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Subject[PATCH] Re: 2.4.17 Oops when trying to mount ATAPI CDROM
Patch to fix the oops as encountered by Manuel McLure

Quick browse of the trace...

<snip>
Code; c0193030 <config_drive_xfer_rate+d0/110>
0: 8a 15 63 00 00 00 mov 0x63,%dl <== Oops happens here
Code; c0193036 <config_drive_xfer_rate+d6/110>
6: 83 e2 08 and $0x8,%edx <== [1]
<snip>

specific_chipset_driver.c:
config_drive_xfer_rate (ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
[...]
if (id && (id->capability & 1) && HWIF(drive)->autodma) { <== [1]
[...]
} else if ((id->capability & 8) \ <== 2
|| (id->field_valid & 2)) {
<snip>

[1] In this case we get to 2 because we failed the if (id) check, but then we don't check again...

Patch diffed against 2.4.18-pre7 and applies to 2.5.3-pre6 with offsets.

--- linux-2.4.18-pre7/drivers/ide/aec62xx.c.orig Mon Feb 4 22:35:54 2002
+++ linux-2.4.18-pre7/drivers/ide/aec62xx.c Mon Feb 4 23:00:19 2002
@@ -445,7 +445,10 @@
struct hd_driveid *id = drive->id;
ide_dma_action_t dma_func = ide_dma_on;

- if (id && (id->capability & 1) && HWIF(drive)->autodma) {
+ if (id == NULL)
+ goto done;
+
+ if ((id->capability & 1) && HWIF(drive)->autodma) {
/* Consult the list of known "bad" drives */
if (ide_dmaproc(ide_dma_bad_drive, drive)) {
dma_func = ide_dma_off;
@@ -486,6 +489,7 @@
no_dma_set:
aec62xx_tune_drive(drive, 5);
}
+done:
return HWIF(drive)->dmaproc(dma_func, drive);
}

--- linux-2.4.18-pre7/drivers/ide/amd74xx.c.orig Mon Feb 4 22:36:29 2002
+++ linux-2.4.18-pre7/drivers/ide/amd74xx.c Mon Feb 4 23:00:30 2002
@@ -344,7 +344,10 @@
struct hd_driveid *id = drive->id;
ide_dma_action_t dma_func = ide_dma_on;

- if (id && (id->capability & 1) && HWIF(drive)->autodma) {
+ if (id == NULL)
+ goto done;
+
+ if ((id->capability & 1) && HWIF(drive)->autodma) {
/* Consult the list of known "bad" drives */
if (ide_dmaproc(ide_dma_bad_drive, drive)) {
dma_func = ide_dma_off;
@@ -388,6 +391,7 @@

config_chipset_for_pio(drive);
}
+done:
return HWIF(drive)->dmaproc(dma_func, drive);
}

--- linux-2.4.18-pre7/drivers/ide/hpt34x.c.orig Mon Feb 4 22:36:51 2002
+++ linux-2.4.18-pre7/drivers/ide/hpt34x.c Mon Feb 4 22:56:37 2002
@@ -255,7 +255,10 @@
struct hd_driveid *id = drive->id;
ide_dma_action_t dma_func = ide_dma_on;

- if (id && (id->capability & 1) && HWIF(drive)->autodma) {
+ if (id == NULL)
+ goto done;
+
+ if ((id->capability & 1) && HWIF(drive)->autodma) {
/* Consult the list of known "bad" drives */
if (ide_dmaproc(ide_dma_bad_drive, drive)) {
dma_func = ide_dma_off;
@@ -302,6 +305,7 @@
dma_func = ide_dma_off;
#endif /* CONFIG_HPT34X_AUTODMA */

+done:
return HWIF(drive)->dmaproc(dma_func, drive);
}

--- linux-2.4.18-pre7/drivers/ide/hpt366.c.orig Mon Feb 4 22:37:18 2002
+++ linux-2.4.18-pre7/drivers/ide/hpt366.c Mon Feb 4 23:00:03 2002
@@ -553,7 +553,10 @@
struct hd_driveid *id = drive->id;
ide_dma_action_t dma_func = ide_dma_on;

