FAILED: patch "[PATCH] soundwire: fix enumeration completion" failed to apply to 5.15-stable tree

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The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x c40d6b3249b11d60e09d81530588f56233d9aa44
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '2023080127-unquote-heaviness-e2c5@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

c40d6b3249b1 ("soundwire: fix enumeration completion")
e557bca49b81 ("soundwire: bus: pm_runtime_request_resume on peripheral attachment")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From c40d6b3249b11d60e09d81530588f56233d9aa44 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan+linaro@xxxxxxxxxx>
Date: Wed, 5 Jul 2023 14:30:11 +0200
Subject: [PATCH] soundwire: fix enumeration completion

The soundwire subsystem uses two completion structures that allow
drivers to wait for soundwire device to become enumerated on the bus and
initialised by their drivers, respectively.

The code implementing the signalling is currently broken as it does not
signal all current and future waiters and also uses the wrong
reinitialisation function, which can potentially lead to memory
corruption if there are still waiters on the queue.

Not signalling future waiters specifically breaks sound card probe
deferrals as codec drivers can not tell that the soundwire device is
already attached when being reprobed. Some codec runtime PM
implementations suffer from similar problems as waiting for enumeration
during resume can also timeout despite the device already having been
enumerated.

Fixes: fb9469e54fa7 ("soundwire: bus: fix race condition with enumeration_complete signaling")
Fixes: a90def068127 ("soundwire: bus: fix race condition with initialization_complete signaling")
Cc: stable@xxxxxxxxxxxxxxx      # 5.7
Cc: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Cc: Rander Wang <rander.wang@xxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230705123018.30903-2-johan+linaro@xxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index dba920ec88f6..cf78839b3f74 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -922,8 +922,8 @@ static void sdw_modify_slave_status(struct sdw_slave *slave,
 			"initializing enumeration and init completion for Slave %d\n",
 			slave->dev_num);
 
-		init_completion(&slave->enumeration_complete);
-		init_completion(&slave->initialization_complete);
+		reinit_completion(&slave->enumeration_complete);
+		reinit_completion(&slave->initialization_complete);
 
 	} else if ((status == SDW_SLAVE_ATTACHED) &&
 		   (slave->status == SDW_SLAVE_UNATTACHED)) {
@@ -931,7 +931,7 @@ static void sdw_modify_slave_status(struct sdw_slave *slave,
 			"signaling enumeration completion for Slave %d\n",
 			slave->dev_num);
 
-		complete(&slave->enumeration_complete);
+		complete_all(&slave->enumeration_complete);
 	}
 	slave->status = status;
 	mutex_unlock(&bus->bus_lock);
@@ -1951,7 +1951,7 @@ int sdw_handle_slave_status(struct sdw_bus *bus,
 				"signaling initialization completion for Slave %d\n",
 				slave->dev_num);
 
-			complete(&slave->initialization_complete);
+			complete_all(&slave->initialization_complete);
 
 			/*
 			 * If the manager became pm_runtime active, the peripherals will be




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