[PATCH] gpu/ipu-v3:reduce protected code area in ipu idmac get/put

[Bernard Zhao]

This change will speed-up a bit these ipu_idmac_get &
ipu_idmac_put processing and there is no need to protect
kzalloc & kfree.

Signed-off-by: Bernard Zhao <bern...@vivo.com>
---
 drivers/gpu/ipu-v3/ipu-common.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index b3dae9ec1a38..8b3a57864c2e 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -267,29 +267,30 @@ EXPORT_SYMBOL_GPL(ipu_rot_mode_to_degrees);
 struct ipuv3_channel *ipu_idmac_get(struct ipu_soc *ipu, unsigned num)
 {
        struct ipuv3_channel *channel;
+       struct ipuv3_channel *entry;
 
        dev_dbg(ipu->dev, "%s %d\n", __func__, num);
 
        if (num > 63)
                return ERR_PTR(-ENODEV);
 
+       channel = kzalloc(sizeof(*channel), GFP_KERNEL);
+       if (!channel)
+               return ERR_PTR(-ENOMEM);
+
+       channel->num = num;
+       channel->ipu = ipu;
+
        mutex_lock(&ipu->channel_lock);
 
-       list_for_each_entry(channel, &ipu->channels, list) {
-               if (channel->num == num) {
+       list_for_each_entry(entry, &ipu->channels, list) {
+               if (entry->num == num) {
+                       kfree(channel);
                        channel = ERR_PTR(-EBUSY);
                        goto out;
                }
        }
 
-       channel = kzalloc(sizeof(*channel), GFP_KERNEL);
-       if (!channel) {
-               channel = ERR_PTR(-ENOMEM);
-               goto out;
-       }
-
-       channel->num = num;
-       channel->ipu = ipu;
        list_add(&channel->list, &ipu->channels);
 
 out:
@@ -308,9 +309,10 @@ void ipu_idmac_put(struct ipuv3_channel *channel)
        mutex_lock(&ipu->channel_lock);
 
        list_del(&channel->list);
-       kfree(channel);
 
        mutex_unlock(&ipu->channel_lock);
+
+       kfree(channel);
 }
 EXPORT_SYMBOL_GPL(ipu_idmac_put);
 
-- 
2.28.0