/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void rose_heartbeat_expiry(unsigned long); static void rose_timer_expiry(unsigned long); static void rose_idletimer_expiry(unsigned long); void rose_start_heartbeat(struct sock *sk) { del_timer(&sk->sk_timer); sk->sk_timer.data = (unsigned long)sk; sk->sk_timer.function = &rose_heartbeat_expiry; sk->sk_timer.expires = jiffies + 5 * HZ; add_timer(&sk->sk_timer); } void rose_start_t1timer(struct sock *sk) { struct rose_sock *rose = rose_sk(sk); del_timer(&rose->timer); rose->timer.data = (unsigned long)sk; rose->timer.function = &rose_timer_expiry; rose->timer.expires = jiffies + rose->t1; add_timer(&rose->timer); } void rose_start_t2timer(struct sock *sk) { struct rose_sock *rose = rose_sk(sk); del_timer(&rose->timer); rose->timer.data = (unsigned long)sk; rose->timer.function = &rose_timer_expiry; rose->timer.expires = jiffies + rose->t2; add_timer(&rose->timer); } void rose_start_t3timer(struct sock *sk) { struct rose_sock *rose = rose_sk(sk); del_timer(&rose->timer); rose->timer.data = (unsigned long)sk; rose->timer.function = &rose_timer_expiry; rose->timer.expires = jiffies + rose->t3; add_timer(&rose->timer); } void rose_start_hbtimer(struct sock *sk) { struct rose_sock *rose = rose_sk(sk); del_timer(&rose->timer); rose->timer.data = (unsigned long)sk; rose->timer.function = &rose_timer_expiry; rose->timer.expires = jiffies + rose->hb; add_timer(&rose->timer); } void rose_start_idletimer(struct sock *sk) { struct rose_sock *rose = rose_sk(sk); del_timer(&rose->idletimer); if (rose->idle > 0) { rose->idletimer.data = (unsigned long)sk; rose->idletimer.function = &rose_idletimer_expiry; rose->idletimer.expires = jiffies + rose->idle; add_timer(&rose->idletimer); } } void rose_stop_heartbeat(struct sock *sk) { del_timer(&sk->sk_timer); } void rose_stop_timer(struct sock *sk) { del_timer(&rose_sk(sk)->timer); } void rose_stop_idletimer(struct sock *sk) { del_timer(&rose_sk(sk)->idletimer); } static void rose_heartbeat_expiry(unsigned long param) { struct sock *sk = (struct sock *)param; struct rose_sock *rose = rose_sk(sk); bh_lock_sock(sk); switch (rose->state) { case ROSE_STATE_0: /* Magic here: If we listen() and a new link dies before it is accepted() it isn't 'dead' so doesn't get removed. */ if (sock_flag(sk, SOCK_DESTROY) || (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) { bh_unlock_sock(sk); rose_destroy_socket(sk); return; } break; case ROSE_STATE_3: /* * Check for the state of the receive buffer. */ if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) && (rose->condition & ROSE_COND_OWN_RX_BUSY)) { rose->condition &= ~ROSE_COND_OWN_RX_BUSY; rose->condition &= ~ROSE_COND_ACK_PENDING; rose->vl = rose->vr; rose_write_internal(sk, ROSE_RR); rose_stop_timer(sk); /* HB */ break; } break; } rose_start_heartbeat(sk); bh_unlock_sock(sk); } static void rose_timer_expiry(unsigned long param) { struct sock *sk = (struct sock *)param; struct rose_sock *rose = rose_sk(sk); bh_lock_sock(sk); switch (rose->state) { case ROSE_STATE_1: /* T1 */ case ROSE_STATE_4: /* T2 */ rose_write_internal(sk, ROSE_CLEAR_REQUEST); rose->state = ROSE_STATE_2; rose_start_t3timer(sk); break; case ROSE_STATE_2: /* T3 */ rose->neighbour->use--; rose_disconnect(sk, ETIMEDOUT, -1, -1); break; case ROSE_STATE_3: /* HB */ if (rose->condition & ROSE_COND_ACK_PENDING) { rose->condition &= ~ROSE_COND_ACK_PENDING; rose_enquiry_response(sk); } break; } bh_unlock_sock(sk); } static void rose_idletimer_expiry(unsigned long param) { struct sock *sk = (struct sock *)param; bh_lock_sock(sk); rose_clear_queues(sk); rose_write_internal(sk, ROSE_CLEAR_REQUEST); rose_sk(sk)->state = ROSE_STATE_2; rose_start_t3timer(sk); sk->sk_state = TCP_CLOSE; sk->sk_err = 0; sk->sk_shutdown |= SEND_SHUTDOWN; if (!sock_flag(sk, SOCK_DEAD)) { sk->sk_state_change(sk); sock_set_flag(sk, SOCK_DEAD); } bh_unlock_sock(sk); } b415c25e92 (patch) treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/6lowpan/nhc_dest.c parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/6lowpan/nhc_dest.c')