diff options
| author |   Doug Maxey <dwm@enoyolf.org> | 2007-12-05 23:36:45 -0600 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2007-12-17 10:47:14 -0800 |
| commit | 33abc04f0420dceed0ebc2d1094019d3bb2b5c29 (patch) | |
| tree | 87d8e2c7cf41d6afed4d75c2e3ef113b506541ab /drivers/usb | |
| parent | USB: sierra: fix product id (diff) | |
| download | linux-dev-33abc04f0420dceed0ebc2d1094019d3bb2b5c29.tar.xz linux-dev-33abc04f0420dceed0ebc2d1094019d3bb2b5c29.zip | |
usb-storage: Fix devices that cannot handle 32k transfers
When a device cannot handle the smallest previously limited transfer
size (64 blocks) without stalling, limit the device to the amount of
packets that fit in a platform native page.
The lowest possible limit is PAGE_CACHE_SIZE, so if the device is ever
used on a platform that has larger than 8K pages, you lose unless you
can convince the device firmware folks to fix the issue.
Cc: Mathew Dharm <mdharm-scsi@one-eyed-alien.net>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Doug Maxey <dwm@austin.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/storage/scsiglue.c | 12 | ||||
| -rw-r--r-- | drivers/usb/storage/unusual_devs.h | 7 |
2 files changed, 16 insertions, 3 deletions
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c index 836a34ae6ec6..7c9593b7b04e 100644 --- a/drivers/usb/storage/scsiglue.c +++ b/drivers/usb/storage/scsiglue.c @@ -114,9 +114,15 @@ static int slave_configure(struct scsi_device *sdev) * while others have trouble with more than 64K. At this time we * are limiting both to 32K (64 sectores). */ - if ((us->flags & US_FL_MAX_SECTORS_64) && - sdev->request_queue->max_sectors > 64) - blk_queue_max_sectors(sdev->request_queue, 64); + if (us->flags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) { + unsigned int max_sectors = 64; + + if (us->flags & US_FL_MAX_SECTORS_MIN) + max_sectors = PAGE_CACHE_SIZE >> 9; + if (sdev->request_queue->max_sectors > max_sectors) + blk_queue_max_sectors(sdev->request_queue, + max_sectors); + } /* We can't put these settings in slave_alloc() because that gets * called before the device type is known. Consequently these diff --git a/drivers/usb/storage/unusual_devs.h b/drivers/usb/storage/unusual_devs.h index 2c27721bd259..7bbfd31a9645 100644 --- a/drivers/usb/storage/unusual_devs.h +++ b/drivers/usb/storage/unusual_devs.h @@ -376,6 +376,13 @@ UNUSUAL_DEV( 0x04b0, 0x0417, 0x0100, 0x0100, US_SC_DEVICE, US_PR_DEVICE, NULL, US_FL_FIX_CAPACITY), +/* Reported by Doug Maxey (dwm@austin.ibm.com) */ +UNUSUAL_DEV( 0x04b3, 0x4001, 0x0110, 0x0110, + "IBM", + "IBM RSA2", + US_SC_DEVICE, US_PR_CB, NULL, + US_FL_MAX_SECTORS_MIN), + /* BENQ DC5330 * Reported by Manuel Fombuena <mfombuena@ya.com> and * Frank Copeland <fjc@thingy.apana.org.au> */ |