re: IB/usnic: Add Cisco VIC low-level hardware driver

re: IB/usnic: Add Cisco VIC low-level hardware driver

[Dan Carpenter]

Hello Upinder Malhi,

The patch b1819c455542: "IB/usnic: Add Cisco VIC low-level hardware
driver" from Sep 10, 2013, leads to the following Smatch
warning:

	drivers/infiniband/hw/usnic/usnic_uiom.c:560
	usnic_uiom_get_dev_list()
	error: scheduling with locks held: 'spin_lock:lock'

drivers/infiniband/hw/usnic/usnic_uiom.c
   553  struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd)
   554  {
   555          struct usnic_uiom_dev *uiom_dev;
   556          struct device **devs;
   557          int i = 0;
   558  
   559          spin_lock(&pd->lock);
   560          devs = kzalloc(sizeof(*devs)*(pd->dev_cnt + 1), GFP_KERNEL);
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
You can't do blocking allocations with a spin_lock held.

   561          if (!devs) {
   562                  devs = ERR_PTR(-ENOMEM);
   563                  goto out;
   564          }

regards,
dan carpenter

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[patch] IB/usnic: use GFP_ATOMIC under spinlock

[Dan Carpenter]

This is called from qp_grp_and_vf_bind() and we are holding the
"vf->lock" so the allocation can't sleep.

Fixes: e3cf00d0a87f ('IB/usnic: Add Cisco VIC low-level hardware driver')
Signed-off-by: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>

diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c
index ae6934c0d05a..16755cdab2c0 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom.c
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
@@ -498,7 +498,7 @@ int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev)
 	struct usnic_uiom_dev *uiom_dev;
 	int err;
 
-	uiom_dev = kzalloc(sizeof(*uiom_dev), GFP_KERNEL);
+	uiom_dev = kzalloc(sizeof(*uiom_dev), GFP_ATOMIC);
 	if (!uiom_dev)
 		return -ENOMEM;
 	uiom_dev->dev = dev;
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