linux-kernel - [PATCH v3 30/37] ARM: davinci: cp-intc: request the memory region before remapping it

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Date:   Tue, 12 Feb 2019 11:38:28 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        David Lechner <david@...hnology.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v3 30/37] ARM: davinci: cp-intc: request the memory region before remapping it

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Add a missing call to request_mem_region() before calling ioremap() to
make sure it's not been requested by another user.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 arch/arm/mach-davinci/cp_intc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/mach-davinci/cp_intc.c b/arch/arm/mach-davinci/cp_intc.c
index f56a4275083f..6ab56af3be6b 100644
--- a/arch/arm/mach-davinci/cp_intc.c
+++ b/arch/arm/mach-davinci/cp_intc.c
@@ -164,6 +164,15 @@ davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,
 {
 	unsigned int num_regs = BITS_TO_LONGS(config->num_irqs);
 	int offset, irq_base;
+	void __iomem *req;
+
+	req = request_mem_region(config->reg.start,
+				 resource_size(&config->reg),
+				 "davinci-cp-intc");
+	if (!req) {
+		pr_err("%s: register range busy\n", __func__);
+		return -EBUSY;
+	}
 
 	davinci_cp_intc_base = ioremap(config->reg.start,
 				       resource_size(&config->reg));
-- 
2.20.1