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misc: pci_endpoint_test: Re-init completion for every test

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commit fb620ae73b70c2f57b9d3e911fc24c024ba2324f upstream.

The irq_raised completion used to detect the end of a test case is
initialized when the test device is probed, but never reinitialized again
before a test case. As a result, the irq_raised completion synchronization
is effective only for the first ioctl test case executed. Any subsequent
call to wait_for_completion() by another ioctl() call will immediately
return, potentially too early, leading to false positive failures.

Fix this by reinitializing the irq_raised completion before starting a new
ioctl() test command.

Link: https://lore.kernel.org/r/20230415023542.77601-16-dlemoal@kernel.org
Fixes: 2c156ac71c ("misc: Add host side PCI driver for PCI test function device")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Damien Le Moal 2023-04-15 11:35:40 +09:00 committed by Greg Kroah-Hartman
parent dd22103792
commit dac4afa3ef
1 changed files with 4 additions and 0 deletions
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4
drivers/misc/pci_endpoint_test.c
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@ -590,6 +590,10 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
struct pci_dev *pdev = test->pdev;
mutex_lock(&test->mutex);
reinit_completion(&test->irq_raised);
test->last_irq = -ENODATA;
switch (cmd) {
case PCITEST_BAR:
bar = arg;