staging: nvec: Have nvec_write_async() return -ENOMEM on OOM

Change nvec_write_async() to return an integer, 0 by default,
a negative error on failure. Change nvec_write_sync() to
check the return value and abort if it is negative.

Signed-off-by: Julian Andres Klode <jak@jak-linux.org>
Acked-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index fee4ee0..dc3c0c6 100644 (file)
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -154,13 +154,16 @@ static void nvec_gpio_set_value(struct nvec_chip *nvec, int value)
        gpio_set_value(nvec->gpio, value);
 }
 
-void nvec_write_async(struct nvec_chip *nvec, const unsigned char *data,
+int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data,
                        short size)
 {
        struct nvec_msg *msg;
        unsigned long flags;
 
        msg = nvec_msg_alloc(nvec);
+       if (msg == NULL)
+               return -ENOMEM;
+
        msg->data[0] = size;
        memcpy(msg->data + 1, data, size);
        msg->size = size + 1;
@@ -170,6 +173,8 @@ void nvec_write_async(struct nvec_chip *nvec, const unsigned char *data,
        spin_unlock_irqrestore(&nvec->tx_lock, flags);
 
        queue_work(nvec->wq, &nvec->tx_work);
+
+       return 0;
 }
 EXPORT_SYMBOL(nvec_write_async);
 
@@ -181,7 +186,9 @@ struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec,
        mutex_lock(&nvec->sync_write_mutex);
 
        nvec->sync_write_pending = (data[1] << 8) + data[0];
-       nvec_write_async(nvec, data, size);
+
+       if (nvec_write_async(nvec, data, size) < 0)
+               return NULL;
 
        dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n",
                                        nvec->sync_write_pending);

diff --git a/drivers/staging/nvec/nvec.h b/drivers/staging/nvec/nvec.h
index 851d783..a39cfc1 100644 (file)
--- a/drivers/staging/nvec/nvec.h
+++ b/drivers/staging/nvec/nvec.h
@@ -97,7 +97,7 @@ struct nvec_chip {
        int state;
 };
 
-extern void nvec_write_async(struct nvec_chip *nvec, const unsigned char *data,
+extern int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data,
                             short size);
 
 extern struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec,