From 316a4d966cae3c2dec83ebb1ee1a3515f97b30ff Mon Sep 17 00:00:00 2001 From: Larry Finger Date: Mon, 23 Nov 2009 18:42:36 -0600 Subject: b43legacy: avoid PPC fault during resume For PPC architecture with PHY Revision < 3, a read of the register B43_MMIO_HWENABLED_LO will cause a CPU fault unless b43legacy_status() returns a value of 2 (B43legacy_STAT_STARTED); however, one finds that the driver is unable to associate after resuming from hibernation unless this routine returns 1. To satisfy both conditions, the routine is rewritten to return TRUE whenever b43legacy_status() returns a value < 2. This patch fixes the second problem listed in the postings for Red Hat Bugzilla #538523. Signed-off-by: Larry Finger Cc: Stable Signed-off-by: John W. Linville --- drivers/net/wireless/b43legacy/rfkill.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/net/wireless/b43legacy') diff --git a/drivers/net/wireless/b43legacy/rfkill.c b/drivers/net/wireless/b43legacy/rfkill.c index 8783022db11e..d579df72b783 100644 --- a/drivers/net/wireless/b43legacy/rfkill.c +++ b/drivers/net/wireless/b43legacy/rfkill.c @@ -34,6 +34,13 @@ bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev) & B43legacy_MMIO_RADIO_HWENABLED_HI_MASK)) return 1; } else { + /* To prevent CPU fault on PPC, do not read a register + * unless the interface is started; however, on resume + * for hibernation, this routine is entered early. When + * that happens, unconditionally return TRUE. + */ + if (b43legacy_status(dev) < B43legacy_STAT_STARTED) + return 1; if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO) & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK) return 1; -- cgit v1.2.3