linux.git/drivers/net/wwan, branch v6.8

net: wwan: qcom_bam_dmux: Convert to platform remove callback returning void

2023-12-06T03:54:44+00:00

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Reviewed-by: Sergey Ryazanov 
Link: https://lore.kernel.org/r/20231117095922.876489-9-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König 
Link: https://lore.kernel.org/r/49795ee930be6a9a24565e5e7133e6f8383ab532.1701713943.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Jakub Kicinski

net: wwan: replace deprecated strncpy with strscpy

2023-10-21T01:15:05+00:00

strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

We expect chinfo.name to be NUL-terminated based on its use with format
strings and sprintf:
rpmsg/rpmsg_char.c
165:            dev_err(dev, "failed to open %s\n", eptdev->chinfo.name);
368:    return sprintf(buf, "%s\n", eptdev->chinfo.name);

... and with strcmp():
|  static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
|  						    rpmsg_rx_cb_t cb,
|  						    void *priv,
|  						    struct rpmsg_channel_info
|  									chinfo)
|  ...
|  const char *name = chinfo.name;
|  ...
|  		if (!strcmp(channel->name, name))

Since chinfo is initialized as such (just above the strscpy()):

|       struct rpmsg_channel_info chinfo = {
|               .src = rpwwan->rpdev->src,
|               .dst = RPMSG_ADDR_ANY,
|       };

... we know other members are zero-initialized. This means no
NUL-padding is required (as any NUL-byte assignments are redundant).

Considering the above, a suitable replacement is `strscpy` due to the
fact that it guarantees NUL-termination on the destination buffer
without unnecessarily NUL-padding.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Signed-off-by: Justin Stitt 
Reviewed-by: Kees Cook 
Link: https://lore.kernel.org/r/20231019-strncpy-drivers-net-wwan-rpmsg_wwan_ctrl-c-v2-1-ecf9b5a39430@google.com
Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2023-10-19T20:29:01+00:00

Cross-merge networking fixes after downstream PR.

net/mac80211/key.c
  02e0e426a2fb ("wifi: mac80211: fix error path key leak")
  2a8b665e6bcc ("wifi: mac80211: remove key_mtx")
  7d6904bf26b9 ("Merge wireless into wireless-next")
https://lore.kernel.org/all/20231012113648.46eea5ec@canb.auug.org.au/

Adjacent changes:

drivers/net/ethernet/ti/Kconfig
  a602ee3176a8 ("net: ethernet: ti: Fix mixed module-builtin object")
  98bdeae9502b ("net: cpmac: remove driver to prepare for platform removal")

Signed-off-by: Jakub Kicinski

drivers: net: wwan: iosm: Fixed multiple typos in multiple files

2023-10-19T00:45:44+00:00

iosm_ipc_chnl_cfg.h: Fixed typo
iosm_ipc_imem_ops.h: Fixed typo
iosm_ipc_mux.h: Fixed typo
iosm_ipc_pm.h: Fixed typo
iosm_ipc_port.h: Fixed typo
iosm_ipc_trace.h: Fixed typo

Signed-off-by: Muhammad Muzammil 
Reviewed-by: Simon Horman 
Link: https://lore.kernel.org/r/20231014121407.10012-1-m.muzzammilashraf@gmail.com
Signed-off-by: Jakub Kicinski

Revert "net: wwan: iosm: enable runtime pm support for 7560"

2023-10-18T10:08:52+00:00

Runtime power management support breaks Intel LTE modem where dmesg dump
showes timeout errors:

```
[   72.027442] iosm 0000:01:00.0: msg timeout
[   72.531638] iosm 0000:01:00.0: msg timeout
[   73.035414] iosm 0000:01:00.0: msg timeout
[   73.540359] iosm 0000:01:00.0: msg timeout
```

Furthermore, when shutting down with `poweroff` and modem attached, the
system rebooted instead of powering down as expected. The modem works
again only after power cycling.

Revert runtime power management support for IOSM driver as introduced by
commit e4f5073d53be6c ("net: wwan: iosm: enable runtime pm support for
7560").

