[PATCH v3 0/2] rpmsg: glink: smem: robustness and debuggability fixes

[Chunkai Deng <chunkai.deng@oss.qualcomm.com>]

This series makes two small improvements to the SMEM GLINK transport:

1. Validate the raw FIFO head/tail indices (and caller-supplied
   offset/count) against the FIFO length in the read/write helpers,
   so a broken index is rejected before it turns into an
   out-of-bounds access into the FIFO.

2. Pass dev_name(&smem->dev) as the IRQ name instead of the static
   string "glink-smem".  On platforms with multiple remoteprocs each
   SMEM GLINK instance registers its own IRQ, and the unique device
   name makes each entry in /proc/interrupts identifiable without
   adding a new struct field.

Signed-off-by: Chunkai Deng <chunkai.deng@oss.qualcomm.com>
---
Changes in v3:
- Rework the FIFO-index patch per review: validate the raw head/tail
  values (not a derived length or post-normalized index), use
  dev_warn_ratelimited() for remote-written indices and WARN_ON_ONCE()
  for local ones, and bounds-check offset/count and hlen/dlen.
  Retitled to "rpmsg: glink: smem: Validate FIFO indices before use".
- No changes to the IRQ-name patch; carrying Dmitry's Reviewed-by.
- Link to v2: https://patch.msgid.link/20260617-rpmsg-improvements-v2-0-477d4eb569dc@oss.qualcomm.com

Changes in v2:
- Drop the modulo patch ("rpmsg: glink: smem: Use modulo for FIFO
  tail wrap-around in rx_advance"); per review, it papers over an
  unreachable scenario without restoring a valid protocol state.
  Proper RX-side validation of chunk_size against rx_pipe->length
  will be sent as a separate patch.
- "rpmsg: glink: smem: Add WARN_ON_ONCE for FIFO index invariants":
  - Drop the trailing comma after "skipped" in the commit message
    body (per review).
  - Add Fixes: caf989c350e8 ("rpmsg: glink: Introduce glink smem
    based transport") and Cc: stable@vger.kernel.org (per review).
- Carry Dmitry's Reviewed-by on "rpmsg: glink: smem: Use device
  name as IRQ name" (no code changes since v1).
- Link to v1: https://patch.msgid.link/20260603-rpmsg-improvements-v1-0-dcfc22ed69f7@oss.qualcomm.com

---
Chunkai Deng (2):
      rpmsg: glink: smem: Use device name as IRQ name
      rpmsg: glink: smem: Validate FIFO indices before use

 drivers/rpmsg/qcom_glink_smem.c | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)
---
base-commit: f7af91adc230aa99e23330ecf85bc9badd9780ad
change-id: 20260601-rpmsg-improvements-643a6e133f66

Best regards,
--  
Chunkai Deng <chunkai.deng@oss.qualcomm.com>