[PATCH v2 09/10] irqchip/gic-v5: Clean the allocated linear device table size

[Sascha Bischoff]

When the linear device table exceeds the kmalloc limit, the driver
caps the DeviceID width before allocation but keeps the original size
for cache maintenance. On a noncoherent ITS, this cleans beyond the
allocated table.

Recalculate the size after capping the DeviceID width.

Fixes: 57d72196dfc85 ("irqchip/gic-v5: Add GICv5 ITS support")
Signed-off-by: Sascha Bischoff <sascha.bischoff@xxxxxxx>
---
 drivers/irqchip/irq-gic-v5-its.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v5-its.c b/drivers/irqchip/irq-gic-v5-its.c
index 4de07bbdc4923..aebab9f306476 100644
--- a/drivers/irqchip/irq-gic-v5-its.c
+++ b/drivers/irqchip/irq-gic-v5-its.c
@@ -594,14 +594,14 @@ static int gicv5_its_alloc_devtab_linear(struct gicv5_its_chip_data *its,
 	 * kmalloc limits so that the system can chug along with a linear
 	 * device table.
 	 */
-	sz = BIT_ULL(device_id_bits) * sizeof(*devtab);
-	if (sz > KMALLOC_MAX_SIZE) {
-		u8 device_id_cap = ilog2(KMALLOC_MAX_SIZE/sizeof(*devtab));
+	if (BIT_ULL(device_id_bits) * sizeof(*devtab) > KMALLOC_MAX_SIZE) {
+		u8 device_id_cap = ilog2(KMALLOC_MAX_SIZE / sizeof(*devtab));
 
 		pr_warn("Limiting device ID bits from %u to %u\n",
 			device_id_bits, device_id_cap);
 		device_id_bits = device_id_cap;
 	}
+	sz = BIT_ULL(device_id_bits) * sizeof(*devtab);
 
 	devtab = kcalloc(BIT(device_id_bits), sizeof(*devtab), GFP_KERNEL);
 	if (!devtab)

-- 
2.34.1