commit 1f9cd915b64bb95f7b41667b4bf8b22f0a0a557b upstream. The prep_memcpy call was not setting any meaningful burst and width because it was relying on the dma_slave_config was not set already. Rework the needed conversion functions, and hardcode the width and burst to use. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
commit 6e4a2a83f95826201bbd89f55522537ea52d1d67 upstream.
Fix a NULL pointer dereference after unbinding the driver, if channel
resources were not yet allocated (no call to
pl330_alloc_chan_resources()):
$ echo 12850000.mdma > /sys/bus/amba/drivers/dma-pl330/unbind
[ 13.606533] DMA pl330_control: removing pch: eeab6800, chan: eeab6814, thread: (null)
[ 13.614472] Unable to handle kernel NULL pointer dereference at virtual address 0000000c
[ 13.622537] pgd = ee284000
[ 13.625228] [0000000c] *pgd=6e1e4831, *pte=00000000, *ppte=00000000
[ 13.631482] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
[ 13.636859] Modules linked in:
[ 13.639903] CPU: 0 PID: 1 Comm: sh Not tainted 3.17.0-rc3-next-20140904-00004-g7020ffc33ca3-dirty #420
[ 13.649187] task: ee80a800 ti: ee888000 task.ti: ee888000
[ 13.654589] PC is at _stop+0x8/0x2c8
[ 13.658131] LR is at pl330_control+0x70/0x2e8
[ 13.662468] pc : [<c0206028>] lr : [<c020649c>] psr: 60000093
[ 13.662468] sp : ee889e58 ip : 00000001 fp : 000bab70
[ 13.673922] r10: eeab6814 r9 : ee16debc r8 : 00000000
[ 13.679131] r7 : eeab685c r6 : 60000013 r5 : ee16de10 r4 : eeab6800
[ 13.685641] r3 : 00000002 r2 : 00000000 r1 : 00010000 r0 : 00000000
[ 13.692153] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
[ 13.699357] Control: 10c5387d Table: 6e28404a DAC: 00000015
[ 13.705085] Process sh (pid: 1, stack limit = 0xee888240)
[ 13.710466] Stack: (0xee889e58 to 0xee88a000)
[ 13.714808] 9e40: 00000002 eeab6800
[ 13.722969] 9e60: ee16de10 eeab6800 ee16de10 60000013 eeab685c c020649c 00000000 c040280c
[ 13.731128] 9e80: ee889e80 ee889e80 ee16de18 ee16de10 eeab6880 eeab6814 00200200 eeab68a8
[ 13.739287] 9ea0: 00100100 c0208048 00000000 c0409fc4 eea80800 eea808f8 c0605c44 0000000e
[ 13.747446] 9ec0: 0000000e eeb3960c eeb39600 c0203c48 eea80800 c0605c44 c0605a8c c023f694
[ 13.755605] 9ee0: ee80a800 eea80834 eea80800 c023f704 ee80a800 eea80800 c0605c44 c023e8ec
[ 13.763764] 9f00: 0000000e ee149780 ee29e580 ee889f80 ee29e580 c023e19c 0000000e c01167e4
[ 13.771923] 9f20: c01167a0 00000000 00000000 c0115e88 00000000 00000000 ee0b1a00 0000000e
[ 13.780082] 9f40: b6f48000 ee889f80 0000000e ee888000 b6f48000 c00bfadc 00000000 00000003
[ 13.788241] 9f60: 00000000 00000000 00000000 ee0b1a00 ee0b1a00 0000000e b6f48000 c00bfdf4
[ 13.796401] 9f80: 00000000 00000000 ffffffff 0000000e b6f48000 b6edc5d0 00000004 c000e7a4
[ 13.804560] 9fa0: 00000000 c000e620 0000000e b6f48000 00000001 b6f48000 0000000e 00000000
[ 13.812719] 9fc0: 0000000e b6f48000 b6edc5d0 00000004 0000000e b6f4c8c0 000c3470 000bab70
[ 13.820879] 9fe0: 00000000 bed2aa50 b6e18bdc b6e6b52c 60000010 00000001 c0c0c0c0 c0c0c0c0
[ 13.829058] [<c0206028>] (_stop) from [<c020649c>] (pl330_control+0x70/0x2e8)
[ 13.836165] [<c020649c>] (pl330_control) from [<c0208048>] (pl330_remove+0xb0/0xdc)
[ 13.843800] [<c0208048>] (pl330_remove) from [<c0203c48>] (amba_remove+0x24/0xc0)
[ 13.851272] [<c0203c48>] (amba_remove) from [<c023f694>] (__device_release_driver+0x70/0xc4)
[ 13.859685] [<c023f694>] (__device_release_driver) from [<c023f704>] (device_release_driver+0x1c/0x28)
[ 13.868971] [<c023f704>] (device_release_driver) from [<c023e8ec>] (unbind_store+0x58/0x90)
[ 13.877303] [<c023e8ec>] (unbind_store) from [<c023e19c>] (drv_attr_store+0x20/0x2c)
[ 13.885036] [<c023e19c>] (drv_attr_store) from [<c01167e4>] (sysfs_kf_write+0x44/0x48)
[ 13.892928] [<c01167e4>] (sysfs_kf_write) from [<c0115e88>] (kernfs_fop_write+0xc0/0x17c)
[ 13.901090] [<c0115e88>] (kernfs_fop_write) from [<c00bfadc>] (vfs_write+0xa0/0x1a8)
[ 13.908812] [<c00bfadc>] (vfs_write) from [<c00bfdf4>] (SyS_write+0x40/0x8c)
[ 13.915850] [<c00bfdf4>] (SyS_write) from [<c000e620>] (ret_fast_syscall+0x0/0x30)
[ 13.923392] Code: e5813010 e12fff1e e92d40f0 e24dd00c (e590200c)
[ 13.929467] ---[ end trace 10064e15a5929cf8 ]---
Terminate the thread and free channel resource only if channel resources
were allocated (thread is not NULL).
