MPTCTL_SYSCALL_DOWN(9)                Message-based devices                MPTCTL_SYSCALL_DOWN(9)



NAME
       mptctl_syscall_down - Down the MPT adapter syscall semaphore.

SYNOPSIS
       int mptctl_syscall_down(MPT_ADAPTER * ioc, int nonblock);

ARGUMENTS
       ioc
           Pointer to MPT adapter

       nonblock
           boolean, non-zero if O_NONBLOCK is set

DESCRIPTION
       All of the ioctl commands can potentially sleep, which is illegal with a spinlock held,
       thus we perform mutual exclusion here.

       Returns negative errno on error, or zero for success.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                    MPTCTL_SYSCALL_DOWN(9)