[PATCH 0/3] dma: make dma_alloc() and dma_zalloc() fallible

[Sascha Hauer]

dma_alloc() and dma_zalloc() are implemented with xmemalign() and never
return NULL. That's unlike malloc() and calloc(), and many callers check
for NULL anyway, so they never get to handle an allocation failure.

This series adds dma_xalloc() and dma_xzalloc() for callers that rely on
the allocation to always succeed, switches all callers that don't check
the result over to them, and finally lets dma_alloc() return NULL on
allocation failure.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
Sascha Hauer (3):
      dma: add dma_xalloc() and dma_xzalloc()
      treewide: use dma_xalloc()/dma_xzalloc() where the result isn't checked
      dma: let dma_alloc() and dma_zalloc() fail

 commands/mmc_extcsd.c                  |  2 +-
 common/block.c                         |  2 +-
 drivers/ata/disk_ata_drive.c           |  2 +-
 drivers/dma/map.c                      | 19 ++++++++++++++++++-
 drivers/input/usb_kbd.c                |  2 +-
 drivers/mci/mci-core.c                 | 10 +++++-----
 drivers/net/bcmgenet.c                 |  2 +-
 drivers/net/designware.c               |  4 ++--
 drivers/net/dsa.c                      |  6 +++---
 drivers/net/e1000/main.c               |  2 +-
 drivers/net/fsl-fman.c                 |  2 +-
 drivers/net/fsl_enetc.c                |  2 +-
 drivers/net/macb.c                     |  2 +-
 drivers/net/orion-gbe.c                |  2 +-
 drivers/net/r8169_main.c               |  4 ++--
 drivers/net/usb/smsc95xx.c             |  2 +-
 drivers/usb/core/usb.c                 |  8 ++++----
 drivers/usb/gadget/function/dfu.c      |  2 +-
 drivers/usb/gadget/function/u_serial.c |  2 +-
 drivers/usb/gadget/udc/fsl_udc.c       |  2 +-
 drivers/usb/storage/transport.c        |  6 +++---
 drivers/usb/storage/usb.c              |  8 ++++----
 drivers/video/mipi_dbi.c               |  4 ++--
 drivers/video/ramfb.c                  |  2 +-
 fs/ext4/ext_barebox.c                  |  4 ++--
 include/dma.h                          | 12 ++++++++++++
 include/linux/slab.h                   |  6 +++---
 include/net.h                          |  2 +-
 28 files changed, 76 insertions(+), 47 deletions(-)
---
base-commit: 7a1f6c08dc94cc8b6a2388d760e9ef793bf64e5b
change-id: 20261016-dma-alloc-d79532c3c096

Best regards,
-- 
Sascha Hauer <s.hauer at pengutronix.de>