linux-stable.git/drivers/dma/sh, branch v4.7

dmaengine: rcar-dmac: clear pertinence number of channels

2016-03-03T16:21:14+00:00

DMACHCLR clears each channels, but its channel number is based on
its SoC or IP. Current driver is using fixed 0x7fff (= for 15ch),
it is not good match for Gen3 or Gen2 Audio DMAC. This patch fixes it

Signed-off-by: Kuninori Morimoto 
Acked-by: Geert Uytterhoeven 
Acked-by: Laurent Pinchart 
Signed-off-by: Vinod Koul

dmaengine: sh: shdmac: don't open code of_device_get_match_data()

2016-03-03T16:02:45+00:00

This change will also make Coverity happy by avoiding a theoretical NULL
pointer dereference; yet another reason is to use the above helper function
to tighten the code and make it more readable.

Signed-off-by: Wolfram Sang 
Acked-by: Geert Uytterhoeven 
Signed-off-by: Vinod Koul

dmaengine: sh: Use ARCH_RENESAS

2016-02-08T03:18:08+00:00

Make use of ARCH_RENESAS in place of ARCH_SHMOBILE.

This is part of an ongoing process to migrate from ARCH_SHMOBILE to
ARCH_RENESAS the motivation for which being that RENESAS seems to be a more
appropriate name than SHMOBILE for the majority of Renesas ARM based SoCs.

Signed-off-by: Simon Horman 
Signed-off-by: Vinod Koul

Merge tag 'dmaengine-4.5-rc1' of git://git.infradead.org/users/vkoul/slave-dma

2016-01-13T18:59:52+00:00

Pull dmaengine updates from Vinod Koul:
 "This round we have few new features, new driver and updates to few
  drivers.

  The new features to dmaengine core are:
   - Synchronized transfer termination API to terminate the dmaengine
     transfers in synchronized and async fashion as required by users.
     We have its user now in ALSA dmaengine lib, img, at_xdma, axi_dmac
     drivers.
   - Universal API for channel request and start consolidation of
     request flows.  It's user is ompa-dma driver.
   - Introduce reuse of descriptors and use in pxa_dma driver

  Add/Remove:
   - New STM32 DMA driver
   - Removal of unused R-Car HPB-DMAC driver

  Updates:
   - ti-dma-crossbar updates for supporting eDMA
   - tegra-apb pm updates
   - idma64
   - mv_xor updates
   - ste_dma updates"

* tag 'dmaengine-4.5-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (54 commits)
  dmaengine: mv_xor: add suspend/resume support
  dmaengine: mv_xor: de-duplicate mv_chan_set_mode*()
  dmaengine: mv_xor: remove mv_xor_chan->current_type field
  dmaengine: omap-dma: Add support for DMA filter mapping to slave devices
  dmaengine: edma: Add support for DMA filter mapping to slave devices
  dmaengine: core: Introduce new, universal API to request a channel
  dmaengine: core: Move and merge the code paths using private_candidate
  dmaengine: core: Skip mask matching when it is not provided to private_candidate
  dmaengine: mdc: Correct terminate_all handling
  dmaengine: edma: Add probe callback to edma_tptc_driver
  dmaengine: dw: fix potential memory leak in dw_dma_parse_dt()
  dmaengine: stm32-dma: Fix unchecked deference of chan->desc
  dmaengine: sh: Remove unused R-Car HPB-DMAC driver
  dmaengine: usb-dmac: Document SoC specific compatibility strings
  ste_dma40: Delete an unnecessary variable initialisation in d40_probe()
  ste_dma40: Delete another unnecessary check in d40_probe()
  ste_dma40: Delete an unnecessary check before the function call "kmem_cache_destroy"
  dmaengine: tegra-apb: Free interrupts before killing tasklets
  dmaengine: tegra-apb: Update driver to use GFP_NOWAIT
  dmaengine: tegra-apb: Only save channel state for those in use
  ...

