This is a note to let you know that I've just added the patch titled
usb-storage: redo incorrect reads
to the 2.6.39-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-storage-redo-incorrect-reads.patch
and it can be found in the queue-2.6.39 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 21c13a4f7bc185552c4b402b792c3bbb9aa69df0 Mon Sep 17 00:00:00 2001
From: Alan Stern <[email protected]>
Date: Tue, 7 Jun 2011 11:35:52 -0400
Subject: usb-storage: redo incorrect reads
From: Alan Stern <[email protected]>
commit 21c13a4f7bc185552c4b402b792c3bbb9aa69df0 upstream.
Some USB mass-storage devices have bugs that cause them not to handle
the first READ(10) command they receive correctly. The Corsair
Padlock v2 returns completely bogus data for its first read (possibly
it returns the data in encrypted form even though the device is
supposed to be unlocked). The Feiya SD/SDHC card reader fails to
complete the first READ(10) command after it is plugged in or after a
new card is inserted, returning a status code that indicates it thinks
the command was invalid, which prevents the kernel from retrying the
read.
Since the first read of a new device or a new medium is for the
partition sector, the kernel is unable to retrieve the device's
partition table. Users have to manually issue an "hdparm -z" or
"blockdev --rereadpt" command before they can access the device.
This patch (as1470) works around the problem. It adds a new quirk
flag, US_FL_INVALID_READ10, indicating that the first READ(10) should
always be retried immediately, as should any failing READ(10) commands
(provided the preceding READ(10) command succeeded, to avoid getting
stuck in a loop). The patch also adds appropriate unusual_devs
entries containing the new flag.
Signed-off-by: Alan Stern <[email protected]>
Tested-by: Sven Geggus <[email protected]>
Tested-by: Paul Hartman <[email protected]>
CC: Matthew Dharm <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
Documentation/kernel-parameters.txt | 2 ++
drivers/usb/storage/transport.c | 29 +++++++++++++++++++++++++++++
drivers/usb/storage/unusual_devs.h | 19 +++++++++++++++++++
drivers/usb/storage/usb.c | 13 ++++++++++++-
drivers/usb/storage/usb.h | 2 ++
include/linux/usb_usual.h | 4 +++-
6 files changed, 67 insertions(+), 2 deletions(-)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2590,6 +2590,8 @@ bytes respectively. Such letter suffixes
unlock ejectable media);
m = MAX_SECTORS_64 (don't transfer more
than 64 sectors = 32 KB at a time);
+ n = INITIAL_READ10 (force a retry of the
+ initial READ(10) command);
o = CAPACITY_OK (accept the capacity
reported by the device);
r = IGNORE_RESIDUE (the device reports
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -819,6 +819,35 @@ Retry_Sense:
}
}
+ /*
+ * Some devices don't work or return incorrect data the first
+ * time they get a READ(10) command, or for the first READ(10)
+ * after a media change. If the INITIAL_READ10 flag is set,
+ * keep track of whether READ(10) commands succeed. If the
+ * previous one succeeded and this one failed, set the REDO_READ10
+ * flag to force a retry.
+ */
+ if (unlikely((us->fflags & US_FL_INITIAL_READ10) &&
+ srb->cmnd[0] == READ_10)) {
+ if (srb->result == SAM_STAT_GOOD) {
+ set_bit(US_FLIDX_READ10_WORKED, &us->dflags);
+ } else if (test_bit(US_FLIDX_READ10_WORKED, &us->dflags)) {
+ clear_bit(US_FLIDX_READ10_WORKED, &us->dflags);
+ set_bit(US_FLIDX_REDO_READ10, &us->dflags);
+ }
+
+ /*
+ * Next, if the REDO_READ10 flag is set, return a result
+ * code that will cause the SCSI core to retry the READ(10)
+ * command immediately.
+ */
+ if (test_bit(US_FLIDX_REDO_READ10, &us->dflags)) {
+ clear_bit(US_FLIDX_REDO_READ10, &us->dflags);
+ srb->result = DID_IMM_RETRY << 16;
+ srb->sense_buffer[0] = 0;
+ }
+ }
+
/* Did we transfer less than the minimum amount required? */
if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) &&
scsi_bufflen(srb) - scsi_get_resid(srb) <
srb->underflow)
--- a/drivers/usb/storage/unusual_devs.h
+++ b/drivers/usb/storage/unusual_devs.h
@@ -1114,6 +1114,16 @@ UNUSUAL_DEV( 0x090c, 0x1132, 0x0000, 0xf
USB_SC_DEVICE, USB_PR_DEVICE, NULL,
US_FL_FIX_CAPACITY ),
+/* Reported by Paul Hartman <[email protected]>
+ * This card reader returns "Illegal Request, Logical Block Address
+ * Out of Range" for the first READ(10) after a new card is inserted.
