[PATCH v3] dmaengine: loongson: Remove the dev_dbg() output

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

The %pK format modifier was meant for /proc kind of output, not general
printk output. Since commit ad67b74d2469d ("printk: hash addresses
printed with %p") pointers are hashed by default and the behaviour can
be controller by `hash_pointers' boot argument.
The policy on %p is to not introduce new ones.

The output in loongson2_cmc_dma_issue_pending() is the only dev_dbg()
output in the driver and is only output once the transfer is started.
There is no output issued by the driver if the transfer is completed, if
a follow-up transfer is started or if any of the other callbacks (such
as loongson2_cmc_dma_tx_status()) are invoked. This output does not look
essential.

Instead removing just the %pK output, remove the complete dev_dbg()
output from the driver.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---

On 2026-09-18 16:44:59 [-0500], Frank Li wrote:
> 
> please careful,
> 
> remove whole dev_dbg() when vchan_issue_pending() failure.
> 
> commit messesge should show why it is okay to remove dev_dbg() here.

Is the arguing now reasonable?

> Frank

v2…v3: https://lore.kernel.org/all/20260918201714.eFNI3VMq@linutronix.de/
  - Reword part of the commit message.

v1…v2: https://lore.kernel.org/all/20260918103409.UV4g2ON7@linutronix.de/
  - Update subject line (it is removed, not replaced).

 drivers/dma/loongson/loongson2-apb-cmc-dma.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/dma/loongson/loongson2-apb-cmc-dma.c b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
index 1c9a542edc859..27f8f7a5738d9 100644
--- a/drivers/dma/loongson/loongson2-apb-cmc-dma.c
+++ b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
@@ -337,7 +337,6 @@ static void loongson2_cmc_dma_issue_pending(struct dma_chan *chan)
 	guard(spinlock_irqsave)(&lchan->vchan.lock);
 
 	if (vchan_issue_pending(&lchan->vchan) && !lchan->desc) {
-		dev_dbg(chan2dev(lchan), "vchan %pK: issued\n", &lchan->vchan);
 		loongson2_cmc_dma_start_transfer(lchan);
 	}
 }
-- 
2.55.0