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commitb1d353ad3dupstream. "count" is controlled by the user and it can be negative. Let's prevent that by making it unsigned. You have to have CAP_SYS_RAWIO to call this function so the bug is not as serious as it could be. Fixes:5369c02d95('intel_scu_ipc: Utility driver for intel scu ipc') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Darren Hart <dvhart@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>