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X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR11MB8540 X-OriginatorOrg: intel.com On 22/09/2026 02:06, Sam Agazaryan wrote: > Currently only the amd and svc I3C controller drivers populate > i3c_xfer.actual_len on reads, while dw-i3c-master and mipi-i3c-hci > overwrite i3c_xfer.len with the received byte count and leave actual_len > as 0. Because of this inconsistency, mctp-i3c reads xfer.len instead of > xfer.actual_len, making it fail on controllers that do not mutate len. > > Unify read length reporting across the subsystem: > - Clarify in that actual_len reflects the actual > number of bytes transferred on reads. > - Update adi, cdns, dw, mipi-i3c-hci, and renesas controller drivers to > populate actual_len on read transfers without mutating len. > - Update mctp-i3c to read xfer.actual_len instead of xfer.len. > > Co-developed-by: Meagan Lloyd > Signed-off-by: Meagan Lloyd > Signed-off-by: Sam Agazaryan Looks good. 1 issue from Sashiko: https://sashiko.dev/#/patchset/20260921230603.2518652-1-samagazaryan%40google.com?part=3 Also i3c_dev_do_xfers_locked() should probably clamp actual_len to len. > --- > drivers/i3c/master/adi-i3c-master.c | 5 ++++- > drivers/i3c/master/dw-i3c-master.c | 2 +- > drivers/i3c/master/i3c-master-cdns.c | 5 ++++- > drivers/i3c/master/mipi-i3c-hci/core.c | 2 +- > drivers/i3c/master/renesas-i3c.c | 3 +++ > drivers/net/mctp/mctp-i3c.c | 10 +++++----- > include/linux/i3c/device.h | 2 +- > 7 files changed, 19 insertions(+), 10 deletions(-) > > diff --git a/drivers/i3c/master/adi-i3c-master.c b/drivers/i3c/master/adi-i3c-master.c > index b35386260350..d033bfd4ecc2 100644 > --- a/drivers/i3c/master/adi-i3c-master.c > +++ b/drivers/i3c/master/adi-i3c-master.c > @@ -412,8 +412,11 @@ static int adi_i3c_master_i3c_xfers(struct i3c_dev_desc *dev, > > ret = xfer->ret; > > - for (i = 0; i < nxfers; i++) > + for (i = 0; i < nxfers; i++) { > xfers[i].err = adi_i3c_cmd_get_err(&xfer->cmds[i]); > + if (xfers[i].rnw) > + xfers[i].actual_len = xfer->cmds[i].rx_len; > + } > > return ret; > } > diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c > index 4563d8761ba0..28e8eb293747 100644 > --- a/drivers/i3c/master/dw-i3c-master.c > +++ b/drivers/i3c/master/dw-i3c-master.c > @@ -1029,7 +1029,7 @@ static int dw_i3c_master_i3c_xfers(struct i3c_dev_desc *dev, > struct dw_i3c_cmd *cmd = &xfer->cmds[i]; > > if (i3c_xfers[i].rnw) > - i3c_xfers[i].len = cmd->rx_len; > + i3c_xfers[i].actual_len = cmd->rx_len; > } > > ret = xfer->ret; > diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c > index 2d98c1ce9b12..331062c10b31 100644 > --- a/drivers/i3c/master/i3c-master-cdns.c > +++ b/drivers/i3c/master/i3c-master-cdns.c > @@ -795,8 +795,11 @@ static int cdns_i3c_master_i3c_xfers(struct i3c_dev_desc *dev, > > ret = cdns_xfer->ret; > > - for (i = 0; i < nxfers; i++) > + for (i = 0; i < nxfers; i++) { > xfers[i].err = cdns_i3c_cmd_get_err(&cdns_xfer->cmds[i]); > + if (xfers[i].rnw) > + xfers[i].actual_len = cdns_xfer->cmds[i].rx_len; > + } > > cdns_i3c_master_free_xfer(cdns_xfer); > > diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c > index dadf049bd4b5..f74c02fab9e3 100644 > --- a/drivers/i3c/master/mipi-i3c-hci/core.c > +++ b/drivers/i3c/master/mipi-i3c-hci/core.c > @@ -509,7 +509,7 @@ static int i3c_hci_i3c_xfers(struct i3c_dev_desc *dev, > goto out; > for (i = 0; i < nxfers; i++) { > if (i3c_xfers[i].rnw) > - i3c_xfers[i].len = RESP_DATA_LENGTH(xfer[i].response); > + i3c_xfers[i].actual_len = RESP_DATA_LENGTH(xfer[i].response); > if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) { > ret = -EIO; > goto out; > diff --git a/drivers/i3c/master/renesas-i3c.c b/drivers/i3c/master/renesas-i3c.c > index 28c0927a0179..a3dcb4cd9b0e 100644 > --- a/drivers/i3c/master/renesas-i3c.c > +++ b/drivers/i3c/master/renesas-i3c.c > @@ -918,6 +918,9 @@ static int renesas_i3c_i3c_xfers(struct i3c_dev_desc *dev, struct i3c_xfer *i3c_ > time_left = renesas_i3c_wait_xfer(i3c, xfer); > if (!time_left) > xfer_failed = true; > + > + if (i3c_xfers[i].rnw) > + i3c_xfers[i].actual_len = cmd->rx_count; > } > > if (xfer_failed) > diff --git a/drivers/net/mctp/mctp-i3c.c b/drivers/net/mctp/mctp-i3c.c > index 6d2bbae7477b..5f94c11a1712 100644 > --- a/drivers/net/mctp/mctp-i3c.c > +++ b/drivers/net/mctp/mctp-i3c.c > @@ -131,12 +131,12 @@ static int mctp_i3c_read(struct mctp_i3c_device *mi) > if (rc < 0) > goto err; > > - if (WARN_ON_ONCE(xfer.len > mi->mrl)) { > + if (WARN_ON_ONCE(xfer.actual_len > mi->mrl)) { > /* Bad i3c bus driver */ > rc = -EIO; > goto err; > } > - if (xfer.len < MCTP_I3C_MINLEN) { > + if (xfer.actual_len < MCTP_I3C_MINLEN) { > stats->rx_length_errors++; > rc = -EIO; > goto err; > @@ -145,15 +145,15 @@ static int mctp_i3c_read(struct mctp_i3c_device *mi) > /* check PEC, including address byte */ > addr = mi->addr << 1 | 1; > pec = i2c_smbus_pec(0, &addr, 1); > - pec = i2c_smbus_pec(pec, xfer.data.in, xfer.len - 1); > - if (pec != ((u8 *)xfer.data.in)[xfer.len - 1]) { > + pec = i2c_smbus_pec(pec, xfer.data.in, xfer.actual_len - 1); > + if (pec != ((u8 *)xfer.data.in)[xfer.actual_len - 1]) { > stats->rx_crc_errors++; > rc = -EINVAL; > goto err; > } > > /* Remove PEC */ > - skb_trim(skb, xfer.len - 1); > + skb_trim(skb, xfer.actual_len - 1); > > cb = __mctp_cb(skb); > cb->halen = PID_SIZE; > diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h > index 971d53349b6f..f868a7bf2bc9 100644 > --- a/include/linux/i3c/device.h > +++ b/include/linux/i3c/device.h > @@ -59,7 +59,7 @@ enum i3c_xfer_mode { > * @rnw: encodes the transfer direction. true for a read, false for a write > * @cmd: Read/Write command in HDR mode, read: 0x80 - 0xff, write: 0x00 - 0x7f > * @len: transfer length in bytes of the transfer > - * @actual_len: actual length in bytes are transferred by the controller > + * @actual_len: actual length in bytes transferred by the controller on read > * @data: input/output buffer > * @data.in: input buffer. Must point to a DMA-able buffer > * @data.out: output buffer. Must point to a DMA-able buffer