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| author | Li Zhong <zhong@linux.vnet.ibm.com> | 2016-11-11 05:57:34 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2017-01-27 00:26:09 +0100 |
| commit | bf5a71d53835110d46d33eb5335713ffdbff9ab6 (patch) | |
| tree | 21f09dcc3174c68e861d1b433ee57d3c0cb4c4c4 /fs/cachefiles/proc.c | |
| parent | KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter (diff) | |
| download | linux-bf5a71d53835110d46d33eb5335713ffdbff9ab6.tar.xz linux-bf5a71d53835110d46d33eb5335713ffdbff9ab6.zip | |
KVM: PPC: Book 3S: XICS: Fix potential issue with duplicate IRQ resends
It is possible that in the following order, one irq is resent twice:
CPU 1 CPU 2
ics_check_resend()
lock ics_lock
see resend set
unlock ics_lock
/* change affinity of the irq */
kvmppc_xics_set_xive()
write_xive()
lock ics_lock
see resend set
unlock ics_lock
icp_deliver_irq() /* resend */
icp_deliver_irq() /* resend again */
It doesn't have any user-visible effect at present, but needs to be avoided
when the following patch implementing the P/Q stuff is applied.
This patch clears the resend flag before releasing the ics lock, when we
know we will do a re-delivery after checking the flag, or setting the flag.
Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'fs/cachefiles/proc.c')
0 files changed, 0 insertions, 0 deletions