linux-kernel - [PATCH v2] reset: brcmstb: Fix resource checks

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Message-Id: <20191101041821.30931-1-f.fainelli@gmail.com>
Date:   Thu, 31 Oct 2019 21:18:21 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        bcm-kernel-feedback-list@...adcom.com (maintainer:BROADCOM BCM7XXX ARM
        ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] reset: brcmstb: Fix resource checks

The use of IS_ALIGNED() is incorrect, the typical resource we pass looks
like this: start: 0x8404318, size: 0x30. When using IS_ALIGNED() we will
get the following 0x8404318 & (0x18 - 1) = 0x10 which is definitively
not equal to 0, same goes with the size.

Replace this with an appropriate check on the start address and the
resource size to be a multiple of SW_INIT_BANK_SIZE.

Fixes: 77750bc089e4 ("reset: Add Broadcom STB SW_INIT reset controller driver")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
Changes in v2:

- simply check that the resource size is at least SW_INIT_BANK_SIZE

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

diff --git a/drivers/reset/reset-brcmstb.c b/drivers/reset/reset-brcmstb.c
index a608f445dad6..208a87aaee53 100644
--- a/drivers/reset/reset-brcmstb.c
+++ b/drivers/reset/reset-brcmstb.c
@@ -91,8 +91,8 @@ static int brcmstb_reset_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!IS_ALIGNED(res->start, SW_INIT_BANK_SIZE) ||
-	    !IS_ALIGNED(resource_size(res), SW_INIT_BANK_SIZE)) {
+	if ((res->start & SW_INIT_BANK_SIZE) != SW_INIT_BANK_SIZE ||
+	    !DIV_ROUND_DOWN_ULL(resource_size(res), SW_INIT_BANK_SIZE)) {
 		dev_err(kdev, "incorrect register range\n");
 		return -EINVAL;
 	}
-- 
2.17.1