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When spinlock debugging is turned on, a struct completion grows beyond the size allowed for the scsi_pointer. So move the struct completion back onto the stack. The additional memory barriers are to keep us from completing a random piece of kernel stack if the command happens to complete after the error handling has finished. Signed-off-by: Matthew Wilcox <matthew@wil.cx> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>