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libata: Add a per-host flag to opt-in into parallel port probes

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This patch adds a per host flag that allows drivers to opt in into
having its busses scanned in parallel.

Drivers that do not set this flag get their ports scanned in
the "original" sequence.

Signed-off-by: Arjan van de Ven <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Arjan van de Ven 2009-01-09 15:54:07 -08:00 • committed by Linus Torvalds
commit 886ad09fc8
3 changed files with 13 additions and 0 deletions
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3
drivers/ata/ahci.c
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@ -2660,6 +2660,9 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
host->iomap = pcim_iomap_table(pdev);
host->private_data = hpriv;
if (!(hpriv->cap & HOST_CAP_SSS))
host->flags |= ATA_HOST_PARALLEL_SCAN;
if (pi.flags & ATA_FLAG_EM)
ahci_reset_em(host);

9
drivers/ata/libata-core.c
View file

@ -5920,6 +5920,15 @@ static void async_port_probe(void *data, async_cookie_t cookie)
{
int rc;
struct ata_port *ap = data;
/*
* If we're not allowed to scan this host in parallel,
* we need to wait until all previous scans have completed
* before going further.
*/
if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN))
async_synchronize_cookie(cookie);
/* probe */
if (ap->ops->error_handler) {
struct ata_eh_info *ehi = &ap->link.eh_info;