From: Eric Lapuyade <eric.lapuyade@xxxxxxxxx>
The semantics for a zero target found event is that the polling operation
could not complete.
Signed-off-by: Eric Lapuyade <eric.lapuyade@xxxxxxxxx>
Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
---
net/nfc/core.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 94ccf07..749ee48 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -560,6 +560,8 @@ EXPORT_SYMBOL(nfc_alloc_recv_skb);
* The device driver must call this function when one or many nfc targets
* are found. After calling this function, the device driver must stop
* polling for targets.
+ * NOTE: This function can be called with targets=NULL and n_targets=0 to
+ * notify a driver error, meaning that the polling operation cannot complete.
* IMPORTANT: this function must not be called from an atomic context.
* In addition, it must also not be called from a context that would prevent
* the NFC Core to call other nfc ops entry point concurrently.
@@ -586,13 +588,18 @@ int nfc_targets_found(struct nfc_dev *dev,
dev->targets_generation++;
kfree(dev->targets);
- dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
- GFP_ATOMIC);
+ dev->targets = NULL;
- if (!dev->targets) {
- dev->n_targets = 0;
- device_unlock(&dev->dev);
- return -ENOMEM;
+ if (targets) {
+ dev->targets = kmemdup(targets,
+ n_targets * sizeof(struct nfc_target),
+ GFP_ATOMIC);
+
+ if (!dev->targets) {
+ dev->n_targets = 0;
+ device_unlock(&dev->dev);
+ return -ENOMEM;
+ }
}
dev->n_targets = n_targets;
--
1.7.10
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