linux-kernel - [PATCH 12/12] power: reset: account for const type of of_device

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Date:   Tue,  2 Jan 2018 14:28:08 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Nicolas Ferre <nicolas.ferre@...rochip.com>
Cc:     kernel-janitors@...r.kernel.org,
        Sebastian Reichel <sre@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 12/12] power: reset: account for const type of of_device_id.data

This driver creates a const structure that it stores in the data
field of an of_device_id array.

Add const to the declaration of the location that receives a value
from the data field to ensure that the compiler will continue to check
that the value is not modified and remove the const-dropping cast on
the access to the data field.

Done using Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/power/reset/at91-sama5d2_shdwc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -u -p a/drivers/power/reset/at91-sama5d2_shdwc.c b/drivers/power/reset/at91-sama5d2_shdwc.c
--- a/drivers/power/reset/at91-sama5d2_shdwc.c
+++ b/drivers/power/reset/at91-sama5d2_shdwc.c
@@ -68,7 +68,7 @@ struct shdwc_config {
 };
 
 struct shdwc {
-	struct shdwc_config *cfg;
+	const struct shdwc_config *cfg;
 	void __iomem *at91_shdwc_base;
 };
 
@@ -260,7 +260,7 @@ static int __init at91_shdwc_probe(struc
 	}
 
 	match = of_match_node(at91_shdwc_of_match, pdev->dev.of_node);
-	at91_shdwc->cfg = (struct shdwc_config *)(match->data);
+	at91_shdwc->cfg = match->data;
 
 	sclk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(sclk))