This is a note to let you know that I've just added the patch titled
PCI: aardvark: Do not clear status bits of masked interrupts
to the 4.19-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:
pci-aardvark-do-not-clear-status-bits-of-masked-interrupts.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a7ca6d7fa3c02c032db5440ff392d96c04684c21 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@xxxxxxxxxx>
Date: Tue, 5 Oct 2021 20:09:45 +0200
Subject: PCI: aardvark: Do not clear status bits of masked interrupts
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From: Pali Rohár <pali@xxxxxxxxxx>
commit a7ca6d7fa3c02c032db5440ff392d96c04684c21 upstream.
The PCIE_ISR1_REG says which interrupts are currently set / active,
including those which are masked.
The driver currently reads this register and looks if some unmasked
interrupts are active, and if not, it clears status bits of _all_
interrupts, including the masked ones.
This is incorrect, since, for example, some drivers may poll these bits.
Remove this clearing, and also remove this early return statement
completely, since it does not change functionality in any way.
Link: https://lore.kernel.org/r/20211005180952.6812-7-kabel@xxxxxxxxxx
Fixes: 8c39d710363c ("PCI: aardvark: Add Aardvark PCI host controller driver")
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Signed-off-by: Marek Behún <kabel@xxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Reviewed-by: Marek Behún <kabel@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/controller/pci-aardvark.c | 6 ------
1 file changed, 6 deletions(-)
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -828,12 +828,6 @@ static void advk_pcie_handle_int(struct
isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK);
- if (!isr0_status && !isr1_status) {
- advk_writel(pcie, isr0_val, PCIE_ISR0_REG);
- advk_writel(pcie, isr1_val, PCIE_ISR1_REG);
- return;
- }
-
/* Process MSI interrupts */
if (isr0_status & PCIE_ISR0_MSI_INT_PENDING)
advk_pcie_handle_msi(pcie);
Patches currently in stable-queue which might be from pali@xxxxxxxxxx are
queue-4.19/pci-mark-atheros-qca6174-to-avoid-bus-reset.patch
queue-4.19/serial-core-fix-initializing-and-restoring-termios-speed.patch
queue-4.19/pci-aardvark-fix-return-value-of-msi-domain-.alloc-method.patch
queue-4.19/pci-aardvark-read-all-16-bits-from-pcie_msi_payload_reg.patch
queue-4.19/pci-aardvark-do-not-unmask-unused-interrupts.patch
queue-4.19/pci-aardvark-do-not-clear-status-bits-of-masked-interrupts.patch
