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Subject[bisected] Re: todays git: WARNING: at drivers/ata/libata-sff.c:1017 ata_sff_hsm_move+0x45e/0x750()

* Ingo Molnar <mingo@elte.hu> wrote:

> build its random kernel and reboot into it (800 MHz P3), so i started a
> full automated bisection instead driven from a faster box.

and the winner is:

| 871af1210f13966ab911ed2166e4ab2ce775b99d is first bad commit
| commit 871af1210f13966ab911ed2166e4ab2ce775b99d
| Author: Alan Cox <alan@redhat.com>
| Date: Mon Jan 5 14:16:39 2009 +0000
|
| libata: Add 32bit PIO support

And the revert below does the trick.

Ingo

--------------------->
From f1d26da598230cc050ee2c7890bd3cebd2e76e27 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Sat, 10 Jan 2009 14:04:57 +0100
Subject: [PATCH] Revert "libata: Add 32bit PIO support"

This reverts commit 871af1210f13966ab911ed2166e4ab2ce775b99d.

[ 3.834413] PM: Adding info for No Bus:8:0
[ 3.835116] sd 0:0:0:0: [sda] Attached SCSI disk
[ 3.835237] driver: '0:0:0:0': driver_bound: bound to device 'sd'
[ 3.835249] bus: 'scsi': really_probe: bound device 0:0:0:0 to driver sd
[ 3.835272] device: '0:0:0:0': device_add
[ 3.835374] PM: Adding info for No Bus:0:0:0:0
[ 4.112738] ata2.00: ATAPI: QSI DVD-ROM SDR-081, EHA8, max UDMA/33
[ 4.120617] ata2.00: configured for UDMA/33
[ 4.121275] ------------[ cut here ]------------
[ 4.121380] WARNING: at drivers/ata/libata-sff.c:1017 ata_sff_hsm_move+0x3d9/0x840()
[ 4.121538] Hardware name: HP OmniBook PC
[ 4.121644] Pid: 0, comm: swapper Not tainted 2.6.28-tip-10029-g20e9954-dirty #3
[ 4.121798] Call Trace:
[ 4.121912] [<c013d006>] warn_slowpath+0x86/0xa0
[ 4.122030] [<c012c5ee>] ? complete+0x4e/0x60
[ 4.122136] [<c0133270>] ? default_wake_function+0x10/0x20
[ 4.122260] [<c034e9bd>] ? _raw_spin_unlock+0x5d/0xa0
[ 4.122368] [<c012c5ee>] ? complete+0x4e/0x60
[ 4.122490] [<c06513d3>] ? ata_qc_complete_internal+0x13/0x20
[ 4.122602] [<c064f6ed>] ? __ata_qc_complete+0x6d/0xe0
[ 4.122710] [<c065e0a9>] ? ata_sff_qc_fill_rtf+0x19/0x30
[ 4.122817] [<c065fa07>] ? ata_sff_data_xfer32+0x77/0xd0
[ 4.122923] [<c0660739>] ata_sff_hsm_move+0x3d9/0x840
[ 4.123029] [<c034eb06>] ? _raw_spin_lock+0x46/0x170
[ 4.123134] [<c0660ef9>] ata_sff_interrupt+0x129/0x1e0
[ 4.123246] [<c0171dc0>] handle_IRQ_event+0x30/0x70
[ 4.123354] [<c0173b05>] handle_level_irq+0x75/0xe0
[ 4.123459] [<c0173a90>] ? handle_level_irq+0x0/0xe0
[ 4.123562] <IRQ> [<c0104607>] ? common_interrupt+0x27/0x2c
[ 4.123725] [<c0120120>] ? native_safe_halt+0x0/0x10
[ 4.123830] [<c012012a>] ? native_safe_halt+0xa/0x10
[ 4.123942] [<c010aaf9>] ? default_idle+0x69/0xa0
[ 4.124053] [<c015f792>] ? tick_nohz_restart_sched_tick+0x32/0x1b0
[ 4.124167] [<c011715f>] ? apm_cpu_idle+0xdf/0x260
[ 4.124273] [<c01027d8>] ? cpu_idle+0x78/0x100
[ 4.124379] [<c034e9bd>] ? _raw_spin_unlock+0x5d/0xa0
[ 4.124490] [<c09a92b3>] ? rest_init+0x53/0x60
[ 4.124601] [<c0e4d82a>] ? start_kernel+0x2ba/0x360
[ 4.124709] [<c0e4d260>] ? unknown_bootoption+0x0/0x210
[ 4.124820] [<c0e4d07c>] ? i386_start_kernel+0x7c/0xb0
[ 4.124948] ---[ end trace 83f9033b42a87df9 ]---
[ 4.126783] scsi 1:0:0:0: CD-ROM QSI DVD-ROM SDR-081 EHA8 PQ: 0 ANSI: 5
[ 4.126979] device: 'target1:0:0': device_add
[ 4.127040] PM: Adding info for No Bus:target1:0:0
[ 4.127057] device: '1:0:0:0': device_add
[ 4.127191] bus: 'scsi': add device 1:0:0:0
[ 4.127235] PM: Adding info for scsi:1:0:0:0
[ 4.127994] bus: 'scsi': driver_probe_device: matched device 1:0:0:0 with driver osst
---
drivers/ata/ata_piix.c | 2 +-
drivers/ata/libata-sff.c | 53 ---------------------------------------------
drivers/ata/pata_ali.c | 6 ++--
drivers/ata/pata_amd.c | 4 +-
drivers/ata/pata_mpiix.c | 3 +-
drivers/ata/pata_sil680.c | 4 +-
include/linux/libata.h | 3 --
7 files changed, 9 insertions(+), 66 deletions(-)

