The branch main has been updated by mmel:
URL:
https://cgit.FreeBSD.org/src/commit/?id=a49f208d94b873b2187adbfe1d785b3bc8bdc598
commit a49f208d94b873b2187adbfe1d785b3bc8bdc598
Author: Michal Meloun <m...@freebsd.org>
AuthorDate: 2021-07-02 18:17:36 +0000
Commit: Michal Meloun <m...@freebsd.org>
CommitDate: 2021-07-08 06:16:46 +0000
intrng: Releasing interrupt source should clear interrupt table full state.
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_free...@m5p.com (initial version)
Discussed in: https://reviews.freebsd.org/D29310
MFC after: 4 weeks
---
sys/kern/subr_intr.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/sys/kern/subr_intr.c b/sys/kern/subr_intr.c
index df6bf9e63ba0..d4926b2e2364 100644
--- a/sys/kern/subr_intr.c
+++ b/sys/kern/subr_intr.c
@@ -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);
}
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