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SubjectRe: [PATCH v2 2/4] i2c: designware: Ensure tx_buf_len is nonzero for SMBus block reads
On 9/17/20 8:22 AM, Sultan Alsawaf wrote:
> From: Sultan Alsawaf <>
> The point of adding a byte to len in i2c_dw_recv_len() is to make sure
> that tx_buf_len is nonzero, so that i2c_dw_xfer_msg() can let the i2c
> controller know that the i2c transaction can end. Otherwise, the i2c
> controller will think that the transaction can never end for block
> reads, which results in the stop-detection bit never being set and thus
> the transaction timing out.
> Adding a byte to len is not a reliable way to do this though; sometimes
> it lets tx_buf_len become zero, which results in the scenario described
> above. Therefore, just directly ensure tx_buf_len cannot be zero to fix
> the issue.
> Fixes: c3ae106050b9 ("i2c: designware: Implement support for SMBus block read and write")
> Signed-off-by: Sultan Alsawaf <>
> ---
> drivers/i2c/busses/i2c-designware-master.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
Were other patches in series dropped somewhere? I received only this.


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