linux-kernel - [PATCH v4 1/4] firmware_loader: expand firmware error codes with up-to-date error

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Message-Id: <20260106-v6-10-topic-touchscreen-axiom-v4-1-9e9b69c84926@pengutronix.de>
Date: Tue, 06 Jan 2026 19:17:08 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Luis Chamberlain <mcgrof@...nel.org>, 
 Russ Weight <russ.weight@...ux.dev>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Andrew Morton <akpm@...ux-foundation.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Dmitry Torokhov <dmitry.torokhov@...il.com>, 
 Kamel Bouhara <kamel.bouhara@...tlin.com>, 
 Marco Felsch <kernel@...gutronix.de>, Henrik Rydberg <rydberg@...math.org>, 
 Danilo Krummrich <dakr@...nel.org>, Danilo Krummrich <dakr@...nel.org>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-input@...r.kernel.org, kernel@...gutronix.de, 
 Marco Felsch <m.felsch@...gutronix.de>
Subject: [PATCH v4 1/4] firmware_loader: expand firmware error codes with
 up-to-date error

Add FW_UPLOAD_ERR_DUPLICATE to allow drivers to inform the firmware_loader
framework that the update is not required. This can be the case if the
user provided firmware matches the current running firmware.

Sync lib/test_firmware.c accordingly.

Reviewed-by: Russ Weight <russ.weight@...ux.dev>
Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>
Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
---
 drivers/base/firmware_loader/sysfs_upload.c | 1 +
 include/linux/firmware.h                    | 2 ++
 lib/test_firmware.c                         | 1 +
 3 files changed, 4 insertions(+)

diff --git a/drivers/base/firmware_loader/sysfs_upload.c b/drivers/base/firmware_loader/sysfs_upload.c
index c3797b93c5f5a2ecf2ae34707893c89eb7773154..9e93070b2c24179986b868a24b09cf051776c644 100644
--- a/drivers/base/firmware_loader/sysfs_upload.c
+++ b/drivers/base/firmware_loader/sysfs_upload.c
@@ -28,6 +28,7 @@ static const char * const fw_upload_err_str[] = {
 	[FW_UPLOAD_ERR_RW_ERROR]     = "read-write-error",
 	[FW_UPLOAD_ERR_WEAROUT]	     = "flash-wearout",
 	[FW_UPLOAD_ERR_FW_INVALID]   = "firmware-invalid",
+	[FW_UPLOAD_ERR_DUPLICATE]    = "firmware-duplicate",
 };

 static const char *fw_upload_progress(struct device *dev,
diff --git a/include/linux/firmware.h b/include/linux/firmware.h
index aae1b85ffc10e20e9c3c9b6009d26b83efd8cb24..fe7797be4c08cd62cdad9617b8f70095d5e0af2f 100644
--- a/include/linux/firmware.h
+++ b/include/linux/firmware.h
@@ -29,6 +29,7 @@ struct firmware {
  * @FW_UPLOAD_ERR_RW_ERROR: read or write to HW failed, see kernel log
  * @FW_UPLOAD_ERR_WEAROUT: FLASH device is approaching wear-out, wait & retry
  * @FW_UPLOAD_ERR_FW_INVALID: invalid firmware file
+ * @FW_UPLOAD_ERR_DUPLICATE: firmware is already up to date (duplicate)
  * @FW_UPLOAD_ERR_MAX: Maximum error code marker
  */
 enum fw_upload_err {
@@ -41,6 +42,7 @@ enum fw_upload_err {
 	FW_UPLOAD_ERR_RW_ERROR,
 	FW_UPLOAD_ERR_WEAROUT,
 	FW_UPLOAD_ERR_FW_INVALID,
+	FW_UPLOAD_ERR_DUPLICATE,
 	FW_UPLOAD_ERR_MAX
 };

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index be4f93124901e5faac41f48a66dabe6da56be0ca..952ec1cb03102911dbea9abd648ab9d9e0112a46 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -1134,6 +1134,7 @@ static const char * const fw_upload_err_str[] = {
 	[FW_UPLOAD_ERR_RW_ERROR]     = "read-write-error",
 	[FW_UPLOAD_ERR_WEAROUT]	     = "flash-wearout",
 	[FW_UPLOAD_ERR_FW_INVALID]   = "firmware-invalid",
+	[FW_UPLOAD_ERR_DUPLICATE]    = "firmware-duplicate",
 };

 static void upload_err_inject_error(struct test_firmware_upload *tst,

-- 
2.47.3