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Fix USB storage hang on command abort

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Okay, I found the cause of the hang.  It is a simple bug in the USB
scatter-gather library, caused by changes added in response to the S-G
chaining modification.

This patch (as1125) fixes a bug in the USB scatter-gather library.
Early exit from the S-G initialization loop does not reset the count of
outstanding URBs.

Signed-off-by: Alan Stern <[email protected]>
Cc: Matthew Dharm <[email protected]>
Cc: David Brownell <[email protected]>
Cc: Alan Jenkins <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alan Stern 2008-08-05 13:05:17 -04:00 • committed by Linus Torvalds
commit 580da34847
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/core/message.c
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@ -389,7 +389,6 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
if (io->entries <= 0)
return io->entries;
io->count = io->entries;
io->urbs = kmalloc(io->entries * sizeof *io->urbs, mem_flags);
if (!io->urbs)
goto nomem;
@ -458,6 +457,7 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT;
/* transaction state */
io->count = io->entries;
io->status = 0;
io->bytes = 0;
init_completion(&io->complete);