[SCSI] fnic: Allocate OS interrupt resources just before enabling interrupts (2e76f767) · Commits · 戴 / test

The OS interrupt vectors were getting allocated before the interrupt resources were mapped from hardware. For Legacy interrupts, since they are shared with other devices, as soon as an interrupt is registered with the OS, it can fire while the fnic isr resource is still unmapped. This can cause crash because of access to unmapped resources. For MSIX and MSI, since interrupts are not shared with other devices, this problem didnt happen, because the interrupt is enabled as the last step before returning from _probe. For Legacy however, since the interrupt is shared, the handler can be called as soon as it is registered. Solution is to register interrupt handlers with OS as last step before enabling device interrupts. Signed-off-by:

Abhijeet Joglekar <abjoglek@cisco.com> Signed-off-by:

Robert Love <robert.w.love@intel.com> Signed-off-by:

James Bottomley <James.Bottomley@suse.de>

drivers/scsi/fnic/fnic_main.c

+10 −11

Original line number	Diff line number	Diff line
		@@ -572,19 +572,12 @@ static int __devinit fnic_probe(struct pci_dev *pdev,
		goto err_out_dev_close;
		}

		err = fnic_request_intr(fnic);
		if (err) {
		shost_printk(KERN_ERR, fnic->lport->host,
		"Unable to request irq.\n");
		goto err_out_clear_intr;
		}

		err = fnic_alloc_vnic_resources(fnic);
		if (err) {
		shost_printk(KERN_ERR, fnic->lport->host,
		"Failed to alloc vNIC resources, "
		"aborting.\n");
		goto err_out_free_intr;
		goto err_out_clear_intr;
		}


		@@ -729,6 +722,14 @@ static int __devinit fnic_probe(struct pci_dev *pdev,
		fc_fabric_login(lp);

		vnic_dev_enable(fnic->vdev);

		err = fnic_request_intr(fnic);
		if (err) {
		shost_printk(KERN_ERR, fnic->lport->host,
		"Unable to request irq.\n");
		goto err_out_free_exch_mgr;
		}

		for (i = 0; i < fnic->intr_count; i++)
		vnic_intr_unmask(&fnic->intr[i]);

		@@ -753,8 +754,6 @@ err_out_free_ioreq_pool:
		mempool_destroy(fnic->io_req_pool);
		err_out_free_resources:
		fnic_free_vnic_resources(fnic);
		err_out_free_intr:
		fnic_free_intr(fnic);
		err_out_clear_intr:
		fnic_clear_intr_mode(fnic);
		err_out_dev_close:
		@@ -828,8 +827,8 @@ static void __devexit fnic_remove(struct pci_dev *pdev)
		scsi_remove_host(fnic->lport->host);
		fc_exch_mgr_free(fnic->lport);
		vnic_dev_notify_unset(fnic->vdev);
		fnic_free_vnic_resources(fnic);
		fnic_free_intr(fnic);
		fnic_free_vnic_resources(fnic);
		fnic_clear_intr_mode(fnic);
		vnic_dev_close(fnic->vdev);
		vnic_dev_unregister(fnic->vdev);

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