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    Subject[PATCH 3.16 196/233] i2c: ismt: fix wrong device address when unmap the data buffer
    3.16.48-rc1 review patch.  If anyone has any objections, please let me know.


    From: Liwei Song <>

    commit 17e83549e199d89aace7788a9f11c108671eecf5 upstream.

    Fix the following kernel bug:

    kernel BUG at drivers/iommu/intel-iommu.c:3260!
    invalid opcode: 0000 [#5] PREEMPT SMP
    Hardware name: Intel Corp. Harcuvar/Server, BIOS HAVLCRB0.X64.0013.D39.1608311820 08/31/2016
    task: ffff880175389950 ti: ffff880176bec000 task.ti: ffff880176bec000
    RIP: 0010:[<ffffffff8150a83b>] [<ffffffff8150a83b>] intel_unmap+0x25b/0x260
    RSP: 0018:ffff880176bef5e8 EFLAGS: 00010296
    RAX: 0000000000000024 RBX: ffff8800773c7c88 RCX: 000000000000ce04
    RDX: 0000000080000000 RSI: 0000000000000000 RDI: 0000000000000009
    RBP: ffff880176bef638 R08: 0000000000000010 R09: 0000000000000004
    R10: ffff880175389c78 R11: 0000000000000a4f R12: ffff8800773c7868
    R13: 00000000ffffac88 R14: ffff8800773c7818 R15: 0000000000000001
    FS: 00007fef21258700(0000) GS:ffff88017b5c0000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 000000000066d6d8 CR3: 000000007118c000 CR4: 00000000003406e0
    00000000ffffac88 ffffffff8199867f ffff880176bef5f8 ffff880100000030
    ffff880176bef668 ffff8800773c7c88 ffff880178288098 ffff8800772c0010
    ffff8800773c7818 0000000000000001 ffff880176bef648 ffffffff8150a86e
    Call Trace:
    [<ffffffff8199867f>] ? printk+0x46/0x48
    [<ffffffff8150a86e>] intel_unmap_page+0xe/0x10
    [<ffffffffa039d99b>] ismt_access+0x27b/0x8fa [i2c_ismt]
    [<ffffffff81554420>] ? __pm_runtime_suspend+0xa0/0xa0
    [<ffffffff815544a0>] ? pm_suspend_timer_fn+0x80/0x80
    [<ffffffff81554420>] ? __pm_runtime_suspend+0xa0/0xa0
    [<ffffffff815544a0>] ? pm_suspend_timer_fn+0x80/0x80
    [<ffffffff8143dfd0>] ? pci_bus_read_dev_vendor_id+0xf0/0xf0
    [<ffffffff8172b36c>] i2c_smbus_xfer+0xec/0x4b0
    [<ffffffff810aa4d5>] ? vprintk_emit+0x345/0x530
    [<ffffffffa038936b>] i2cdev_ioctl_smbus+0x12b/0x240 [i2c_dev]
    [<ffffffff810aa829>] ? vprintk_default+0x29/0x40
    [<ffffffffa0389b33>] i2cdev_ioctl+0x63/0x1ec [i2c_dev]
    [<ffffffff811b04c8>] do_vfs_ioctl+0x328/0x5d0
    [<ffffffff8119d8ec>] ? vfs_write+0x11c/0x190
    [<ffffffff8109d449>] ? rt_up_read+0x19/0x20
    [<ffffffff811b07f1>] SyS_ioctl+0x81/0xa0
    [<ffffffff819a351b>] system_call_fastpath+0x16/0x6e

    This happen When run "i2cdetect -y 0" detect SMBus iSMT adapter.

    After finished I2C block read/write, when unmap the data buffer,
    a wrong device address was pass to dma_unmap_single().

    To fix this, give dma_unmap_single() the "dev" parameter, just like
    what dma_map_single() does, then unmap can find the right devices.

    Fixes: 13f35ac14cd0 ("i2c: Adding support for Intel iSMT SMBus 2.0 host controller")
    Signed-off-by: Liwei Song <>
    Reviewed-by: Andy Shevchenko <>
    Signed-off-by: Wolfram Sang <>
    Signed-off-by: Ben Hutchings <>
    drivers/i2c/busses/i2c-ismt.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/i2c/busses/i2c-ismt.c
    +++ b/drivers/i2c/busses/i2c-ismt.c
    @@ -586,7 +586,7 @@ static int ismt_access(struct i2c_adapte

    /* unmap the data buffer */
    if (dma_size != 0)
    - dma_unmap_single(&adap->dev, dma_addr, dma_size, dma_direction);
    + dma_unmap_single(dev, dma_addr, dma_size, dma_direction);

    if (unlikely(!ret)) {
    dev_err(dev, "completion wait timed out\n");
     \ /
      Last update: 2017-09-10 01:12    [W:2.211 / U:0.204 seconds]
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