ide: don't enable IORDY at a probe time

* Add 'unsigned long port_flags' field to ide_hwif_t.

* Add IDE_PFLAG_PROBING port flag and keep it set during probing.

* Fix ide_pio_need_iordy() to not enable IORDY at a probe time
  (IORDY may lead to controller lock up on certain controllers
   if the port is not occupied).

Loosely based on the recent libata's fix by Tejun, thanks to Alan
for the hint that IDE may also need it.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index f371b0de314f75374a6728d206dabb3a24ef676e..fdd04bcd5568a68481b1bd9dd423da30f8743f18 100644 (file)
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1378,6 +1378,9 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
 
                ide_init_port(hwif, i & 1, d);
                ide_port_cable_detect(hwif);
+
+               hwif->port_flags |= IDE_PFLAG_PROBING;
+
                ide_port_init_devices(hwif);
        }
 
@@ -1388,6 +1391,8 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
                if (ide_probe_port(hwif) == 0)
                        hwif->present = 1;
 
+               hwif->port_flags &= ~IDE_PFLAG_PROBING;
+
                if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
                    hwif->mate == NULL || hwif->mate->present == 0) {
                        if (ide_register_port(hwif)) {
@@ -1569,11 +1574,20 @@ EXPORT_SYMBOL_GPL(ide_host_remove);
 
 void ide_port_scan(ide_hwif_t *hwif)
 {
+       int rc;
+
        ide_port_apply_params(hwif);
        ide_port_cable_detect(hwif);
+
+       hwif->port_flags |= IDE_PFLAG_PROBING;
+
        ide_port_init_devices(hwif);
 
-       if (ide_probe_port(hwif) < 0)
+       rc = ide_probe_port(hwif);
+
+       hwif->port_flags &= ~IDE_PFLAG_PROBING;
+
+       if (rc < 0)
                return;
 
        hwif->present = 1;

diff --git a/drivers/ide/ide-xfer-mode.c b/drivers/ide/ide-xfer-mode.c
index 0b47ca139079d03e39b3800267f4abdddeb2815a..46d203ce60cc4ab879be08a85b2f2a8540ddd88e 100644 (file)
--- a/drivers/ide/ide-xfer-mode.c
+++ b/drivers/ide/ide-xfer-mode.c
@@ -109,6 +109,12 @@ EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
 
 int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio)
 {
+       /*
+        * IORDY may lead to controller lock up on certain controllers
+        * if the port is not occupied.
+        */
+       if (pio == 0 && (drive->hwif->port_flags & IDE_PFLAG_PROBING))
+               return 0;
        return ata_id_pio_need_iordy(drive->id, pio);
 }
 EXPORT_SYMBOL_GPL(ide_pio_need_iordy);

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 8c7f5e50e91298423c01c3da2dc4d157ed7ec664..8771d49aa87495664fff5db3cbbbb6adae6794f3 100644 (file)
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -661,6 +661,10 @@ struct ide_dma_ops {
        u8      (*dma_sff_read_status)(struct hwif_s *);
 };
 
+enum {
+       IDE_PFLAG_PROBING               = (1 << 0),
+};
+
 struct ide_host;
 
 typedef struct hwif_s {
@@ -677,6 +681,8 @@ typedef struct hwif_s {
 
        ide_drive_t     *devices[MAX_DRIVES + 1];
 
+       unsigned long   port_flags;
+
        u8 major;       /* our major number */
        u8 index;       /* 0 for ide0; 1 for ide1; ... */
        u8 channel;     /* for dual-port chips: 0=primary, 1=secondary */