[RFC 1/1] Driver Core: don't oops with unregistered driver in driver_find_device()

From: Hiroshi DOYU
Date: Thu May 10 2012 - 03:37:16 EST

driver_find_device() can be called with an unregistered driver. Need
to check driver_private to see if it's populated or not, especially
under deferrable probe.

Signed-off-by: Hiroshi DOYU <hdoyu@xxxxxxxxxx>
In [PATCHv5 2/3] ARM: tegra: Add SMMU enabler in AHB:

"tegra_ahb_driver" may not be populated when it's called.
drivers/base/driver.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 3ec3896..207c27d 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -80,7 +80,7 @@ struct device *driver_find_device(struct device_driver *drv,
struct klist_iter i;
struct device *dev;

- if (!drv)
+ if (!drv || !drv->p)
return NULL;

klist_iter_init_node(&drv->p->klist_devices, &i,

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/