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@amd.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

On Mon, Jun 13, 2022 at 02:16:27PM -0500, Tom Lendacky wrote:
> 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@amd.com>
> ---
>  drivers/crypto/ccp/sp-platform.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

On Mon, Jun 13, 2022 at 1:16 PM Tom Lendacky <thomas.lendacky@amd.com> wrote:
>
> 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@amd.com>
> ---
>  drivers/crypto/ccp/sp-platform.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)

Reviewed-by: Rob Herring <robh@kernel.org>