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From:   Gaurav Kohli <gkohli@codeaurora.org>
To:     tglx@linutronix.de, maz@kernel.org
Cc:     linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        Gaurav Kohli <gkohli@codeaurora.org>
Subject: [PATCH v0] irqchip/gic-v3: Avoid check of lpi configuration for non existent cpu
Date:   Thu,  5 Dec 2019 16:25:57 +0530
Message-Id: <1575543357-31892-1-git-send-email-gkohli@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

As per GIC specification, we can configure gic for more no of cpus
then the available cpus in the soc, But this can cause mem abort
while iterating lpi region for non existent cpu as we don't map
redistrubutor region for non-existent cpu.

To avoid this issue, put one more check of valid mpidr.

Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 1edc993..adc9186 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -766,6 +766,7 @@ static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *))
 {
 	int ret = -ENODEV;
 	int i;
+	int cpu = 0;
 
 	for (i = 0; i < gic_data.nr_redist_regions; i++) {
 		void __iomem *ptr = gic_data.redist_regions[i].redist_base;
@@ -780,6 +781,7 @@ static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *))
 		}
 
 		do {
+			cpu++;
 			typer = gic_read_typer(ptr + GICR_TYPER);
 			ret = fn(gic_data.redist_regions + i, ptr);
 			if (!ret)
@@ -795,7 +797,8 @@ static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *))
 				if (typer & GICR_TYPER_VLPIS)
 					ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
 			}
-		} while (!(typer & GICR_TYPER_LAST));
+		} while (!(typer & GICR_TYPER_LAST) &&
+					cpu_logical_map(cpu) != INVALID_HWID);
 	}
 
 	return ret ? -ENODEV : 0;
-- 
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