+ */
+UNUSUAL_DEV( 0x090c, 0x6000, 0x0100, 0x0100,
+ "Feiya",
+ "SD/SDHC Card Reader",
+ USB_SC_DEVICE, USB_PR_DEVICE, NULL,
+ US_FL_INITIAL_READ10 ),
+
/* This Pentax still camera is not conformant
* to the USB storage specification: -
* - It does not like the INQUIRY command. So we must handle this command
@@ -1888,6 +1898,15 @@ UNUSUAL_DEV( 0x1908, 0x3335, 0x0200, 0x0
USB_SC_DEVICE, USB_PR_DEVICE, NULL,
US_FL_NO_READ_DISC_INFO ),
+/* Reported by Sven Geggus <[email protected]>
+ * This encrypted pen drive returns bogus data for the initial READ(10).
+ */
+UNUSUAL_DEV( 0x1b1c, 0x1ab5, 0x0200, 0x0200,
+ "Corsair",
+ "Padlock v2",
+ USB_SC_DEVICE, USB_PR_DEVICE, NULL,
+ US_FL_INITIAL_READ10 ),
+
/* Patch by Richard Schütz <[email protected]>
* This external hard drive enclosure uses a JMicron chip which
* needs the US_FL_IGNORE_RESIDUE flag to work properly. */
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -439,7 +439,8 @@ static void adjust_quirks(struct us_data
US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
- US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT);
+ US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT |
+ US_FL_INITIAL_READ10);
p = quirks;
while (*p) {
@@ -483,6 +484,9 @@ static void adjust_quirks(struct us_data
case 'm':
f |= US_FL_MAX_SECTORS_64;
break;
+ case 'n':
+ f |= US_FL_INITIAL_READ10;
+ break;
case 'o':
f |= US_FL_CAPACITY_OK;
break;
@@ -946,6 +950,13 @@ int usb_stor_probe2(struct us_data *us)
if (result)
goto BadDevice;
+ /*
+ * If the device returns invalid data for the first READ(10)
+ * command, indicate the command should be retried.
+ */
+ if (us->fflags & US_FL_INITIAL_READ10)
+ set_bit(US_FLIDX_REDO_READ10, &us->dflags);
+
/* Acquire all the other resources and add the host */
result = usb_stor_acquire_resources(us);
if (result)
--- a/drivers/usb/storage/usb.h
+++ b/drivers/usb/storage/usb.h
@@ -73,6 +73,8 @@ struct us_unusual_dev {
#define US_FLIDX_RESETTING 4 /* device reset in progress */
#define US_FLIDX_TIMED_OUT 5 /* SCSI midlayer timed out */
#define US_FLIDX_DONT_SCAN 6 /* don't scan (disconnect) */
+#define US_FLIDX_REDO_READ10 7 /* redo READ(10) command */
+#define US_FLIDX_READ10_WORKED 8 /* previous READ(10) succeeded */
#define USB_STOR_STRING_LEN 32
--- a/include/linux/usb_usual.h
+++ b/include/linux/usb_usual.h
@@ -62,7 +62,9 @@
US_FLAG(NO_READ_DISC_INFO, 0x00040000) \
/* cannot handle READ_DISC_INFO */ \
US_FLAG(NO_READ_CAPACITY_16, 0x00080000) \
- /* cannot handle READ_CAPACITY_16 */
+ /* cannot handle READ_CAPACITY_16 */ \
+ US_FLAG(INITIAL_READ10, 0x00100000) \
+ /* Initial READ(10) (and others) must be retried */
#define US_FLAG(name, value) US_FL_##name = value ,
enum { US_DO_ALL_FLAGS };
Patches currently in stable-queue which might be from [email protected]
are
queue-2.6.39/usb-storage-redo-incorrect-reads.patch
queue-2.6.39/usb-core-tolerate-protocol-stall-during-hub-and-port.patch
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