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Subject[PATCH 2/4 resend] 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, Hugh Dixon.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
First posted on 2006-03-19, updated on 2006-04-14 (more iPods added).
This patch is already in -mm.
Index: linux-2.6.17-rc4/drivers/ieee1394/sbp2.h
===================================================================
--- linux-2.6.17-rc4.orig/drivers/ieee1394/sbp2.h 2006-05-15 21:48:38.000000000 +0200
+++ linux-2.6.17-rc4/drivers/ieee1394/sbp2.h 2006-05-15 21:51:13.000000000 +0200
@@ -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 {
Index: linux-2.6.17-rc4/drivers/ieee1394/sbp2.c
===================================================================
--- linux-2.6.17-rc4.orig/drivers/ieee1394/sbp2.c 2006-05-15 21:48:38.000000000 +0200
+++ linux-2.6.17-rc4/drivers/ieee1394/sbp2.c 2006-05-15 21:51:13.000000000 +0200
@@ -151,6 +151,11 @@ MODULE_PARM_DESC(exclusive_login, "Exclu
* - 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 arou
", 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_
*/
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(st
}

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(stru
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;
}


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