[Xen-devel] [PATCH] xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL in pcistub_reg_add

[Jia-Ju Bai <baijiaju1990@xxxxxxxxx>]

pcistub_reg_add() is never called in atomic context.

pcistub_reg_add() is only called by pcistub_quirk_add, which is 
only set in DRIVER_ATTR().

Despite never getting called from atomic context,
pcistub_reg_add() calls kzalloc() with GFP_ATOMIC,
which does not sleep for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
which can sleep and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
---
 drivers/xen/xen-pciback/pci_stub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/xen-pciback/pci_stub.c 
b/drivers/xen/xen-pciback/pci_stub.c
index 9e480fd..9d92bed 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -1149,7 +1149,7 @@ static int pcistub_reg_add(int domain, int bus, int slot, 
int func,
        }
        dev = psdev->dev;
 
-       field = kzalloc(sizeof(*field), GFP_ATOMIC);
+       field = kzalloc(sizeof(*field), GFP_KERNEL);
        if (!field) {
                err = -ENOMEM;
                goto out;
-- 
1.9.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel