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scsi: qedf: Fix firmware halt over suspend and resume

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While performing certain power-off sequences, PCI drivers are called to
suspend and resume their underlying devices through PCI PM (power
management) interface. However the hardware does not support PCI PM
suspend/resume operations so system wide suspend/resume leads to bad MFW
(management firmware) state which causes various follow-up errors in driver
when communicating with the device/firmware.

To fix this driver implements PCI PM suspend handler to indicate
unsupported operation to the PCI subsystem explicitly, thus avoiding system
to go into suspended/standby mode.

Fixes: 61d8658b4a ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Link: https://lore.kernel.org/r/20230807093725.46829-1-njavali@marvell.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Nilesh Javali 2023-08-07 15:07:24 +05:30 • committed by Martin K. Petersen
parent 1516ee035d
commit ef222f551e
1 changed files with 18 additions and 0 deletions
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18
drivers/scsi/qedf/qedf_main.c
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@ -31,6 +31,7 @@ static void qedf_remove(struct pci_dev *pdev);
static void qedf_shutdown(struct pci_dev *pdev);
static void qedf_schedule_recovery_handler(void *dev);
static void qedf_recovery_handler(struct work_struct *work);
static int qedf_suspend(struct pci_dev *pdev, pm_message_t state);
/*
* Driver module parameters.
@ -3271,6 +3272,7 @@ static struct pci_driver qedf_pci_driver = {
.probe = qedf_probe,
.remove = qedf_remove,
.shutdown = qedf_shutdown,
.suspend = qedf_suspend,
};
static int __qedf_probe(struct pci_dev *pdev, int mode)
@ -4000,6 +4002,22 @@ static void qedf_shutdown(struct pci_dev *pdev)
__qedf_remove(pdev, QEDF_MODE_NORMAL);
}
static int qedf_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct qedf_ctx *qedf;
if (!pdev) {
QEDF_ERR(NULL, "pdev is NULL.\n");
return -ENODEV;
}
qedf = pci_get_drvdata(pdev);
QEDF_ERR(&qedf->dbg_ctx, "%s: Device does not support suspend operation\n", __func__);
return -EPERM;
}
/*
* Recovery handler code
*/