xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[SCSI] libsas, libata: fix start of life for a sas ata_port

Browse Source 
This changes the ordering of initialization and probing events from:
  1/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  2/ allocate ata_port and schedule port probe in DISCE_PROBE
...to:
  1/ allocate ata_port in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  2/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  3/ schedule port probe in DISCE_PROBE

This ordering prevents PHYE_SIGNAL_LOSS_EVENTS from sneaking in to
destrory ata devices before they have been fully initialized:

  BUG: unable to handle kernel paging request at 0000000000003b10
  IP: [<ffffffffa0053d7e>] sas_ata_end_eh+0x12/0x5e [libsas]
  ...
  [<ffffffffa004d1af>] sas_unregister_common_dev+0x78/0xc9 [libsas]
  [<ffffffffa004d4d4>] sas_unregister_dev+0x4f/0xad [libsas]
  [<ffffffffa004d5b1>] sas_unregister_domain_devices+0x7f/0xbf [libsas]
  [<ffffffffa004c487>] sas_deform_port+0x61/0x1b8 [libsas]
  [<ffffffffa004bed0>] sas_phye_loss_of_signal+0x29/0x2b [libsas]

...and kills the awkward "sata domain_device briefly existing in the
domain without an ata_port" state.

Reported-by: Michal Kosciowski <michal.kosciowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Dan Williams
2012-03-21 21:09:07 -07:00
committed by James Bottomley
parent 0f3fce5cc7
commit b202445925
7 changed files with 56 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/scsi/libsas/sas_ata.c
View File

@@ -546,11 +546,12 @@ static struct ata_port_info sata_port_info = {
.port_ops = &sas_sata_ops
};
int sas_ata_init_host_and_port(struct domain_device *found_dev)
int sas_ata_init(struct domain_device *found_dev)
{
struct sas_ha_struct *ha = found_dev->port->ha;
struct Scsi_Host *shost = ha->core.shost;
struct ata_port *ap;
int rc;
ata_host_init(&found_dev->sata_dev.ata_host,
ha->dev,
@@ -567,8 +568,11 @@ int sas_ata_init_host_and_port(struct domain_device *found_dev)
ap->private_data = found_dev;
ap->cbl = ATA_CBL_SATA;
ap->scsi_host = shost;
/* publish initialized ata port */
smp_wmb();
rc = ata_sas_port_init(ap);
if (rc) {
ata_sas_port_destroy(ap);
return rc;
}
found_dev->sata_dev.ap = ap;
return 0;
@@ -648,18 +652,13 @@ static void sas_get_ata_command_set(struct domain_device *dev)
void sas_probe_sata(struct asd_sas_port *port)
{
struct domain_device *dev, *n;
int err;
mutex_lock(&port->ha->disco_mutex);
list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
list_for_each_entry(dev, &port->disco_list, disco_list_node) {
if (!dev_is_sata(dev))
continue;
err = sas_ata_init_host_and_port(dev);
if (err)
sas_fail_probe(dev, __func__, err);
else
ata_sas_async_port_init(dev->sata_dev.ap);
ata_sas_async_probe(dev->sata_dev.ap);
}
mutex_unlock(&port->ha->disco_mutex);
@@ -718,18 +717,6 @@ static void async_sas_ata_eh(void *data, async_cookie_t cookie)
sas_put_device(dev);
}
static bool sas_ata_dev_eh_valid(struct domain_device *dev)
{
struct ata_port *ap;
if (!dev_is_sata(dev))
return false;
ap = dev->sata_dev.ap;
/* consume fully initialized ata ports */
smp_rmb();
return !!ap;
}
void sas_ata_strategy_handler(struct Scsi_Host *shost)
{
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
@@ -753,7 +740,7 @@ void sas_ata_strategy_handler(struct Scsi_Host *shost)
spin_lock(&port->dev_list_lock);
list_for_each_entry(dev, &port->dev_list, dev_list_node) {
if (!sas_ata_dev_eh_valid(dev))
if (!dev_is_sata(dev))
continue;
async_schedule_domain(async_sas_ata_eh, dev, &async);
}