diff options
| -rw-r--r-- | drivers/pci/endpoint/functions/pci-epf-test.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index ee90ba3a957b..fa48e9b3c393 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -613,9 +613,14 @@ static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test, struct pci_epf *epf = epf_test->epf; struct device *dev = &epf->dev; struct pci_epc *epc = epf->epc; + u32 status = reg->status | STATUS_IRQ_RAISED; int count; - reg->status |= STATUS_IRQ_RAISED; + /* + * Set the status before raising the IRQ to ensure that the host sees + * the updated value when it gets the IRQ. + */ + WRITE_ONCE(reg->status, status); switch (reg->irq_type) { case IRQ_TYPE_LEGACY: @@ -659,12 +664,12 @@ static void pci_epf_test_cmd_handler(struct work_struct *work) enum pci_barno test_reg_bar = epf_test->test_reg_bar; struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar]; - command = reg->command; + command = READ_ONCE(reg->command); if (!command) goto reset_handler; - reg->command = 0; - reg->status = 0; + WRITE_ONCE(reg->command, 0); + WRITE_ONCE(reg->status, 0); if (reg->irq_type > IRQ_TYPE_MSIX) { dev_err(dev, "Failed to detect IRQ type\n"); |