Author: zbb Date: Tue May 30 11:55:02 2017 New Revision: 319198 URL: https://svnweb.freebsd.org/changeset/base/319198
Log: Add locks before each ena_up and ena_down Lock only ena_up and ena_down calls in ioctl handler, instead of whole ioctl. Locking ioctl with sx lock that is sleepable, is not allowed in some cases, e.g. when multicast options are being changed. Additional locking was added in deatch function to prevent race condition with ioctl function. Submitted by: Michal Krawczyk <m...@semihalf.com> Obtained from: Semihalf Sponsored by: Amazon.com Inc. Differential revision: https://reviews.freebsd.org/D10924 Modified: head/sys/dev/ena/ena.c Modified: head/sys/dev/ena/ena.c ============================================================================== --- head/sys/dev/ena/ena.c Tue May 30 11:53:18 2017 (r319197) +++ head/sys/dev/ena/ena.c Tue May 30 11:55:02 2017 (r319198) @@ -2285,16 +2285,16 @@ ena_ioctl(if_t ifp, u_long command, caddr_t data) /* * Acquiring lock to prevent from running up and down routines parallel. */ - sx_xlock(&adapter->ioctl_sx); - rc = 0; switch (command) { case SIOCSIFMTU: + sx_xlock(&adapter->ioctl_sx); ena_down(adapter); ena_change_mtu(ifp, ifr->ifr_mtu); rc = ena_up(adapter); + sx_unlock(&adapter->ioctl_sx); break; case SIOCSIFFLAGS: @@ -2306,11 +2306,16 @@ ena_ioctl(if_t ifp, u_long command, caddr_t data) "ioctl promisc/allmulti\n"); } } else { + sx_xlock(&adapter->ioctl_sx); rc = ena_up(adapter); + sx_unlock(&adapter->ioctl_sx); } } else { - if (ifp->if_drv_flags & IFF_DRV_RUNNING) + if (ifp->if_drv_flags & IFF_DRV_RUNNING) { + sx_xlock(&adapter->ioctl_sx); ena_down(adapter); + sx_unlock(&adapter->ioctl_sx); + } } break; @@ -2333,8 +2338,10 @@ ena_ioctl(if_t ifp, u_long command, caddr_t data) } if (reinit && (ifp->if_drv_flags & IFF_DRV_RUNNING)) { + sx_xlock(&adapter->ioctl_sx); ena_down(adapter); rc = ena_up(adapter); + sx_unlock(&adapter->ioctl_sx); } } @@ -2344,8 +2351,6 @@ ena_ioctl(if_t ifp, u_long command, caddr_t data) break; } - sx_unlock(&adapter->ioctl_sx); - return (rc); } @@ -3666,7 +3671,9 @@ ena_detach(device_t pdev) taskqueue_drain(adapter->reset_tq, &adapter->reset_task); taskqueue_free(adapter->reset_tq); + sx_xlock(&adapter->ioctl_sx); ena_down(adapter); + sx_unlock(&adapter->ioctl_sx); if (adapter->ifp != NULL) { ether_ifdetach(adapter->ifp); _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