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 887d8f4..7865954 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -310,7 +310,7 @@ static struct scsi_host_template piix_sht = {
};

static struct ata_port_operations piix_pata_ops = {
- .inherits = &ata_bmdma32_port_ops,
+ .inherits = &ata_bmdma_port_ops,
.cable_detect = ata_cable_40wire,
.set_piomode = piix_set_piomode,
.set_dmamode = piix_set_dmamode,
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 0eae9b4..e7c8514 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -80,13 +80,6 @@ const struct ata_port_operations ata_bmdma_port_ops = {
};
EXPORT_SYMBOL_GPL(ata_bmdma_port_ops);

-const struct ata_port_operations ata_bmdma32_port_ops = {
- .inherits = &ata_bmdma_port_ops,
-
- .sff_data_xfer = ata_sff_data_xfer32,
-};
-EXPORT_SYMBOL_GPL(ata_bmdma32_port_ops);
-
/**
* ata_fill_sg - Fill PCI IDE PRD table
* @qc: Metadata associated with taskfile to be transferred
@@ -743,52 +736,6 @@ unsigned int ata_sff_data_xfer(struct ata_device *dev, unsigned char *buf,
EXPORT_SYMBOL_GPL(ata_sff_data_xfer);

/**
- * ata_sff_data_xfer32 - Transfer data by PIO
- * @dev: device to target
- * @buf: data buffer
- * @buflen: buffer length
- * @rw: read/write
- *
- * Transfer data from/to the device data register by PIO using 32bit
- * I/O operations.
- *
- * LOCKING:
- * Inherited from caller.
- *
- * RETURNS:
- * Bytes consumed.
- */
-
-unsigned int ata_sff_data_xfer32(struct ata_device *dev, unsigned char *buf,
- unsigned int buflen, int rw)
-{
- struct ata_port *ap = dev->link->ap;
- void __iomem *data_addr = ap->ioaddr.data_addr;
- unsigned int words = buflen >> 2;
- int slop = buflen & 3;
-
- /* Transfer multiple of 4 bytes */
- if (rw == READ)
- ioread32_rep(data_addr, buf, words);
- else
- iowrite32_rep(data_addr, buf, words);
-
- if (unlikely(slop)) {
- __le32 pad;
- if (rw == READ) {
- pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
- memcpy(buf + buflen - slop, &pad, slop);
- } else {
- memcpy(&pad, buf + buflen - slop, slop);
- iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
- }
- words++;
- }
- return words << 2;
-}
-EXPORT_SYMBOL_GPL(ata_sff_data_xfer32);
-
-/**
* ata_sff_data_xfer_noirq - Transfer data by PIO
* @dev: device to target
* @buf: data buffer
diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c
index a7999c1..a4f9e39 100644
--- a/drivers/ata/pata_ali.c
+++ b/drivers/ata/pata_ali.c
@@ -151,7 +151,8 @@ static void ali_fifo_control(struct ata_port *ap, struct ata_device *adev, int o

pci_read_config_byte(pdev, pio_fifo, &fifo);
fifo &= ~(0x0F << shift);
- fifo |= (on << shift);
+ if (on)
+ fifo |= (on << shift);
pci_write_config_byte(pdev, pio_fifo, fifo);
}

