[PATCH 3.16.y-ckt 36/71] net: dp83640: reinforce locking rules.
From: Luis Henriques <hidden>
Date: 2015-06-25 10:15:44
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Subsystem:
ethernet phy library, networking drivers, ptp hardware clock support, the rest · Maintainers:
Andrew Lunn, Heiner Kallweit, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Richard Cochran, Linus Torvalds
3.16.7-ckt14 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Richard Cochran <richardcochran@gmail.com> commit a935865c828c8cd20501f618c69f659a5b6d6a5f upstream. Callers of the ext_write function are supposed to hold a mutex that protects the state of the dialed page, but one caller was missing the lock from the very start, and over time the code has been changed without following the rule. This patch cleans up the call sites in violation of the rule. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Luis Henriques <redacted> --- drivers/net/phy/dp83640.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 4452bbe97a1d..a6fd0d8f4128 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c@@ -487,7 +487,9 @@ static int ptp_dp83640_enable(struct ptp_clock_info *ptp, else evnt |= EVNT_RISE; } + mutex_lock(&clock->extreg_lock); ext_write(0, phydev, PAGE5, PTP_EVNT, evnt); + mutex_unlock(&clock->extreg_lock); return 0; case PTP_CLK_REQ_PEROUT:
@@ -513,6 +515,8 @@ static u8 status_frame_src[6] = { 0x08, 0x00, 0x17, 0x0B, 0x6B, 0x0F }; static void enable_status_frames(struct phy_device *phydev, bool on) { + struct dp83640_private *dp83640 = phydev->priv; + struct dp83640_clock *clock = dp83640->clock; u16 cfg0 = 0, ver; if (on)
@@ -520,9 +524,13 @@ static void enable_status_frames(struct phy_device *phydev, bool on) ver = (PSF_PTPVER & VERSIONPTP_MASK) << VERSIONPTP_SHIFT; + mutex_lock(&clock->extreg_lock); + ext_write(0, phydev, PAGE5, PSF_CFG0, cfg0); ext_write(0, phydev, PAGE6, PSF_CFG1, ver); + mutex_unlock(&clock->extreg_lock); + if (!phydev->attached_dev) { pr_warn("expected to find an attached netdevice\n"); return;
@@ -1127,11 +1135,18 @@ static int dp83640_config_init(struct phy_device *phydev) if (clock->chosen && !list_empty(&clock->phylist)) recalibrate(clock); - else + else { + mutex_lock(&clock->extreg_lock); enable_broadcast(phydev, clock->page, 1); + mutex_unlock(&clock->extreg_lock); + } enable_status_frames(phydev, true); + + mutex_lock(&clock->extreg_lock); ext_write(0, phydev, PAGE4, PTP_CTL, PTP_ENABLE); + mutex_unlock(&clock->extreg_lock); + return 0; }