litmus2008.git - [ARCHIVE] Old LITMUS^RT 2008 version (for reference).

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author	Kirill Korotaev <dev@sw.ru>	2006-06-27 05:54:32 -0400
committer	Linus Torvalds <torvalds@g5.osdl.org>	2006-06-27 20:32:44 -0400
commit	efc30814a88bdbe2bfe4ac94de2eb089ad80bee3 (patch)
tree	1134d7ccda13c09cf426af0524c13633292eac5b /drivers/ide/arm/rapide.c
parent	cc94abfcbc9fed0048365ce1fb8dc81353408bf8 (diff)

[PATCH] sched: CPU hotplug race vs. set_cpus_allowed()

There is a race between set_cpus_allowed() and move_task_off_dead_cpu(). __migrate_task() doesn't report any err code, so task can be left on its runqueue if its cpus_allowed mask changed so that dest_cpu is not longer a possible target. Also, chaning cpus_allowed mask requires rq->lock being held. Signed-off-by: Kirill Korotaev <dev@openvz.org> Acked-By: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Diffstat (limited to 'drivers/ide/arm/rapide.c')

0 files changed, 0 insertions, 0 deletions

/* Broadcom B43 wireless driver Common PHY routines Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>, Copyright (c) 2005-2007 Stefano Brivio <stefano.brivio@polimi.it> Copyright (c) 2005-2008 Michael Buesch <m@bues.ch> Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org> Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch> 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. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "phy_common.h" #include "phy_g.h" #include "phy_a.h" #include "phy_n.h" #include "phy_lp.h" #include "phy_ht.h" #include "phy_lcn.h" #include "b43.h" #include "main.h" int b43_phy_allocate(struct b43_wldev *dev) { struct b43_phy *phy = &(dev->phy); int err; phy->ops = NULL; switch (phy->type) { case B43_PHYTYPE_A: phy->ops = &b43_phyops_a; break; case B43_PHYTYPE_G: phy->ops = &b43_phyops_g; break; case B43_PHYTYPE_N: #ifdef CONFIG_B43_PHY_N phy->ops = &b43_phyops_n; #endif break; case B43_PHYTYPE_LP: #ifdef CONFIG_B43_PHY_LP phy->ops = &b43_phyops_lp; #endif break; case B43_PHYTYPE_HT: #ifdef CONFIG_B43_PHY_HT phy->ops = &b43_phyops_ht; #endif break; case B43_PHYTYPE_LCN: #ifdef CONFIG_B43_PHY_LCN phy->ops = &b43_phyops_lcn; #endif break; } if (B43_WARN_ON(!phy->ops)) return -ENODEV; err = phy->ops->allocate(dev); if (err) phy->ops = NULL; return err; } void b43_phy_free(struct b43_wldev *dev) { dev->phy.ops->free(dev); dev->phy.ops = NULL; } int b43_phy_init(struct b43_wldev *dev) { struct b43_phy *phy = &dev->phy; const struct b43_phy_operations *ops = phy->ops; int err; phy->channel = ops->get_default_chan(dev); ops->software_rfkill(dev, false); err = ops->init(dev); if (err) { b43err(dev->wl, "PHY init failed\n"); goto err_block_rf; } /* Make sure to switch hardware and firmware (SHM) to * the default channel. */ err = b43_switch_channel(dev, ops->get_default_chan(dev)); if (err) { b43err(dev->wl, "PHY init: Channel switch to default failed\n"); goto err_phy_exit; } return 0; err_phy_exit: if (ops->exit) ops->exit(dev); err_block_rf: ops->software_rfkill(dev, true); return err; } void b43_phy_exit(struct b43_wldev *dev) { const struct b43_phy_operations *ops = dev->phy.ops; ops->software_rfkill(dev, true); if (ops->exit) ops->exit(dev); } bool b43_has_hardware_pctl(struct b43_wldev *dev) { if (!dev->phy.hardware_power_control) return 0; if (!dev->phy.ops->supports_hwpctl) return 0; return dev->phy.ops->supports_hwpctl(dev); } void b43_radio_lock(struct b43_wldev *dev) { u32 macctl; #if B43_DEBUG B43_WARN_ON(dev->phy.radio_locked); dev->phy.radio_locked = 1; #endif macctl = b43_read32(dev, B43_MMIO_MACCTL); macctl |= B43_MACCTL_RADIOLOCK; b43_write32(dev, B43_MMIO_MACCTL, macctl); /* Commit the write and wait for the firmware * to finish any radio register access. */ b43_read32(dev, B43_MMIO_MACCTL); udelay(10); } void b43_radio_unlock(struct b43_wldev *dev) { u32 macctl; #if B43_DEBUG B43_WARN_ON(!dev->phy.radio_locked); dev->phy.radio_locked = 0; #endif /* Commit any write */ b43_read16(dev, B43_MMIO_PHY_VER); /* unlock */ macctl = b43_read32(dev, B43_MMIO_MACCTL); macctl &= ~B43_MACCTL_RADIOLOCK; b43_write32(dev, B43_MMIO_MACCTL, macctl); } void b43_phy_lock(struct b43_wldev *dev) { #if B43_DEBUG B43_WARN_ON(dev->phy.phy_locked); dev->phy.phy_locked = 1; #endif B43_WARN_ON(dev->dev->core_rev < 3); if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP)) b43_power_saving_ctl_bits(dev, B43_PS_AWAKE); } void b43_phy_unlock(struct b43_wldev *dev) { #if B43_DEBUG B43_WARN_ON(!dev->phy.phy_locked); dev->phy.phy_locked = 0; #endif B43_WARN_ON(dev->dev->core_rev < 3); if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP)) b43_power_saving_ctl_bits(dev, 0); } static inline void assert_mac_suspended(struct b43_wldev *dev) { if (!B43_DEBUG) return; if ((b43_status(dev) >= B43_STAT_INITIALIZED) && (dev->mac_suspended <= 0)) { b43dbg(dev->wl, "PHY/RADIO register access with " "enabled MAC.\n"); dump_stack(); } } u16 b43_radio_read(struct b43_wldev *dev, u16 reg) { assert_mac_suspended(dev); return dev->phy.ops->radio_read(dev, reg); } void b43_radio_write(struct b43_wldev *dev, u16 reg, u16 value) { assert_mac_suspended(dev); dev->phy.ops->radio_write(dev, reg, value); } void b43_radio_mask(struct b43_wldev *dev, u16 offset, u16 mask) { b43_radio_write16(dev, offset, b43_radio_read16(dev, offset) & mask); } void b43_radio_set(struct b43_wldev *dev, u16 offset, u16 set) { b43_radio_write16(dev, offset, b43_radio_read16(dev, offset) | set); } void b43_radio_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set) { b43_radio_write16(dev, offset, (b43_radio_read16(dev, offset) & mask) | set); } u16 b43_phy_read(struct b43_wldev *dev, u16 reg) { assert_mac_suspended(dev); dev->phy.writes_counter = 0; return dev->phy.ops->phy_read(dev, reg); } void b43_phy_write(struct b43_wldev *dev, u16 reg, u16 value) { assert_mac_suspended(dev); dev->phy.ops->phy_write(dev, reg, value); if (++dev->phy.writes_counter == B43_MAX_WRITES_IN_ROW) { b43_read16(dev, B43_MMIO_PHY_VER); dev->phy.writes_counter = 0; } } void b43_phy_copy(struct b43_wldev *dev, u16 destreg, u16 srcreg) { assert_mac_suspended(dev); dev->phy.ops->phy_write(dev, destreg, dev->phy.ops->phy_read(dev, srcreg)); } void b43_phy_mask(struct b43_wldev *dev, u16 offset, u16 mask) { if (dev->phy.ops->phy_maskset) { assert_mac_suspended(dev); dev->phy.ops->phy_maskset(dev, offset, mask, 0); } else { b43_phy_write(dev, offset, b43_phy_read(dev, offset) & mask); } } void b43_phy_set(struct b43_wldev *dev, u16 offset, u16 set) { if (dev->phy.ops->phy_maskset) { assert_mac_suspended(dev); dev->phy.ops->phy_maskset(dev, offset, 0xFFFF, set); } else { b43_phy_write(dev, offset, b43_phy_read(dev, offset) | set); } } void b43_phy_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set) { if (dev->phy.ops->phy_maskset) { assert_mac_suspended(dev); dev->phy.ops->phy_maskset(dev, offset, mask, set); } else { b43_phy_write(dev, offset, (b43_phy_read(dev, offset) & mask) | set); } } int b43_switch_channel(struct b43_wldev *dev, unsigned int new_channel) { struct b43_phy *phy = &(dev->phy); u16 channelcookie, savedcookie;


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