Messages in this thread Patch in this message | | | From | Julia Lawall <> | Subject | [PATCH 1/6] drivers/pci/hotplug/cpci_hotplug_core.c: ensure a consistent return value in error case | Date | Sat, 14 Jul 2012 18:43:03 +0200 |
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From: Julia Lawall <Julia.Lawall@lip6.fr>
Typically, the return value desired for the failure of a function with an integer return value is a negative integer. In these cases, the return value is sometimes a negative integer and sometimes 0, due to a subsequent initialization of the return variable within the loop.
A simplified version of the semantic match that finds this problem is: (http://coccinelle.lip6.fr/)
//<smpl> @r exists@ identifier ret; position p; constant C; expression e1,e3,e4; statement S; @@
ret = -C ... when != ret = e3 when any if@p (...) S ... when any if (\(ret != 0\|ret < 0\|ret > 0\) || ...) { ... return ...; } ... when != ret = e3 when any *if@p (...) { ... when != ret = e4 return ret; } //</smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
--- drivers/pci/hotplug/cpci_hotplug_core.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/hotplug/cpci_hotplug_core.c b/drivers/pci/hotplug/cpci_hotplug_core.c index 3fadf2f..2b4c412 100644 --- a/drivers/pci/hotplug/cpci_hotplug_core.c +++ b/drivers/pci/hotplug/cpci_hotplug_core.c @@ -225,7 +225,7 @@ cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last) struct hotplug_slot *hotplug_slot; struct hotplug_slot_info *info; char name[SLOT_NAME_SIZE]; - int status = -ENOMEM; + int status; int i; if (!(controller && bus)) @@ -237,18 +237,24 @@ cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last) */ for (i = first; i <= last; ++i) { slot = kzalloc(sizeof (struct slot), GFP_KERNEL); - if (!slot) + if (!slot) { + status = -ENOMEM; goto error; + } hotplug_slot = kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL); - if (!hotplug_slot) + if (!hotplug_slot) { + status = -ENOMEM; goto error_slot; + } slot->hotplug_slot = hotplug_slot; info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL); - if (!info) + if (!info) { + status = -ENOMEM; goto error_hpslot; + } hotplug_slot->info = info; slot->bus = bus;
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