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Sebastian Reichel 63399974ef i2c: i2c-tiny-usb: fix buffer not being DMA capable ... commit 5165da5923 upstream. Since v4.9 i2c-tiny-usb generates the below call trace and longer works, since it can't communicate with the USB device. The reason is, that since v4.9 the USB stack checks, that the buffer it should transfer is DMA capable. This was a requirement since v2.2 days, but it usually worked nevertheless. [ 17.504959] ------------[ cut here ]------------ [ 17.505488] WARNING: CPU: 0 PID: 93 at drivers/usb/core/hcd.c:1587 usb_hcd_map_urb_for_dma+0x37c/0x570 [ 17.506545] transfer buffer not dma capable [ 17.507022] Modules linked in: [ 17.507370] CPU: 0 PID: 93 Comm: i2cdetect Not tainted 4.11.0-rc8+ #10 [ 17.508103] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 17.509039] Call Trace: [ 17.509320] ? dump_stack+0x5c/0x78 [ 17.509714] ? __warn+0xbe/0xe0 [ 17.510073] ? warn_slowpath_fmt+0x5a/0x80 [ 17.510532] ? nommu_map_sg+0xb0/0xb0 [ 17.510949] ? usb_hcd_map_urb_for_dma+0x37c/0x570 [ 17.511482] ? usb_hcd_submit_urb+0x336/0xab0 [ 17.511976] ? wait_for_completion_timeout+0x12f/0x1a0 [ 17.512549] ? wait_for_completion_timeout+0x65/0x1a0 [ 17.513125] ? usb_start_wait_urb+0x65/0x160 [ 17.513604] ? usb_control_msg+0xdc/0x130 [ 17.514061] ? usb_xfer+0xa4/0x2a0 [ 17.514445] ? __i2c_transfer+0x108/0x3c0 [ 17.514899] ? i2c_transfer+0x57/0xb0 [ 17.515310] ? i2c_smbus_xfer_emulated+0x12f/0x590 [ 17.515851] ? _raw_spin_unlock_irqrestore+0x11/0x20 [ 17.516408] ? i2c_smbus_xfer+0x125/0x330 [ 17.516876] ? i2c_smbus_xfer+0x125/0x330 [ 17.517329] ? i2cdev_ioctl_smbus+0x1c1/0x2b0 [ 17.517824] ? i2cdev_ioctl+0x75/0x1c0 [ 17.518248] ? do_vfs_ioctl+0x9f/0x600 [ 17.518671] ? vfs_write+0x144/0x190 [ 17.519078] ? SyS_ioctl+0x74/0x80 [ 17.519463] ? entry_SYSCALL_64_fastpath+0x1e/0xad [ 17.519959] ---[ end trace d047c04982f5ac50 ]--- Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Till Harbaum <till@harbaum.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2017-06-07 12:07:46 +02:00
..
algos	i2c: algo-bit: declare i2c_bit_quirk_no_clk_stretch as static	2016-05-11 17:16:30 +02:00
busses	i2c: i2c-tiny-usb: fix buffer not being DMA capable	2017-06-07 12:07:46 +02:00
muxes	i2c: mux: pca954x: fix i2c mux selection caching	2017-01-19 20:18:05 +01:00
i2c-boardinfo.c	i2c: remove __init from i2c_register_board_info()	2016-06-19 14:13:50 +02:00
i2c-core.c	i2c: print correct device invalid address	2017-01-19 20:18:02 +01:00
i2c-core.h	i2c: remove FSF address	2014-11-07 18:35:33 +01:00
i2c-dev.c	i2c: fix kernel memory disclosure in dev interface	2017-01-19 20:18:02 +01:00
i2c-mux.c	i2c: add missing of_node_put in i2c_mux_del_adapters	2017-03-18 19:14:30 +08:00
i2c-slave-eeprom.c	i2c: Drop owner assignment from i2c_driver	2015-08-10 08:37:35 +02:00
i2c-smbus.c	i2c: i2c-smbus: fix i2c_handle_smbus_host_notify documentation	2016-07-18 20:09:54 +02:00
i2c-stub.c	i2c: i2c-stub: sort includes	2016-02-20 23:33:39 +01:00
Kconfig	i2c: mux: fix up dependencies	2016-11-14 18:23:30 +01:00
Makefile	i2c: slave-eeprom: add eeprom simulator driver	2014-12-11 22:25:54 +01:00