Merge branch 'topic/rcar' into for-linus

2016-01-06T09:48:36+00:00

dmaengine: sh: Remove unused R-Car HPB-DMAC driver

2015-12-10T04:13:33+00:00

As of commit 4baadb9e05c68962 ("ARM: shmobile: r8a7778: remove obsolete
setup code"), the Renesas R-Car HPB-DMAC driver is no longer used.
In theory it could still be used on R-Car Gen1 SoCs, but that requires
adding DT support to the driver, which is not planned.

Remove the driver, it can be resurrected from git history when needed.

Signed-off-by: Geert Uytterhoeven 
Acked-by: Simon Horman 
Signed-off-by: Vinod Koul

dmaengine: usb-dmac: fix endless loop in usb_dmac_chan_terminate_all()

2015-12-05T08:07:51+00:00

This patch fixes an issue that list_for_each_entry() in
usb_dmac_chan_terminate_all() is possible to cause endless loop because
this will move own desc to the desc_freed. So, this driver should use
list_for_each_entry_safe() instead of list_for_each_entry().

Signed-off-by: Yoshihiro Shimoda 
Signed-off-by: Vinod Koul

dmaengine: sh: usb-dmac: Fix pm_runtime_{enable,disable}() imbalance

2015-11-16T03:09:52+00:00

If the call to pm_runtime_get_sync() failed, Runtime PM was left
enabled.

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Vinod Koul

dmaengine: sh: usb-dmac: Fix crash on runtime suspend

2015-11-16T03:09:42+00:00

If CONFIG_PREEMPT=y:

    Unable to handle kernel NULL pointer dereference at virtual address 00000014
    pgd = c0003000
    [00000014] *pgd=80000040004003, *pmd=00000000
    Internal error: Oops: 206 [#1] PREEMPT SMP ARM
    Modules linked in:
    CPU: 0 PID: 17 Comm: kworker/0:1 Tainted: G        W       4.3.0-rc3-koelsch-022
    71-g705498fc5e6a5da8-dirty #1789
    Hardware name: Generic R8A7791 (Flattened Device Tree)
    Workqueue: pm pm_runtime_work
    task: ef578e40 ti: ef57a000 task.ti: ef57a000
    PC is at usb_dmac_chan_halt+0xc/0xc0
    LR is at usb_dmac_runtime_suspend+0x28/0x38
    pc : []    lr : []    psr: 80000113
    sp : ef57bdf8  ip : 00000008  fp : 00000003
    r10: 00000008  r9 : c06ab928  r8 : ef49e810
    r7 : 00000000  r6 : 000000ac  r5 : ef770010  r4 : 00000000
    r3 : 00000000  r2 : 8ffc2b84  r1 : 00000000  r0 : ef770010
    Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
    Control: 30c5307d  Table: 40003000  DAC: fffffffd
    Process kworker/0:1 (pid: 17, stack limit = 0xef57a210)
    Stack: (0xef57bdf8 to 0xef57c000)

    [...

    [] (usb_dmac_chan_halt) from [] (usb_dmac_runtime_suspend+0x28/0x38)
    [] (usb_dmac_runtime_suspend) from [] (pm_genpd_runtime_suspend+0x74/0x23c)

This happens because usb_dmac_probe() calls pm_runtime_put() before
usb_dmac_chan_probe(), leading to the device being suspended before the
DMA channels are initialized, causing a NULL pointer dereference.

Move the call to pm_runtime_put() to the end of usb_dmac_probe() to fix
this.

Add a check to usb_dmac_runtime_suspend() to prevent the crash from
happening in the error path.

Reported-by: Sergei Shtylyov 
Signed-off-by: Geert Uytterhoeven 
Tested-by: Yoshihiro Shimoda 
Signed-off-by: Vinod Koul

dmaengine: sort the sh Makefile

2015-08-26T02:20:17+00:00

Acked-by: Geert Uytterhoeven 
Signed-off-by: Vinod Koul