Fixes: e4f5073d53be ("net: wwan: iosm: enable runtime pm support for 7560")
Reported-by: Martin 
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217996
Link: https://lore.kernel.org/r/267abf02-4b60-4a2e-92cd-709e3da6f7d3@gmail.com/
Signed-off-by: Bagas Sanjaya 
Reviewed-by: Loic Poulain 
Signed-off-by: David S. Miller

drivers: net: wwan: wwan_core.c: resolved spelling mistake

2023-10-16T23:39:00+00:00

resolved typing mistake from devce to device

Signed-off-by: Muhammad Muzammil 
Reviewed-by: Simon Horman 
Link: https://lore.kernel.org/r/20231013042304.7881-1-m.muzzammilashraf@gmail.com
Signed-off-by: Jakub Kicinski

net: wwan: t7xx: Add __counted_by for struct t7xx_fsm_event and use struct_size()

2023-10-13T09:11:48+00:00

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

While there, use struct_size() helper, instead of the open-coded
version, to calculate the size for the allocation of the whole
flexible structure, including of course, the flexible-array member.

This code was found with the help of Coccinelle, and audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva 
Reviewed-by: Kees Cook 
Signed-off-by: David S. Miller

netdev: replace napi_reschedule with napi_schedule

2023-10-12T00:28:06+00:00

Now that napi_schedule return a bool, we can drop napi_reschedule that
does the same exact function. The function comes from a very old commit
bfe13f54f502 ("ibm_emac: Convert to use napi_struct independent of struct
net_device") and the purpose is actually deprecated in favour of
different logic.

Convert every user of napi_reschedule to napi_schedule.

Signed-off-by: Christian Marangi 
Acked-by: Jeff Johnson  # ath10k
Acked-by: Nick Child  # ibm
Acked-by: Marc Kleine-Budde  # for can/dev/rx-offload.c
Reviewed-by: Eric Dumazet 
Acked-by: Tariq Toukan 
Link: https://lore.kernel.org/r/20231009133754.9834-3-ansuelsmth@gmail.com
Signed-off-by: Jakub Kicinski

wwan: core: Use the bitmap API to allocate bitmaps

2023-09-12T09:49:22+00:00

Use bitmap_zalloc() and bitmap_free() instead of hand-writing them.
It is less verbose and it improves the type checking and semantic.

While at it, add missing header inclusion (should be bitops.h,
but with the above change it becomes bitmap.h).

Reviewed-by: Loic Poulain 
Reviewed-by: Sergey Ryazanov 
Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20230911131618.4159437-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Paolo Abeni

net: wwan: t7xx: Add AP CLDMA

2023-07-13T00:16:56+00:00

At this moment with the current status, t7xx is not functional due to
problems like this after connection, if there is no activity:
[   57.370534] mtk_t7xx 0000:72:00.0: [PM] SAP suspend error: -110
[   57.370581] mtk_t7xx 0000:72:00.0: can't suspend
    (t7xx_pci_pm_runtime_suspend [mtk_t7xx] returned -110)
because after this, the traffic no longer works.

The complete series 'net: wwan: t7xx: fw flashing & coredump support'
was reverted because of issues with the pci implementation.
In order to have at least the modem working, it would be enough if just
the first commit of the series is re-applied:
d20ef656f994 net: wwan: t7xx: Add AP CLDMA
With that, the Application Processor would be controlled, correctly
suspended and the commented problems would be fixed (I am testing here
like this with no related issue).

This commit is independent of the others and not related to the
commented pci implementation for the new features: fw flashing and
coredump collection.

Use v2 patch version of d20ef656f994 as JinJian Song suggests
(https://patchwork.kernel.org/project/netdevbpf/patch/20230105154215.198828-1-m.chetan.kumar@linux.intel.com/).

Original text from the commit that would be re-applied:

    d20ef656f994 net: wwan: t7xx: Add AP CLDMA
    Author: Haijun Liu 
    Date:   Tue Aug 16 09:53:28 2022 +0530

    The t7xx device contains two Cross Layer DMA (CLDMA) interfaces to
    communicate with AP and Modem processors respectively. So far only
    MD-CLDMA was being used, this patch enables AP-CLDMA.

    Rename small Application Processor (sAP) to AP.

    Signed-off-by: Haijun Liu 
    Co-developed-by: Madhusmita Sahu 
    Signed-off-by: Madhusmita Sahu 
    Signed-off-by: Moises Veleta 
    Signed-off-by: Devegowda Chandrashekar 
    Signed-off-by: M Chetan Kumar 
    Reviewed-by: Ilpo Järvinen 
    Reviewed-by: Sergey Ryazanov 
    Reviewed-by: Jesse Brandeburg 

Signed-off-by: Jose Ignacio Tornos Martinez 
Reviewed-by: Simon Horman 
Link: https://lore.kernel.org/r/20230711062817.6108-1-jtornosm@redhat.com
Signed-off-by: Jakub Kicinski