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25ff1c316f
This patch (as1189b) adds some hacks to usb-storage for dealing with the growing problems involving bad capacity values and last-sector accesses: A new flag, US_FL_CAPACITY_OK, is created to indicate that the device is known to report its capacity correctly. An unusual_devs entry for Linux's own File-backed Storage Gadget is added with this flag set, since g_file_storage always reports the correct capacity and since the capacity need not be even (it is determined by the size of the backing file). An entry in unusual_devs.h which has only the CAPACITY_OK flag set shouldn't prejudice libusual, since the device will work perfectly well with either usb-storage or ub. So a new macro, COMPLIANT_DEV, is added to let libusual know about these entries. When a last-sector access succeeds and the total number of sectors is odd (the unexpected case, in which guessing that the number is even might cause trouble), a WARN is triggered. The kerneloops.org project will collect these warnings, allowing us to add CAPACITY_OK flags for the devices in question before implementing the default-to-even heuristic. If users want to prevent the stack dump produced by the WARN, they can disable the hack by adding an unusual_devs entry for their device with the CAPACITY_OK flag. When a last-sector access fails three times in a row and neither the FIX_CAPACITY nor the CAPACITY_OK flag is set, we assume the last-sector bug is present. We replace the existing status and sense data with values that will cause the SCSI core to fail the access immediately rather than retry indefinitely. This should fix the difficulties people have been having with Nokia phones. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
181 lines
6.3 KiB
C
181 lines
6.3 KiB
C
/* Driver for USB Mass Storage compliant devices
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* Main Header File
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*
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* Current development and maintenance by:
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* (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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*
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* Initial work by:
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* (c) 1999 Michael Gee (michael@linuxspecific.com)
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*
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* This driver is based on the 'USB Mass Storage Class' document. This
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* describes in detail the protocol used to communicate with such
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* devices. Clearly, the designers had SCSI and ATAPI commands in
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* mind when they created this document. The commands are all very
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* similar to commands in the SCSI-II and ATAPI specifications.
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*
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* It is important to note that in a number of cases this class
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* exhibits class-specific exemptions from the USB specification.
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* Notably the usage of NAK, STALL and ACK differs from the norm, in
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* that they are used to communicate wait, failed and OK on commands.
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*
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* Also, for certain devices, the interrupt endpoint is used to convey
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* status of a command.
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*
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* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
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* information about this driver.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _USB_H_
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#define _USB_H_
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#include <linux/usb.h>
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#include <linux/usb_usual.h>
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#include <linux/blkdev.h>
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#include <linux/completion.h>
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#include <linux/mutex.h>
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#include <scsi/scsi_host.h>
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struct us_data;
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struct scsi_cmnd;
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/*
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* Unusual device list definitions
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*/
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struct us_unusual_dev {
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const char* vendorName;
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const char* productName;
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__u8 useProtocol;
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__u8 useTransport;
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int (*initFunction)(struct us_data *);
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};
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/* Dynamic bitflag definitions (us->dflags): used in set_bit() etc. */
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#define US_FLIDX_URB_ACTIVE 0 /* current_urb is in use */
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#define US_FLIDX_SG_ACTIVE 1 /* current_sg is in use */
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#define US_FLIDX_ABORTING 2 /* abort is in progress */
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#define US_FLIDX_DISCONNECTING 3 /* disconnect in progress */
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#define US_FLIDX_RESETTING 4 /* device reset in progress */
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#define US_FLIDX_TIMED_OUT 5 /* SCSI midlayer timed out */
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#define US_FLIDX_DONT_SCAN 6 /* don't scan (disconnect) */
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#define USB_STOR_STRING_LEN 32
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/*
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* We provide a DMA-mapped I/O buffer for use with small USB transfers.
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* It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a
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* 31-byte buffer. But Freecom needs a 64-byte buffer, so that's the
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* size we'll allocate.
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*/
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#define US_IOBUF_SIZE 64 /* Size of the DMA-mapped I/O buffer */
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#define US_SENSE_SIZE 18 /* Size of the autosense data buffer */
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typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
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typedef int (*trans_reset)(struct us_data*);
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typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
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typedef void (*extra_data_destructor)(void *); /* extra data destructor */
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typedef void (*pm_hook)(struct us_data *, int); /* power management hook */
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#define US_SUSPEND 0
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#define US_RESUME 1
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/* we allocate one of these for every device that we remember */
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struct us_data {
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/* The device we're working with
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* It's important to note:
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* (o) you must hold dev_mutex to change pusb_dev
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*/
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struct mutex dev_mutex; /* protect pusb_dev */
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struct usb_device *pusb_dev; /* this usb_device */
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struct usb_interface *pusb_intf; /* this interface */
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struct us_unusual_dev *unusual_dev; /* device-filter entry */
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unsigned long fflags; /* fixed flags from filter */
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unsigned long dflags; /* dynamic atomic bitflags */
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unsigned int send_bulk_pipe; /* cached pipe values */
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unsigned int recv_bulk_pipe;
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unsigned int send_ctrl_pipe;
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unsigned int recv_ctrl_pipe;
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unsigned int recv_intr_pipe;
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/* information about the device */
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char *transport_name;
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char *protocol_name;
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__le32 bcs_signature;
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u8 subclass;
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u8 protocol;
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u8 max_lun;
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u8 ifnum; /* interface number */
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u8 ep_bInterval; /* interrupt interval */
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/* function pointers for this device */
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trans_cmnd transport; /* transport function */
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trans_reset transport_reset; /* transport device reset */
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proto_cmnd proto_handler; /* protocol handler */
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/* SCSI interfaces */
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struct scsi_cmnd *srb; /* current srb */
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unsigned int tag; /* current dCBWTag */
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/* control and bulk communications data */
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struct urb *current_urb; /* USB requests */
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struct usb_ctrlrequest *cr; /* control requests */
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struct usb_sg_request current_sg; /* scatter-gather req. */
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unsigned char *iobuf; /* I/O buffer */
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dma_addr_t cr_dma; /* buffer DMA addresses */
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dma_addr_t iobuf_dma;
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struct task_struct *ctl_thread; /* the control thread */
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/* mutual exclusion and synchronization structures */
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struct completion cmnd_ready; /* to sleep thread on */
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struct completion notify; /* thread begin/end */
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wait_queue_head_t delay_wait; /* wait during scan, reset */
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struct completion scanning_done; /* wait for scan thread */
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/* subdriver information */
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void *extra; /* Any extra data */
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extra_data_destructor extra_destructor;/* extra data destructor */
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#ifdef CONFIG_PM
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pm_hook suspend_resume_hook;
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#endif
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/* hacks for READ CAPACITY bug handling */
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int use_last_sector_hacks;
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int last_sector_retries;
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};
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/* Convert between us_data and the corresponding Scsi_Host */
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static inline struct Scsi_Host *us_to_host(struct us_data *us) {
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return container_of((void *) us, struct Scsi_Host, hostdata);
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}
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static inline struct us_data *host_to_us(struct Scsi_Host *host) {
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return (struct us_data *) host->hostdata;
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}
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/* Function to fill an inquiry response. See usb.c for details */
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extern void fill_inquiry_response(struct us_data *us,
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unsigned char *data, unsigned int data_len);
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/* The scsi_lock() and scsi_unlock() macros protect the sm_state and the
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* single queue element srb for write access */
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#define scsi_unlock(host) spin_unlock_irq(host->host_lock)
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#define scsi_lock(host) spin_lock_irq(host->host_lock)
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#endif
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