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Subject[PATCH] Re: 2.6.14-rc4-mm1 and later: second ata_piix controller is invisible
Max Kellermann wrote:
> Hi Andrew,
>
> since 2.6.14-rc4-mm1, my second ata_piix (SATA) controller does not
> show up in dmesg, effectively hiding /dev/sdb. 2.6.14-rc2-mm2 and
> older (with the same kernel config) were ok, the same for Linus'
> kernels: 2.6.14-rc5 without -mm1 has /dev/sdb, too.
>
> 0000:00:1f.2 IDE interface: Intel Corp. 82801EB (ICH5) Serial ATA 150
> Storage Controller (rev 02) (prog-if 8f [Master SecP SecO PriP PriO])
> 0000:00:1f.2 0101: 8086:24d1 (rev 02)
>
> This PCI device (on-board on an Asus P4 mainboard) has two SATA
> connectors, showing up as ata1/sda and ata2/sdb.

I think I found the bug. ata_pci_init_one() got confused about the
meaning of 'n_ports'. I also found another bug in the same area,
related to legacy initialization.

See the attached patch for a suggested fix (ignore ata_piix changes,
which are obviously unrelated).

Jeff


diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c
index be02147..b7fbf11 100644
--- a/drivers/scsi/ata_piix.c
+++ b/drivers/scsi/ata_piix.c
@@ -45,6 +45,7 @@
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
+#include <linux/device.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include <linux/libata.h>
@@ -625,7 +626,8 @@ static int piix_init_one (struct pci_dev
unsigned int pata_chan = 0, sata_chan = 0;

if (!printed_version++)
- printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
+ dev_printk(KERN_DEBUG, &pdev->dev,
+ "version " DRV_VERSION "\n");

/* no hotplugging support (FIXME) */
if (!in_module_init)
@@ -672,7 +674,9 @@ static int piix_init_one (struct pci_dev
port_info[pata_chan] = &piix_port_info[ich5_pata];
n_ports++;

- printk(KERN_WARNING DRV_NAME ": combined mode detected\n");
+ dev_printk(KERN_WARNING, &pdev->dev,
+ "combined mode detected (p=%u, s=%u)\n",
+ pata_chan, sata_chan);
}

return ata_pci_init_one(pdev, port_info, n_ports);
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index cc089f1..4fa3621 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -4491,10 +4491,10 @@ void ata_pci_host_stop (struct ata_host_
*/

struct ata_probe_ent *
-ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int ports)
+ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info *port, int ports)
{
struct ata_probe_ent *probe_ent =
- ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
+ ata_probe_ent_alloc(pci_dev_to_dev(pdev), port);
int p = 0;

if (!probe_ent)
@@ -4527,11 +4527,11 @@ ata_pci_init_native_mode(struct pci_dev
return probe_ent;
}

-static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev, struct ata_port_info **port, int port_num)
+static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev, struct ata_port_info *port, int port_num)
{
struct ata_probe_ent *probe_ent;

- probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
+ probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port);
if (!probe_ent)
return NULL;

@@ -4678,14 +4678,19 @@ int ata_pci_init_one (struct pci_dev *pd

if (legacy_mode) {
if (legacy_mode & (1 << 0))
- probe_ent = ata_pci_init_legacy_port(pdev, port, 0);
+ probe_ent = ata_pci_init_legacy_port(pdev, port[0], 0);
if (legacy_mode & (1 << 1))
- probe_ent2 = ata_pci_init_legacy_port(pdev, port, 1);
+ probe_ent2 = ata_pci_init_legacy_port(pdev, port[1], 1);
} else {
- if (n_ports == 2)
- probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
- else
- probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY);
+ if (n_ports == 1)
+ probe_ent = ata_pci_init_native_mode(pdev, port[0],
+ ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+ else {
+ probe_ent = ata_pci_init_native_mode(pdev, port[0],
+ ATA_PORT_PRIMARY);
+ probe_ent2 = ata_pci_init_native_mode(pdev, port[1],
+ ATA_PORT_PRIMARY);
+ }
}
if (!probe_ent && !probe_ent2) {
rc = -ENOMEM;
@@ -4695,13 +4700,10 @@ int ata_pci_init_one (struct pci_dev *pd
pci_set_master(pdev);

/* FIXME: check ata_device_add return */
- if (legacy_mode) {
- if (legacy_mode & (1 << 0))
- ata_device_add(probe_ent);
- if (legacy_mode & (1 << 1))
- ata_device_add(probe_ent2);
- } else
+ if (probe_ent)
ata_device_add(probe_ent);
+ if (probe_ent2)
+ ata_device_add(probe_ent2);

kfree(probe_ent);
kfree(probe_ent2);
diff --git a/drivers/scsi/sata_nv.c b/drivers/scsi/sata_nv.c
index 1a56d6c..596a4e0 100644
--- a/drivers/scsi/sata_nv.c
+++ b/drivers/scsi/sata_nv.c
@@ -405,7 +405,7 @@ static int nv_init_one (struct pci_dev *
rc = -ENOMEM;

ppi = &nv_port_info;
- probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+ probe_ent = ata_pci_init_native_mode(pdev, ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
if (!probe_ent)
goto err_out_regions;

diff --git a/drivers/scsi/sata_sis.c b/drivers/scsi/sata_sis.c
index 057f7b9..d3bcd38 100644
--- a/drivers/scsi/sata_sis.c
+++ b/drivers/scsi/sata_sis.c
@@ -263,7 +263,7 @@ static int sis_init_one (struct pci_dev
goto err_out_regions;

ppi = &sis_port_info;
- probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+ probe_ent = ata_pci_init_native_mode(pdev, ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
if (!probe_ent) {
rc = -ENOMEM;
goto err_out_regions;
diff --git a/drivers/scsi/sata_uli.c b/drivers/scsi/sata_uli.c
index d68dc7d..145405a 100644
--- a/drivers/scsi/sata_uli.c
+++ b/drivers/scsi/sata_uli.c
@@ -202,7 +202,7 @@ static int uli_init_one (struct pci_dev
goto err_out_regions;

ppi = &uli_port_info;
- probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+ probe_ent = ata_pci_init_native_mode(pdev, ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
if (!probe_ent) {
rc = -ENOMEM;
goto err_out_regions;
diff --git a/drivers/scsi/sata_via.c b/drivers/scsi/sata_via.c
index 80e291a..f2a2736 100644
--- a/drivers/scsi/sata_via.c
+++ b/drivers/scsi/sata_via.c
@@ -212,7 +212,7 @@ static struct ata_probe_ent *vt6420_init
struct ata_probe_ent *probe_ent;
struct ata_port_info *ppi = &svia_port_info;

- probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+ probe_ent = ata_pci_init_native_mode(pdev, ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
if (!probe_ent)
return NULL;

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 0ba3af7..e75112d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -506,7 +506,7 @@ struct pci_bits {

extern void ata_pci_host_stop (struct ata_host_set *host_set);
extern struct ata_probe_ent *
-ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int portmask);
+ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info *port, int portmask);
extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);

#endif /* CONFIG_PCI */
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