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Date: Fri, 28 Aug 2020 19:08:07 -0700 From: Bernard Zhao <bernard@...o.com> To: Philipp Zabel <p.zabel@...gutronix.de>, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org Cc: opensource.kernel@...o.com, Bernard Zhao <bernard@...o.com> Subject: [PATCH] gpu/ipu-v3:reduce protected code area in ipu idmac get/put 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 <bernard@...o.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
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