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scsi: qedi: Fix firmware halt over suspend and resume 

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: ace7f46ba5 ("scsi: qedi: Add QLogic FastLinQ offload iSCSI driver framework.")
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Link: https://lore.kernel.org/r/20230807093725.46829-2-njavali@marvell.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Nilesh Javali 2023-08-07 15:07:25 +05:30 committed by Martin K. Petersen
parent dd64f80587
commit 1516ee035d
1 changed files with 18 additions and 0 deletions
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18
drivers/scsi/qedi/qedi_main.c
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@ -69,6 +69,7 @@ static struct nvm_iscsi_block *qedi_get_nvram_block(struct qedi_ctx *qedi);
static void qedi_recovery_handler(struct work_struct *work);
static void qedi_schedule_hw_err_handler(void *dev,
enum qed_hw_err_type err_type);
static int qedi_suspend(struct pci_dev *pdev, pm_message_t state);
static int qedi_iscsi_event_cb(void *context, u8 fw_event_code, void *fw_handle)
{
@ -2511,6 +2512,22 @@ static void qedi_shutdown(struct pci_dev *pdev)
__qedi_remove(pdev, QEDI_MODE_SHUTDOWN);
}
static int qedi_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct qedi_ctx *qedi;
if (!pdev) {
QEDI_ERR(NULL, "pdev is NULL.\n");
return -ENODEV;
}
qedi = pci_get_drvdata(pdev);
QEDI_ERR(&qedi->dbg_ctx, "%s: Device does not support suspend operation\n", __func__);
return -EPERM;
}
static int __qedi_probe(struct pci_dev *pdev, int mode)
{
struct qedi_ctx *qedi;
@ -2869,6 +2886,7 @@ static struct pci_driver qedi_pci_driver = {
.remove = qedi_remove,
.shutdown = qedi_shutdown,
.err_handler = &qedi_err_handler,
.suspend = qedi_suspend,
};
static int __init qedi_init(void)