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    Contents of /trunk/kernel26-alx/patches-2.6.29-r1/0310-2.6.29-fix-scsi-issues.patch

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    Revision 876 - (show annotations) (download)
    Wed Aug 5 13:52:01 2009 UTC (14 years, 9 months ago) by niro
    File size: 5533 byte(s) 
    *** empty log message ***
    1 On Sun, 2008-05-04 at 09:34 -0500, James Bottomley wrote:
    2 > On Sat, 2008-05-03 at 17:22 -0700, bugme-daemon@bugzilla.kernel.org
    3 > wrote:
    4 > > http://bugzilla.kernel.org/show_bug.cgi?id=9872
    5 >
    6 > This isn't a bug. There have been numerous discussions about fixing it.
    7
    8 It is a kind of a "bug". The core does not call driver functions, if
    9 bus_type is provided. So the warning is fine according to the current
    10 logic of the core, telling you it will ignore things a driver asked for.
    11
    12 > The warning comes out of here in drivers/base/driver.c:
    13 >
    14 > if ((drv->bus->probe && drv->probe) ||
    15 > (drv->bus->remove && drv->remove) ||
    16 > (drv->bus->shutdown && drv->shutdown))
    17 > printk(KERN_WARNING "Driver '%s' needs updating - please use "
    18 > "bus_type methods\n", drv->name);
    19 >
    20 > The problem is that SCSI drivers have both: SCSI uses the bus methods to
    21 > trigger the probe and remove (as it must having a bus method) but it
    22 > also uses the individual struct driver probe and remove methods to
    23 > rethrow the events to the ULDs.
    24
    25 Looks like it does not use probe() on the bus. Now lets get rid of
    26 remove(). :)
    27
    28 > According to Kay and Greg, this is a legitimate way of operating, and
    29 > they're not going to remove the driver methods (otherwise we'd just take
    30 > them into struct scsi_driver), so we're stuck trying to find a way to
    31 > prevent the base warning about this.
    32
    33 Right, I guess, they are not going away, but you still should only use
    34 one of them, and not both at the same time.
    35
    36 How about the following patch? Which does not use driver core pointers,
    37 which are ignored by the core, to do private SCSI stuff.
    38
    39 Thanks,
    40 Kay
    41
    42
    43
    44 From: Hannes Reinecke <hare@suse.de>
    45 Subject: SCSI: do not use bus_type->remove() and driver->remove() at the same
    46 time
    47
    48 If a driver sets blk_queue_prep_rq(), it should clean it up itself, and
    49 not from the bus callbacks. This removes the need to hook into bus->remove(),
    50 which should not be used at the same time as driver->remove().
    51
    52 Signed-off-by: Hannes Reinecke <hare@suse.de>
    53 Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
    54 ---
    55
    56 drivers/scsi/scsi_lib.c | 1 +
    57 drivers/scsi/scsi_priv.h | 1 -
    58 drivers/scsi/scsi_sysfs.c | 17 -----------------
    59 drivers/scsi/sd.c | 2 ++
    60 drivers/scsi/sr.c | 1 +
    61 include/scsi/scsi_driver.h | 1 +
    62 6 files changed, 5 insertions(+), 18 deletions(-)
    63
    64 diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
    65 index a82d2fe..16d21d2 100644
    66 --- a/drivers/scsi/scsi_lib.c
    67 +++ b/drivers/scsi/scsi_lib.c
    68 @@ -1267,6 +1267,7 @@ int scsi_prep_fn(struct request_queue *q, struct request
    69 *req)
    70 ret = scsi_setup_blk_pc_cmnd(sdev, req);
    71 return scsi_prep_return(q, req, ret);
    72 }
    73 +EXPORT_SYMBOL(scsi_prep_fn);
    74
    75 /*
    76 * scsi_dev_queue_ready: if we can send requests to sdev, return 1 else
    77 diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
    78 index b33e725..8dd1e3b 100644
    79 --- a/drivers/scsi/scsi_priv.h
    80 +++ b/drivers/scsi/scsi_priv.h
    81 @@ -76,7 +76,6 @@ extern int scsi_init_queue(void);
    82 extern void scsi_exit_queue(void);
    83 struct request_queue;
    84 struct request;
    85 -extern int scsi_prep_fn(struct request_queue *, struct request *);
    86
    87 /* scsi_proc.c */
    88 #ifdef CONFIG_SCSI_PROC_FS
    89 diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
    90 index 049103f..ad0b88b 100644
    91 --- a/drivers/scsi/scsi_sysfs.c
    92 +++ b/drivers/scsi/scsi_sysfs.c
    93 @@ -410,29 +410,12 @@ static int scsi_bus_resume(struct device * dev)
    94 return err;
    95 }
    96
    97 -static int scsi_bus_remove(struct device *dev)
    98 -{
    99 - struct device_driver *drv = dev->driver;
    100 - struct scsi_device *sdev = to_scsi_device(dev);
    101 - int err = 0;
    102 -
    103 - /* reset the prep_fn back to the default since the
    104 - * driver may have altered it and it's being removed */
    105 - blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
    106 -
    107 - if (drv && drv->remove)
    108 - err = drv->remove(dev);
    109 -
    110 - return 0;
    111 -}
    112 -
    113 struct bus_type scsi_bus_type = {
    114 .name = "scsi",
    115 .match = scsi_bus_match,
    116 .uevent = scsi_bus_uevent,
    117 .suspend = scsi_bus_suspend,
    118 .resume = scsi_bus_resume,
    119 - .remove = scsi_bus_remove,
    120 };
    121
    122 int scsi_sysfs_register(void)
    123 diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
    124 index 01cefbb..672a17a 100644
    125 --- a/drivers/scsi/sd.c
    126 +++ b/drivers/scsi/sd.c
    127 @@ -1743,6 +1743,8 @@ static int sd_remove(struct device *dev)
    128 {
    129 struct scsi_disk *sdkp = dev_get_drvdata(dev);
    130
    131 + blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
    132 +
    133 device_del(&sdkp->dev);
    134 del_gendisk(sdkp->disk);
    135 sd_shutdown(dev);
    136 diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
    137 index 7ee86d4..5860dc7 100644
    138 --- a/drivers/scsi/sr.c
    139 +++ b/drivers/scsi/sr.c
    140 @@ -901,6 +901,7 @@ static int sr_remove(struct device *dev)
    141 {
    142 struct scsi_cd *cd = dev_get_drvdata(dev);
    143
    144 + blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
    145 del_gendisk(cd->disk);
    146
    147 mutex_lock(&sr_ref_mutex);
    148 diff --git a/include/scsi/scsi_driver.h b/include/scsi/scsi_driver.h
    149 index 1f5ca7f..9fd6702 100644
    150 --- a/include/scsi/scsi_driver.h
    151 +++ b/include/scsi/scsi_driver.h
    152 @@ -32,5 +32,6 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct
    153 request *req);
    154 int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req);
    155 int scsi_prep_state_check(struct scsi_device *sdev, struct request *req);
    156 int scsi_prep_return(struct request_queue *q, struct request *req, int ret);
    157 +int scsi_prep_fn(struct request_queue *, struct request *);
    158
    159 #endif /* _SCSI_SCSI_DRIVER_H */