diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-23 09:57:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-23 09:57:39 -0700 |
| commit | 56fff1bb0f31358bf81a3c64a8dcd6da0dc44263 (patch) | |
| tree | ac9b5d6a04c02e345ac66caaa21d67b8adc5f396 | |
| parent | fde8e33d106846b081b0e6cd5e283af7146eb7e4 (diff) | |
| parent | e2c824924cdb41528932c550647406ad81336b18 (diff) | |
Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang:
"Fix the i2c-designware regression of rc2.
Also, a DMA buffer fix for the tiny-usb driver where the USB core now
loudly complains about the non DMA-capable buffer"
[ I had cherry-picked the designware fix separately because it hit my
laptop, but here is the proper sync with the i2c tree - Linus ]
* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: designware: Fix bogus sda_hold_time due to uninitialized vars
i2c: i2c-tiny-usb: fix buffer not being DMA capable
| -rw-r--r-- | drivers/i2c/busses/i2c-tiny-usb.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-tiny-usb.c b/drivers/i2c/busses/i2c-tiny-usb.c index 0ed77eeff31e..a2e3dd715380 100644 --- a/drivers/i2c/busses/i2c-tiny-usb.c +++ b/drivers/i2c/busses/i2c-tiny-usb.c @@ -178,22 +178,39 @@ static int usb_read(struct i2c_adapter *adapter, int cmd, int value, int index, void *data, int len) { struct i2c_tiny_usb *dev = (struct i2c_tiny_usb *)adapter->algo_data; + void *dmadata = kmalloc(len, GFP_KERNEL); + int ret; + + if (!dmadata) + return -ENOMEM; /* do control transfer */ - return usb_control_msg(dev->usb_dev, usb_rcvctrlpipe(dev->usb_dev, 0), + ret = usb_control_msg(dev->usb_dev, usb_rcvctrlpipe(dev->usb_dev, 0), cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE | - USB_DIR_IN, value, index, data, len, 2000); + USB_DIR_IN, value, index, dmadata, len, 2000); + + memcpy(data, dmadata, len); + kfree(dmadata); + return ret; } static int usb_write(struct i2c_adapter *adapter, int cmd, int value, int index, void *data, int len) { struct i2c_tiny_usb *dev = (struct i2c_tiny_usb *)adapter->algo_data; + void *dmadata = kmemdup(data, len, GFP_KERNEL); + int ret; + + if (!dmadata) + return -ENOMEM; /* do control transfer */ - return usb_control_msg(dev->usb_dev, usb_sndctrlpipe(dev->usb_dev, 0), + ret = usb_control_msg(dev->usb_dev, usb_sndctrlpipe(dev->usb_dev, 0), cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE, - value, index, data, len, 2000); + value, index, dmadata, len, 2000); + + kfree(dmadata); + return ret; } static void i2c_tiny_usb_free(struct i2c_tiny_usb *dev) |