@@ -369,11 +370,10 @@ static struct ata_port_operations ali_early_port_ops = {
.inherits = &ata_sff_port_ops,
.cable_detect = ata_cable_40wire,
.set_piomode = ali_set_piomode,
- .sff_data_xfer = ata_sff_data_xfer32,
};

static const struct ata_port_operations ali_dma_base_ops = {
- .inherits = &ata_bmdma32_port_ops,
+ .inherits = &ata_bmdma_port_ops,
.set_piomode = ali_set_piomode,
.set_dmamode = ali_set_dmamode,
};
diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
index 63719ab..0ec9c7d 100644
--- a/drivers/ata/pata_amd.c
+++ b/drivers/ata/pata_amd.c
@@ -24,7 +24,7 @@
#include <linux/libata.h>

#define DRV_NAME "pata_amd"
-#define DRV_VERSION "0.3.11"
+#define DRV_VERSION "0.3.10"

/**
* timing_setup - shared timing computation and load
@@ -345,7 +345,7 @@ static struct scsi_host_template amd_sht = {
};

static const struct ata_port_operations amd_base_port_ops = {
- .inherits = &ata_bmdma32_port_ops,
+ .inherits = &ata_bmdma_port_ops,
.prereset = amd_pre_reset,
};

diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c
index aa576ca..7c8faa4 100644
--- a/drivers/ata/pata_mpiix.c
+++ b/drivers/ata/pata_mpiix.c
@@ -35,7 +35,7 @@
#include <linux/libata.h>

#define DRV_NAME "pata_mpiix"
-#define DRV_VERSION "0.7.7"
+#define DRV_VERSION "0.7.6"

enum {
IDETIM = 0x6C, /* IDE control register */
@@ -146,7 +146,6 @@ static struct ata_port_operations mpiix_port_ops = {
.cable_detect = ata_cable_40wire,
.set_piomode = mpiix_set_piomode,
.prereset = mpiix_pre_reset,
- .sff_data_xfer = ata_sff_data_xfer32,
};

static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
index 9e764e5..83580a5 100644
--- a/drivers/ata/pata_sil680.c
+++ b/drivers/ata/pata_sil680.c
@@ -32,7 +32,7 @@
#include <linux/libata.h>

#define DRV_NAME "pata_sil680"
-#define DRV_VERSION "0.4.9"
+#define DRV_VERSION "0.4.8"

#define SIL680_MMIO_BAR 5

@@ -195,7 +195,7 @@ static struct scsi_host_template sil680_sht = {
};

static struct ata_port_operations sil680_port_ops = {
- .inherits = &ata_bmdma32_port_ops,
+ .inherits = &ata_bmdma_port_ops,
.cable_detect = sil680_cable_detect,
.set_piomode = sil680_set_piomode,
.set_dmamode = sil680_set_dmamode,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 4f7c8fb..3449de5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1518,7 +1518,6 @@ extern void sata_pmp_error_handler(struct ata_port *ap);

extern const struct ata_port_operations ata_sff_port_ops;
extern const struct ata_port_operations ata_bmdma_port_ops;
-extern const struct ata_port_operations ata_bmdma32_port_ops;

/* PIO only, sg_tablesize and dma_boundary limits can be removed */
#define ATA_PIO_SHT(drv_name) \
@@ -1546,8 +1545,6 @@ extern void ata_sff_exec_command(struct ata_port *ap,
const struct ata_taskfile *tf);
extern unsigned int ata_sff_data_xfer(struct ata_device *dev,
unsigned char *buf, unsigned int buflen, int rw);
-extern unsigned int ata_sff_data_xfer32(struct ata_device *dev,
- unsigned char *buf, unsigned int buflen, int rw);
extern unsigned int ata_sff_data_xfer_noirq(struct ata_device *dev,
unsigned char *buf, unsigned int buflen, int rw);
extern u8 ata_sff_irq_on(struct ata_port *ap);

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