stmmac: Don't init ptp again when resume from suspend/hibernation

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Both stmmac_open() and stmmac_resume() call stmmac_hw_setup(), and
stmmac_hw_setup() call stmmac_init_ptp() unconditionally. However, only
stmmac_release() calls stmmac_release_ptp(). Since stmmac_suspend()
doesn't call stmmac_release_ptp(), stmmac_resume() also needn't call
stmmac_init_ptp().

This patch also fix a "scheduling while atomic" problem when resume
from suspend/hibernation. Because stmmac_init_ptp() will trigger
scheduling while stmmac_resume() hold a spinlock.

Callgraph of "scheduling while atomic":
stmmac_resume() --> stmmac_hw_setup() --> stmmac_init_ptp() -->
stmmac_ptp_register() --> ptp_clock_register() --> device_create() -->
device_create_groups_vargs() --> device_add() --> devtmpfs_create_node()
--> wait_for_common() --> schedule_timeout() --> __schedule()

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Huacai Chen 2014-12-19 22:38:18 +08:00 • committed by David S. Miller

parent da413eec72

commit fe13192911

1 changed files with 8 additions and 6 deletions

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14

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

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