d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

intrng: Releasing interrupt source should clear interrupt table full state.

Browse Source 
The first release of an interrupt in a situation where the interrupt table
is full should schedule a full table check the next time an interrupt is
allocated. A full check is necessary to ensure maximum separation between
the order of allocation and the order of release.

Submitted by:	ehem_freebsd@m5p.com (initial version)
Discussed in:	https://reviews.freebsd.org/D29310
MFC after:	4 weeks
This commit is contained in:
Michal Meloun 2021-07-02 20:17:36 +02:00
parent f39dd6a978
commit a49f208d94
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sys/kern/subr_intr.c
View File

@ -447,6 +447,16 @@ isrc_free_irq(struct intr_irqsrc *isrc)
irq_sources[isrc->isrc_irq] = NULL;
isrc->isrc_irq = INTR_IRQ_INVALID; /* just to be safe */
/*
* If we are recovering from the state irq_sources table is full,
* then the following allocation should check the entire table. This
* will ensure maximum separation of allocation order from release
* order.
*/
if (irq_next_free >= intr_nirq)
irq_next_free = 0;
return (0);
}