linux-kernel - [PATCH] crypto: ccp - Fix device IRQ counting by using platform_irq

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Date:   Mon, 13 Jun 2022 14:16:27 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        John Allen <john.allen@....com>, Rob Herring <robh@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH] crypto: ccp - Fix device IRQ counting by using platform_irq_count()

The ccp driver loops through the platform device resources array to get
the IRQ count for the device. With commit a1a2b7125e10 ("of/platform: Drop
static setup of IRQ resource from DT core"), the IRQ resources are no
longer stored in the platform device resource array. As a result, the IRQ
count is now always zero. This causes the driver to issue a second call to
platform_get_irq(), which fails if the IRQ count is really 1, causing the
loading of the driver to fail.

Replace looping through the resources array to count the number of IRQs
with a call to platform_irq_count().

Fixes: a1a2b7125e10 ("of/platform: Drop static setup of IRQ resource from DT core")
Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
---
 drivers/crypto/ccp/sp-platform.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/crypto/ccp/sp-platform.c b/drivers/crypto/ccp/sp-platform.c
index 9dba52fbee99..7d79a8744f9a 100644
--- a/drivers/crypto/ccp/sp-platform.c
+++ b/drivers/crypto/ccp/sp-platform.c
@@ -85,17 +85,9 @@ static int sp_get_irqs(struct sp_device *sp)
 	struct sp_platform *sp_platform = sp->dev_specific;
 	struct device *dev = sp->dev;
 	struct platform_device *pdev = to_platform_device(dev);
-	unsigned int i, count;
 	int ret;
 
-	for (i = 0, count = 0; i < pdev->num_resources; i++) {
-		struct resource *res = &pdev->resource[i];
-
-		if (resource_type(res) == IORESOURCE_IRQ)
-			count++;
-	}
-
-	sp_platform->irq_count = count;
+	sp_platform->irq_count = platform_irq_count(pdev);
 
 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0) {
@@ -104,7 +96,7 @@ static int sp_get_irqs(struct sp_device *sp)
 	}
 
 	sp->psp_irq = ret;
-	if (count == 1) {
+	if (sp_platform->irq_count == 1) {
 		sp->ccp_irq = ret;
 	} else {
 		ret = platform_get_irq(pdev, 1);
-- 
2.36.1