Build failure on Linux kernel 7.0: from_timer() and del_timer_sync() removed from timer API

[yanorei32]

After upgrading the system to Linux kernel 7.0, the module fails to build due to removed timer APIs.
The following errors occur during compilation:

make CHECK="/usr/bin/sparse" -C /lib/modules/7.0.2-arch1-1/build M=/usr/src/ms912x-0.1 modules
make[1]: Entering directory '/usr/lib/modules/7.0.2-arch1-1/build'
make[2]: Entering directory '/usr/src/ms912x-0.1'
  CC [M]  ms912x_registers.o
  CC [M]  ms912x_connector.o
  CC [M]  ms912x_transfer.o
ms912x_transfer.c: In function ‘ms912x_request_timeout’:
ms912x_transfer.c:12:46: error: implicit declaration of function ‘from_timer’; did you mean ‘mod_timer’? [-Wimplicit-function-declaration]
   12 |         struct ms912x_usb_request *request = from_timer(request, t, timer);
      |                                              ^~~~~~~~~~
      |                                              mod_timer
ms912x_transfer.c:12:69: error: ‘timer’ undeclared (first use in this function); did you mean ‘ktimerd’?
   12 |         struct ms912x_usb_request *request = from_timer(request, t, timer);
      |                                                                     ^~~~~
      |                                                                     ktimerd
ms912x_transfer.c:12:69: note: each undeclared identifier is reported only once for each function it appears in
ms912x_transfer.c: In function ‘ms912x_request_work’:
ms912x_transfer.c:31:9: error: implicit declaration of function ‘del_timer_sync’ [-Wimplicit-function-declaration]
   31 |         del_timer_sync(&request->timer);
      |         ^~~~~~~~~~~~~~
make[4]: *** [/usr/lib/modules/7.0.2-arch1-1/build/scripts/Makefile.build:289: ms912x_transfer.o] Error 1
make[3]: *** [/usr/lib/modules/7.0.2-arch1-1/build/Makefile:2105: .] Error 2
make[2]: *** [/usr/lib/modules/7.0.2-arch1-1/build/Makefile:248: __sub-make] Error 2
make[2]: Leaving directory '/usr/src/ms912x-0.1'
make[1]: *** [Makefile:248: __sub-make] Error 2
make[1]: Leaving directory '/usr/lib/modules/7.0.2-arch1-1/build'
make: *** [Makefile:15: modules] Error 2

These functions were deprecated in late 6.x kernels and fully removed in 7.0.
The driver still uses:

• from_timer()
• del_timer_sync()

Both must be replaced with the modern timer API.

Cause

Linux 7.0 removed several legacy timer helpers.
The correct replacements are:

• from_timer() → container_of()
• del_timer_sync() → timer_shutdown_sync()

Proposed fix (diff)

--- a/ms912x_transfer.c
+++ b/ms912x_transfer.c
@@ -1,5 +1,6 @@
 #include <linux/dma-buf.h>
 #include <linux/vmalloc.h>
+#include <linux/timer.h>
 
 #include <drm/drm_drv.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -7,9 +8,11 @@
 #include "ms912x.h"
 
 static void ms912x_request_timeout(struct timer_list *t)
 {
-   struct ms912x_usb_request *request = from_timer(request, t, timer);
+   struct ms912x_usb_request *request =
+       container_of(t, struct ms912x_usb_request, timer);
+
    usb_sg_cancel(&request->sgr);
 }
 
@@ -32,7 +35,7 @@ static void ms912x_request_work(struct work_struct *work)
    usb_sg_init(sgr, usbdev, usb_sndbulkpipe(usbdev, 0x04), 0,
            transfer_sgt->sgl, transfer_sgt->nents,
            request->transfer_len, GFP_KERNEL);
    mod_timer(&request->timer, jiffies + msecs_to_jiffies(5000));
    usb_sg_wait(sgr);
-   del_timer_sync(&request->timer);
+   timer_shutdown_sync(&request->timer);
    complete(&request->done);
 }

Environment

Kernel: Linux 7.0.2-arch1-1 x86_64

Expected behavior

Module should build successfully on Linux 7.0+.

Actual behavior

Build fails due to removed timer API functions.