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authorAlan Stern <stern@rowland.harvard.edu>2008-05-08 11:55:59 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-07-21 15:15:54 -0700
commit543f7810fba2a62e412efa9473ad08167b691f09 (patch)
tree4e29d5b264b44ed544ea4fa6aec3389c504e9b68 /drivers/usb/storage/usb.h
parent9da82bd4649334817ef0e752a69eb99051645dad (diff)
usb-storage: implement "soft" unbinding
This patch (as1092) implements "soft" unbinding for usb-storage. When the disconnect routine is called, all commands and reset delays are allowed to complete normally until after scsi_remove_host() returns. This means that the commands needed for an orderly shutdown will be sent through to the device. Unlike before, the driver will now execute every command that it accepts. Hence there's no need for special code to catch unexecuted commands and fail them. The new sequence of events when disconnect runs goes as follows: If the device is truly unplugged, set the DISCONNECTING flag so we won't try to access it any more. If the SCSI-scanning thread hasn't started up yet, prevent it from doing anything by setting the new DONT_SCAN flag. Then wake it up and wait for it to terminate. Remove the SCSI host. This unbinds the upper-level drivers, doing an orderly shutdown. Commands sent to quiesce the device will be transmitted normally, unless the device is unplugged. Set the DISCONNECTING flag so that we won't accept any new commands that might get submitted (there aren't supposed to be any) and we won't try to access the device for resets. Tell the control thread to exit by waking it up with no pending command, and wait for it to terminate. Go on to do all the other normal stuff: releasing resources, freeing memory, and so on. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/storage/usb.h')
-rw-r--r--drivers/usb/storage/usb.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/usb/storage/usb.h b/drivers/usb/storage/usb.h
index 8da96da5875..47906dc620d 100644
--- a/drivers/usb/storage/usb.h
+++ b/drivers/usb/storage/usb.h
@@ -72,11 +72,9 @@ struct us_unusual_dev {
#define US_FLIDX_SG_ACTIVE 1 /* current_sg is in use */
#define US_FLIDX_ABORTING 2 /* abort is in progress */
#define US_FLIDX_DISCONNECTING 3 /* disconnect in progress */
-#define ABORTING_OR_DISCONNECTING ((1UL << US_FLIDX_ABORTING) | \
- (1UL << US_FLIDX_DISCONNECTING))
#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 USB_STOR_STRING_LEN 32