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authorAnton Vorontsov <avorontsov@ru.mvista.com>2010-01-18 05:37:16 +0000
committerDavid S. Miller <davem@davemloft.net>2010-01-19 01:59:02 -0800
commit4f9c85a1b03bfa5c0a0d8488a3a7766f3c9fb756 (patch)
tree33e56a2d442274aeb0baa2f2b61f7bb5759dd17b /drivers/net/phy/phy_device.c
parentde4ef86cfce60d2250111f34f8a084e769f23b16 (diff)
downloadlinux-linaro-android-4f9c85a1b03bfa5c0a0d8488a3a7766f3c9fb756.tar.gz
phylib: Move workqueue initialization to a proper place
commit 541cd3ee00a4fe975b22fac6a3bc846bacef37f7 ("phylib: Fix deadlock on resume") caused TI DaVinci EMAC ethernet driver to oops upon resume: PM: resume of devices complete after 237.098 msecs Restarting tasks ... done. kernel BUG at kernel/workqueue.c:354! Unable to handle kernel NULL pointer dereference at virtual address 00000000 [...] Backtrace: [<c002c598>] (__bug+0x0/0x2c) from [<c0052a54>] (queue_delayed_work_on+0x74/0xf8) [<c00529e0>] (queue_delayed_work_on+0x0/0xf8) from [<c0052b30>] (queue_delayed_work+0x2c/0x30) The oops pops up because TI DaVinci EMAC driver detaches PHY on suspend and attaches it back on resume. Attaching makes phylib call phy_start_machine() that initializes a workqueue. On the other hand, PHY's resume routine will call phy_start_machine() again, and that will cause the oops since we just destroyed the already scheduled workqueue. This patch fixes the issue by moving workqueue initialization to phy_device_create(). p.s. We don't see this oops with ucc_geth and gianfar drivers because they perform a fine-grained suspend, i.e. they just stop the PHYs without detaching. Reported-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Tested-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/phy_device.c')
-rw-r--r--drivers/net/phy/phy_device.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 8212b2b9342..adbc0fded13 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -177,6 +177,7 @@ struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)
dev->state = PHY_DOWN;
mutex_init(&dev->lock);
+ INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
return dev;
}