This is a note to let you know that I've just added the patch titled
irqchip/armada-370-xp: Fix support for Multi-MSI interrupts
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
irqchip-armada-370-xp-fix-support-for-multi-msi-interrupts.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d0a553502efd545c1ce3fd08fc4d423f8e4ac3d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@xxxxxxxxxx>
Date: Thu, 25 Nov 2021 14:00:57 +0100
Subject: irqchip/armada-370-xp: Fix support for Multi-MSI interrupts
MIME-Version: 1.0
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From: Pali Rohár <pali@xxxxxxxxxx>
commit d0a553502efd545c1ce3fd08fc4d423f8e4ac3d6 upstream.
irq-armada-370-xp driver already sets MSI_FLAG_MULTI_PCI_MSI flag into
msi_domain_info structure. But allocated interrupt numbers for Multi-MSI
needs to be properly aligned otherwise devices send MSI interrupt with
wrong number.
Fix this issue by using function bitmap_find_free_region() instead of
bitmap_find_next_zero_area() to allocate aligned interrupt numbers.
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Fixes: a71b9412c90c ("irqchip/armada-370-xp: Allow allocation of multiple MSIs")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211125130057.26705-2-pali@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-armada-370-xp.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -232,16 +232,12 @@ static int armada_370_xp_msi_alloc(struc
int hwirq, i;
mutex_lock(&msi_used_lock);
+ hwirq = bitmap_find_free_region(msi_used, PCI_MSI_DOORBELL_NR,
+ order_base_2(nr_irqs));
+ mutex_unlock(&msi_used_lock);
- hwirq = bitmap_find_next_zero_area(msi_used, PCI_MSI_DOORBELL_NR,
- 0, nr_irqs, 0);
- if (hwirq >= PCI_MSI_DOORBELL_NR) {
- mutex_unlock(&msi_used_lock);
+ if (hwirq < 0)
return -ENOSPC;
- }
-
- bitmap_set(msi_used, hwirq, nr_irqs);
- mutex_unlock(&msi_used_lock);
for (i = 0; i < nr_irqs; i++) {
irq_domain_set_info(domain, virq + i, hwirq + i,
@@ -259,7 +255,7 @@ static void armada_370_xp_msi_free(struc
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
mutex_lock(&msi_used_lock);
- bitmap_clear(msi_used, d->hwirq, nr_irqs);
+ bitmap_release_region(msi_used, d->hwirq, order_base_2(nr_irqs));
mutex_unlock(&msi_used_lock);
}
Patches currently in stable-queue which might be from pali@xxxxxxxxxx are
queue-5.15/irqchip-armada-370-xp-fix-return-value-of-armada_370_xp_msi_alloc.patch
queue-5.15/hwmon-dell-smm-fix-warning-on-proc-i8k-creation-error.patch
queue-5.15/revert-pci-aardvark-fix-support-for-pci_rom_address1-on-emulated-bridge.patch
queue-5.15/irqchip-armada-370-xp-fix-support-for-multi-msi-interrupts.patch
