting across a free /
request_irq(). Happens e.g. with ifdown/ifup of a network device.

Change the logic to mark the affinities as set and keep them
intact. This also fixes the unlocked access to irq_desc in
irq_select_affinity() when called from irq_affinity_proc_write()

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-11-07 13:18:30 +01:00 • committed by Ingo Molnar
parent 8b805ef617
commit f6d87f4bd2
5 changed files with 53 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

2
kernel/irq/proc.c
View file

@ -62,7 +62,7 @@ static ssize_t irq_affinity_proc_write(struct file *file,
if (!cpus_intersects(new_value, cpu_online_map))
/* Special case for empty set - allow the architecture
code to set default SMP affinity. */
return irq_select_affinity(irq) ? -EINVAL : count;
return irq_select_affinity_usr(irq) ? -EINVAL : count;
irq_set_affinity(irq, new_value);