[PATCH v4 2/6] misc: pci_endpoint_test: Avoid issue of interrupts remaining after request_irq error

[Kunihiko Hayashi]

After devm_request_irq() fails with error in
pci_endpoint_test_request_irq(), pci_endpoint_test_free_irq_vectors() is
called assuming that all IRQs have been released.

However some requested IRQs remain unreleased, so there are still
/proc/irq/* entries remaining and this results in WARN() with the following
message:

    remove_proc_entry: removing non-empty directory 'irq/30', leaking at
    least 'pci-endpoint-test.0'
    WARNING: CPU: 0 PID: 202 at fs/proc/generic.c:719 remove_proc_entry
    +0x190/0x19c

To solve this issue, set the number of remaining IRQs to test->num_irqs
and release IRQs in advance by calling pci_endpoint_test_release_irq().

Cc: stable@xxxxxxxxxxxxxxx
Fixes: e03327122e2c ("pci_endpoint_test: Add 2 ioctl commands")
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
---
 drivers/misc/pci_endpoint_test.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index a3d2caa7a6bb..9e56d200d2f0 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -259,6 +259,9 @@ static int pci_endpoint_test_request_irq(struct pci_endpoint_test *test)
 		break;
 	}
 
+	test->num_irqs = i;
+	pci_endpoint_test_release_irq(test);
+
 	return ret;
 }
 
-- 
2.25.1