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[PATCH] sbp2: add read_capacity workaround for iPod 

Apple decided to copy some USB stupidity over to FireWire.

The sector number returned by iPods from read_capacity is one too many.
This may cause I/O errors, especially if the kernel is configured for EFI
partition support. We use the same workaround as usb-storage but have to
check for different model IDs.

	http://marc.theaimsgroup.com/?t=114233262300001
	https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187409

Acknowledgements:
  Diagnosis and therapy by Mathieu Chouquet-Stringer <ml2news@free.fr>,
  additional data about affected and unaffected Apple hardware from
  Vladimir Kotal, Sander De Graaf, Bryan Olmstead and Hugh Dixon.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stefan Richter 2006-05-15 22:06:37 +02:00 committed by Linus Torvalds
parent 24d3bf884e
commit e9a1c52c7b
2 changed files with 46 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/ieee1394/sbp2.c
View File

@ -151,6 +151,11 @@ MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device (default = 1)"
* - skip mode page 8
* Suppress sending of mode_sense for mode page 8 if the device pretends to
* support the SCSI Primary Block commands instead of Reduced Block Commands.
*
* - fix capacity
* Tell sd_mod to correct the last sector number reported by read_capacity.
* Avoids access beyond actual disk limits on devices with an off-by-one bug.
* Don't use this with devices which don't have this bug.
*/
static int sbp2_default_workarounds;
module_param_named(workarounds, sbp2_default_workarounds, int, 0644);
@ -158,6 +163,7 @@ MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36)
", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
", or a combination)");
/* legacy parameter */
@ -291,6 +297,7 @@ static struct hpsb_protocol_driver sbp2_driver = {
*/
static const struct {
u32 firmware_revision;
u32 model_id;
unsigned workarounds;
} sbp2_workarounds_table[] = {
/* TSB42AA9 */ {
@ -305,6 +312,31 @@ static const struct {
/* Symbios bridge */ {
.firmware_revision = 0xa0b800,
.workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
},
/*
* Note about the following Apple iPod blacklist entries:
*
* There are iPods (2nd gen, 3rd gen) with model_id==0. Since our
* matching logic treats 0 as a wildcard, we cannot match this ID
* without rewriting the matching routine. Fortunately these iPods
* do not feature the read_capacity bug according to one report.
* Read_capacity behaviour as well as model_id could change due to
* Apple-supplied firmware updates though.
*/
/* iPod 4th generation */ {
.firmware_revision = 0x0a2700,
.model_id = 0x000021,
.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
},
/* iPod mini */ {
.firmware_revision = 0x0a2700,
.model_id = 0x000023,
.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
},
/* iPod Photo */ {
.firmware_revision = 0x0a2700,
.model_id = 0x00007e,
.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
}
};
@ -1556,18 +1588,25 @@ static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id,
}
for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
if (sbp2_workarounds_table[i].firmware_revision !=
if (sbp2_workarounds_table[i].firmware_revision &&
sbp2_workarounds_table[i].firmware_revision !=
(firmware_revision & 0xffff00))
continue;
if (sbp2_workarounds_table[i].model_id &&
sbp2_workarounds_table[i].model_id != ud->model_id)
continue;
workarounds |= sbp2_workarounds_table[i].workarounds;
break;
}
if (workarounds)
SBP2_INFO("Workarounds for node " NODE_BUS_FMT ": "
"0x%x (firmware_revision 0x%x)",
SBP2_INFO("Workarounds for node " NODE_BUS_FMT ": 0x%x "
"(firmware_revision 0x%06x, vendor_id 0x%06x,"
" model_id 0x%06x)",
NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid),
workarounds, firmware_revision);
workarounds, firmware_revision,
ud->vendor_id ? ud->vendor_id : ud->ne->vendor_id,
ud->model_id);
/* We would need one SCSI host template for each target to adjust
* max_sectors on the fly, therefore warn only. */
@ -2488,6 +2527,8 @@ static int sbp2scsi_slave_configure(struct scsi_device *sdev)
if (sdev->type == TYPE_DISK &&
scsi_id->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
sdev->skip_ms_page_8 = 1;
if (scsi_id->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
sdev->fix_capacity = 1;
return 0;
}

1
drivers/ieee1394/sbp2.h
View File

@ -238,6 +238,7 @@ struct sbp2_status_block {
#define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
#define SBP2_WORKAROUND_INQUIRY_36 0x2
#define SBP2_WORKAROUND_MODE_SENSE_8 0x4
#define SBP2_WORKAROUND_FIX_CAPACITY 0x8
/* This is the two dma types we use for cmd_dma below */
enum cmd_dma_types {