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: b3040e40675e ("DMA: PL330: Add dma api driver")
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
commit 0f5ebabdd03b471da1906f7edddc61ceb35cee02 upstream.
If dma_async_device_register() returns error and probe should clean up
and return error, a NULL pointer exception happens because of
dereference of not allocated channel thread:
Dmesg log (from early printk):
dma-pl330 12680000.pdma: unable to register DMAC
DMA pl330_control: removing pch: eeac4000, chan: eeac4014, thread: (null)
Unable to handle kernel NULL pointer dereference at virtual address 0000000c
pgd = c0004000
[0000000c] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.17.0-rc3-next-20140904-00005-g6cc4c1937d90-dirty #427
task: ee80a800 ti: ee888000 task.ti: ee888000
PC is at _stop+0x8/0x2c8
LR is at pl330_control+0x70/0x2e8
pc : [<c0205dc8>] lr : [<c020623c>] psr: 60000193
sp : ee889df8 ip : 00000002 fp : 00000000
r10: eeac4014 r9 : ee0e62bc r8 : 00000000
r7 : eeac405c r6 : 60000113 r5 : ee0e6210 r4 : eeac4000
r3 : 00000002 r2 : 00000002 r1 : 00010000 r0 : 00000000
Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: 10c5387d Table: 4000404a DAC: 00000015
Process swapper/0 (pid: 1, stack limit = 0xee888240)
Stack: (0xee889df8 to 0xee88a000)
9de0: 00000002 eeac4000
9e00: ee0e6210 eeac4000 ee0e6210 60000113 eeac405c c020623c 00000000 c020725c
9e20: ee889e20 ee889e20 ee0e6210 eeac4080 00200200 00100100 eeac4014 00000020
9e40: ee0e6218 c0208374 00000000 ee9bb340 ee0e6210 00000000 00000000 c0605cd8
9e60: ee970000 c0605c84 ee9700f8 00000000 c05c4270 00000000 00000000 c0203b3c
9e80: ee970000 c06624a8 00000000 c0605c84 00000000 c023f890 ee970000 c0605c84
9ea0: ee970034 00000000 c05b23d0 c023fa3c 00000000 c0605c84 c023f9b0 c023e0d4
9ec0: ee947e78 ee9b9440 c0605c84 eea1e780 c0605acc c023f094 c0513b50 c0605c84
9ee0: c05ecbd8 c0605c84 c05ecbd8 ee11ba40 c0626500 c0240064 00000000 c05ecbd8
9f00: c05ecbd8 c0008964 c040f13c 0000009f c0626500 c057465c ee80a800 60000113
9f20: 00000000 c05efdb0 60000113 00000000 ef7fc89d c0421168 0000008f c003787c
9f40: c0573d6c 00000006 ef7fc8bb 00000006 c05efd50 ef7fc800 c05dfbc4 00000006
9f60: c05c4264 c0626500 0000008f c05c4270 c059b518 c059bcb4 00000006 00000006
9f80: c059b518 c003c08c 00000000 c040091c 00000000 00000000 00000000 00000000
9fa0: 00000000 c0400924 00000000 c000e7b8 00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 c0c0c0c0 c0c0c0c0
[<c0205dc8>] (_stop) from [<c020623c>] (pl330_control+0x70/0x2e8)
[<c020623c>] (pl330_control) from [<c0208374>] (pl330_probe+0x594/0x75c)
[<c0208374>] (pl330_probe) from [<c0203b3c>] (amba_probe+0xb8/0x120)
[<c0203b3c>] (amba_probe) from [<c023f890>] (driver_probe_device+0x10c/0x22c)
[<c023f890>] (driver_probe_device) from [<c023fa3c>] (__driver_attach+0x8c/0x90)
[<c023fa3c>] (__driver_attach) from [<c023e0d4>] (bus_for_each_dev+0x54/0x88)
[<c023e0d4>] (bus_for_each_dev) from [<c023f094>] (bus_add_driver+0xd4/0x1d0)
[<c023f094>] (bus_add_driver) from [<c0240064>] (driver_register+0x78/0xf4)
[<c0240064>] (driver_register) from [<c0008964>] (do_one_initcall+0x80/0x1d0)
[<c0008964>] (do_one_initcall) from [<c059bcb4>] (kernel_init_freeable+0x108/0x1d4)
[<c059bcb4>] (kernel_init_freeable) from [<c0400924>] (kernel_init+0x8/0xec)
[<c0400924>] (kernel_init) from [<c000e7b8>] (ret_from_fork+0x14/0x3c)
Code: e5813010 e12fff1e e92d40f0 e24dd00c (e590200c)
---[ end trace c94b2f4f38dff3bf ]---
This happens because the necessary resources were not yet allocated - no
call to pl330_alloc_chan_resources().
