From 33a2285d96b5e7b9500612ec623bf4313397bb53 Mon Sep 17 00:00:00 2001 From: Lin Ming Date: Fri, 6 Jul 2012 12:06:57 +0800 Subject: [SCSI] scsi_pm: set device runtime state before parent suspended There is a race in scsi_bus_resume_common when set device's runtime state to active after pm_runtime_put_sync(dev->parent). Parent device may have been suspended so pm_runtime_set_active(dev) will fail with -EBUSY. Signed-off-by: Lin Ming Acked-by: Alan Stern Signed-off-by: James Bottomley --- drivers/scsi/scsi_pm.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) (limited to 'drivers/scsi/scsi_pm.c') diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c index d4201ded3b22..dc0ad85853e2 100644 --- a/drivers/scsi/scsi_pm.c +++ b/drivers/scsi/scsi_pm.c @@ -76,23 +76,24 @@ static int scsi_bus_resume_common(struct device *dev) { int err = 0; - if (scsi_is_sdev_device(dev)) { - /* - * Parent device may have runtime suspended as soon as - * it is woken up during the system resume. - * - * Resume it on behalf of child. - */ - pm_runtime_get_sync(dev->parent); - err = scsi_dev_type_resume(dev); - pm_runtime_put_sync(dev->parent); - } + /* + * Parent device may have runtime suspended as soon as + * it is woken up during the system resume. + * + * Resume it on behalf of child. + */ + pm_runtime_get_sync(dev->parent); + if (scsi_is_sdev_device(dev)) + err = scsi_dev_type_resume(dev); if (err == 0) { pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); } + + pm_runtime_put_sync(dev->parent); + return err; } -- cgit v1.2.3