Re: [PATCH V2] i2c: ismt: fix wrong device address when unmap the data buffer

[Andy Shevchenko]

On Wed, Aug 15, 2018 at 5:26 AM, Dmitry Safonov <0x7f454c46@xxxxxxxxx> wrote:
> +Cc: stable
>
> Hi Greg, JFI:
> This one has hit a couple of times on autotests on v4.9 stable.
> The fix for BUG() is trivial, so probably worth to ship it to v4.9/v4.4/v3.18.
>

JFYI:

commit 17e83549e199d89aace7788a9f11c108671eecf5
Author: Liwei Song <liwei.song@xxxxxxxxxxxxx>
Date:   Tue Jun 13 00:59:53 2017 -0400

   i2c: ismt: fix wrong device address when unmap the data buffer


> 2017-06-13 5:59 GMT+01:00 Song liwei <liwei.song@xxxxxxxxxxxxx>:
>> From: Liwei Song <liwei.song@xxxxxxxxxxxxx>
>>
>> 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
>> Stack:
>>  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 <liwei.song@xxxxxxxxxxxxx>
>> ---
>>  drivers/i2c/busses/i2c-ismt.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c
>> index f573448..e98e44e 100644
>> --- a/drivers/i2c/busses/i2c-ismt.c
>> +++ b/drivers/i2c/busses/i2c-ismt.c
>> @@ -584,7 +584,7 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr,
>>
>>         /* 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(!time_left)) {
>>                 dev_err(dev, "completion wait timed out\n");
>> --
>> 2.7.4
>>
>
>
>
> --
>              Dmitry



-- 
With Best Regards,
Andy Shevchenko