- if (id && (id->capability & 1) && HWIF(drive)->autodma) {
+ if (id == NULL)
+ goto done;
+
+ if ((id->capability & 1) && HWIF(drive)->autodma) {
/* Consult the list of known "bad" drives */
if (ide_dmaproc(ide_dma_bad_drive, drive)) {
dma_func = ide_dma_off;
@@ -594,6 +597,7 @@

config_chipset_for_pio(drive);
}
+done:
return HWIF(drive)->dmaproc(dma_func, drive);
}

--- linux-2.4.18-pre7/drivers/ide/pdc202xx.c.orig Mon Feb 4 22:37:39 2002
+++ linux-2.4.18-pre7/drivers/ide/pdc202xx.c Mon Feb 4 23:04:00 2002
@@ -677,7 +677,10 @@
ide_hwif_t *hwif = HWIF(drive);
ide_dma_action_t dma_func = ide_dma_off_quietly;

- if (id && (id->capability & 1) && hwif->autodma) {
+ if (id == NULL)
+ goto done;
+
+ if ((id->capability & 1) && hwif->autodma) {
/* Consult the list of known "bad" drives */
if (ide_dmaproc(ide_dma_bad_drive, drive)) {
dma_func = ide_dma_off;
@@ -718,7 +721,7 @@
no_dma_set:
(void) config_chipset_for_pio(drive, 5);
}
-
+done:
return HWIF(drive)->dmaproc(dma_func, drive);
}

--- linux-2.4.18-pre7/drivers/ide/piix.c.orig Mon Feb 4 22:37:57 2002
+++ linux-2.4.18-pre7/drivers/ide/piix.c Tue Feb 5 01:00:26 2002
@@ -417,7 +417,10 @@
struct hd_driveid *id = drive->id;
ide_dma_action_t dma_func = ide_dma_on;

- if (id && (id->capability & 1) && HWIF(drive)->autodma) {
+ if (id == NULL)
+ goto done;
+
+ if ((id->capability & 1) && HWIF(drive)->autodma) {
/* Consult the list of known "bad" drives */
if (ide_dmaproc(ide_dma_bad_drive, drive)) {
dma_func = ide_dma_off;
@@ -458,6 +461,7 @@
no_dma_set:
config_chipset_for_pio(drive);
}
+done:
return HWIF(drive)->dmaproc(dma_func, drive);
}

--- linux-2.4.18-pre7/drivers/ide/serverworks.c.orig Mon Feb 4 22:38:16 2002
+++ linux-2.4.18-pre7/drivers/ide/serverworks.c Mon Feb 4 23:05:07 2002
@@ -450,7 +450,10 @@
struct hd_driveid *id = drive->id;
ide_dma_action_t dma_func = ide_dma_on;

- if (id && (id->capability & 1) && HWIF(drive)->autodma) {
+ if (id == NULL)
+ goto done;
+
+ if ((id->capability & 1) && HWIF(drive)->autodma) {
/* Consult the list of known "bad" drives */
if (ide_dmaproc(ide_dma_bad_drive, drive)) {
dma_func = ide_dma_off;
@@ -491,6 +494,7 @@
no_dma_set:
config_chipset_for_pio(drive);
}
+done:
return HWIF(drive)->dmaproc(dma_func, drive);
}

--- linux-2.4.18-pre7/drivers/ide/sis5513.c.orig Mon Feb 4 22:22:42 2002
+++ linux-2.4.18-pre7/drivers/ide/sis5513.c Tue Feb 5 00:59:43 2002
@@ -506,8 +506,11 @@
{
struct hd_driveid *id = drive->id;
ide_dma_action_t dma_func = ide_dma_off_quietly;
+
+ if (id == NULL)
+ goto done;

- if (id && (id->capability & 1) && HWIF(drive)->autodma) {
+ if ((id->capability & 1) && HWIF(drive)->autodma) {
/* Consult the list of known "bad" drives */
if (ide_dmaproc(ide_dma_bad_drive, drive)) {
dma_func = ide_dma_off;
@@ -546,7 +549,7 @@
no_dma_set:
(void) config_chipset_for_pio(drive, 5);
}
-
+done:
return HWIF(drive)->dmaproc(dma_func, drive);
}

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