Terminate the thread and free channel resource only if channel thread is not NULL.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: 0b94c5771705 ("DMA: PL330: Add check if device tree compatible")
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
When the audio stream is paused or suspended we stop the sDMA and when it is unpaused/resumed we start the channel without reconfiguring it. The omap_dma_stop() clears the link configuration when we pause the dma, but it is not setting it back on start. This will result only one audio buffer to be played back and the DMA will stop, since the linking is disabled. We need to restore the CLINK_CTRL register in case of resume. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Add mb() call to resume path to ensure the necessary barrier. Resume can happen after waking up from suspend for example. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
We need to make sure to deqeueue the descriptor from the active list before we call vchan_cookie_complete(). Also we need obviously only set chan->desc to NULL after we stopped using it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Pull slave-dma updates from Vinod Koul:
"Some notable changes are:
- new driver for AMBA AXI NBPF by Guennadi
- new driver for sun6i controller by Maxime
- pl330 drivers fixes from Lar's
- sh-dma updates and fixes from Laurent, Geert and Kuninori
- Documentation updates from Geert
- drivers fixes and updates spread over dw, edma, freescale, mpc512x
etc.."
* 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma: (72 commits)
dmaengine: sun6i: depends on RESET_CONTROLLER
dma: at_hdmac: fix invalid remaining bytes detection
dmaengine: nbpfaxi: don't build this driver where it cannot be used
dmaengine: nbpf_error_get_channel() can be static
dma: pl08x: Use correct specifier for size_t values
dmaengine: Remove the context argument to the prep_dma_cyclic operation
dmaengine: nbpfaxi: convert to tasklet
dmaengine: nbpfaxi: fix a theoretical race
dmaengine: add a driver for AMBA AXI NBPF DMAC IP cores
dmaengine: add device tree binding documentation for the nbpfaxi driver
dmaengine: edma: Do not register second device when booted with DT
dmaengine: edma: Do not change the error code returned from edma_alloc_slot
dmaengine: rcar-dmac: Add device tree bindings documentation
dmaengine: shdma: Allocate cyclic sg list dynamically
dmaengine: shdma: Make channel filter ignore unrelated devices
dmaengine: sh: Rework Kconfig and Makefile
dmaengine: sun6i: Fix memory leaks
dmaengine: sun6i: Free the interrupt before killing the tasklet
dmaengine: sun6i: Remove switch statement from buswidth convertion routine
dmaengine: of: kconfig: select DMA_ENGINE when DMA_OF is selected
...
Fixes a compilation error when RESET_CONTROLLER is not enabled in the configuration. drivers/dma/sun6i-dma.c: In function 'sun6i_dma_probe': drivers/dma/sun6i-dma.c:911:2: error: implicit declaration of function 'devm_reset_control_get' [-Werror=implicit-function-declaration] Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Found using smatch: drivers/dma/at_hdmac.c:299 atc_get_bytes_left() warn: unsigned 'atchan->remain_desc' is never less than zero. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Although this driver doesn't have any explicit compile-time architecture dependencies, it is better not to bloat kernels on those platforms, where this driver isn't needed, unless a compile test is being performed. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>