6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Huacai Chen <chenhuacai@xxxxxxxxxxx>
commit 81a91abab1307d7725fa4620952c0767beae7753 upstream.
lpic_gsi_to_irq() should return a valid Linux interrupt number if
acpi_register_gsi() succeeds, and return 0 otherwise. But lpic_gsi_to_irq()
converts a negative return value of acpi_register_gsi() to a positive value
silently.
Convert the return value explicitly.
Fixes: e8bba72b396c ("irqchip / ACPI: Introduce ACPI_IRQ_MODEL_LPIC for LoongArch")
Reported-by: Miao Wang <shankerwangmiao@xxxxxxxxx>
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240723064508.35560-1-chenhuacai@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-loongarch-cpu.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/irqchip/irq-loongarch-cpu.c
+++ b/drivers/irqchip/irq-loongarch-cpu.c
@@ -18,11 +18,13 @@ struct fwnode_handle *cpuintc_handle;
static u32 lpic_gsi_to_irq(u32 gsi)
{
+ int irq = 0;
+
/* Only pch irqdomain transferring is required for LoongArch. */
if (gsi >= GSI_MIN_PCH_IRQ && gsi <= GSI_MAX_PCH_IRQ)
- return acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HIGH);
+ irq = acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HIGH);
- return 0;
+ return (irq > 0) ? irq : 0;
}
static struct fwnode_handle *lpic_get_gsi_domain_id(u32 gsi)
