On 09/14/2015 05:08 AM, Jiang Liu wrote:
> Due to having no hardware for testing, this is just a sample code
> to support PCI device hot-removal. It just passing compilation,
> no any tests.
>
> Signed-off-by: Jiang Liu <jiang....@linux.intel.com>
> ---
> drivers/scsi/eata.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
> index b92e6856f909..f3bd7cbf260e 100644
> --- a/drivers/scsi/eata.c
> +++ b/drivers/scsi/eata.c
> @@ -1474,6 +1474,21 @@ static unsigned int port_probe(unsigned long port_base,
> #ifdef CONFIG_PCI
> static int eata2x_pci_device_count;
>
> +/* TODO: need help here to shutdown the scsi host and release resources */
> +static void port_remove(unsigned int id, resource_size_t port_base,
> + struct pci_dev *pdev)
> +{
> + struct Scsi_Host *shost = sh[id];
> +
> + /* TODO: stop scsi device */
> + scsi_unregister(shost);
> + /* TODO: clean up resources allocated by port_detect() */
> + clear_bit(id, eata_board_bitmap);
> + free_irq(shost->irq, &sha[id]);
> + release_region(port_base, REGION_SIZE);
> + ida_simple_remove(&eata_ida, id);
> +}
> +
> static int eata2x_pci_probe(struct pci_dev *dev, const struct pci_device_id
> *id)
> {
> int i, ret = -ENXIO;
> @@ -1521,6 +1536,16 @@ out_error:
> return ret;
> }
>
> +static void eata2x_pci_remove(struct pci_dev *pdev)
> +{
> + int id = (int)(long)dev_get_drvdata(&pdev->dev);
> + resource_size_t port_base;
> +
> + port_base = pci_resource_start(pdev, 0) + PCI_BASE_ADDRESS_0;
> + port_remove(id, port_base, pdev);
> + pci_disable_device(pdev);
> +}
> +
> static struct pci_device_id eata2x_tbl[] = {
> { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_SCSI << 8, PCI_ANY_ID) },
> { },
> @@ -1531,6 +1556,7 @@ static struct pci_driver eata2x_pci_driver = {
> .name = "eata",
> .id_table = eata2x_tbl,
> .probe = eata2x_pci_probe,
> + .remove = eata2x_pci_remove,
> };
>
> static int eata2x_probe_pci_devices(struct scsi_host_template *tpnt)
>
Welll ... if you don't have hardware (and I strongly hope you refer to
'hardware able to do hotplugging', not 'hardware for the eata driver'
...) why add the code at all?
Chances are no-one will ever need eata PCI hotplug; SCSI parallel
typically isn't very good at hotplugging, so throwing in PCI hotplug
will only confuse matters more.
Plus due to the sheer mechanics involved here I find it very unlikely
anyone will be using it in real life.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
h...@suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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