linux.git/drivers/bus/mhi, branch master

Replace by more specific (c files)

2026-07-03T05:38:17+00:00

Replace the #include of  by the more specific
 where applicable. For most cases the include
can be dropped completely, only a few drivers need one or two headers
added.

Acked-by: Danilo Krummrich 
Acked-by: Takashi Sakamoto 
Acked-by: Bjorn Helgaas 
Link: https://patch.msgid.link/1a3f2007c5c5dcf555c09a4035ce3ae8ef1b6c49.1782808461.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König (The Capable Hub)

bus: mhi: host: pci_generic: Fix the physical function check

2026-05-27T15:43:11+00:00

Commit b4d01c5b9a9d ("bus: mhi: host: pci_generic: Read SUBSYSTEM_VENDOR_ID
for VF's to check status") added the check for physical function by
checking for 'pdev->is_physfn. But 'pdev->is_physfn' is only set for the
physical function of a SR-IOV capable device. But for the non-SR-IOV device
this variable will be 0. So this check ended up breaking the health check
functionality for all non-SR-IOV devices.

Fix it by checking for '!pdev->is_virtfn' to make sure that the check is
only skipped for virtual functions.

Cc: stable@vger.kernel.org # 6.18
Reported-by: Slark Xiao 
Tested-by: Slark Xiao 
Fixes: b4d01c5b9a9d ("bus: mhi: host: pci_generic: Read SUBSYSTEM_VENDOR_ID for VF's to check status")
Signed-off-by: Manivannan Sadhasivam

bus: mhi: ep: Protect mhi_ep_handle_syserr() in the error path

2026-05-12T14:33:57+00:00

All the callers of mhi_ep_handle_syserr() except mhi_ep_process_cmd_ring()
are holding the 'state_lock' to avoid the race in setting the MHI state. So
do the same in mhi_ep_process_cmd_ring() for sanity.

Fixes: e827569062a8 ("bus: mhi: ep: Add support for processing command rings")
Cc: stable@vger.kernel.org # 5.18
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/20260302085612.18725-1-manivannan.sadhasivam@oss.qualcomm.com

bus: mhi: host: pci_generic: Add Telit FE910C04 modem support

2026-05-12T14:32:34+00:00

Add SDX35 based modem Telit FE910C04, reusing FN920C04 configuration.

01:00.0 Unassigned class [ff00]: Qualcomm Device 011a
        Subsystem: Device 1c5d:202a

Signed-off-by: Daniele Palmas 
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/20260512112458.1048999-1-dnlplm@gmail.com

bus: mhi: ep: Add missing state_lock protection for mhi_state access

2026-05-12T14:30:53+00:00

The mhi_cntrl->mhi_state field should be protected by state_lock to
ensure atomic state transitions. However, mhi_ep_power_up() access
mhi_state without holding this lock, which can race with concurrent state
transitions and lead to state corruption.

Add proper state_lock protection around mhi_state access.

Fixes: fb3a26b7e8af ("bus: mhi: ep: Add support for powering up the MHI endpoint stack")
Fixes: f7d0806bdb1b3 ("bus: mhi: ep: Add support for handling SYS_ERR condition")
Signed-off-by: Sumit Kumar 
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/20260414-reset_worker_deadlock-v2-2-42fd682b45db@oss.qualcomm.com

bus: mhi: ep: Fix potential deadlock in mhi_ep_reset_worker()

2026-05-12T14:30:53+00:00

There is a potential deadlock scenario in mhi_ep_reset_worker() where
the state_lock mutex is acquired twice in the same call chain:

mhi_ep_reset_worker()
  mutex_lock(&mhi_cntrl->state_lock)
    mhi_ep_power_up()
      mhi_ep_set_ready_state()
        mutex_lock(&mhi_cntrl->state_lock)  <- Deadlock

Fix this by releasing the state_lock before calling mhi_ep_power_up().
The lock is only needed to protect current MHI state read operation. The
lock can be safely released before proceeding with the power up sequence.

Fixes: 7a97b6b47353 ("bus: mhi: ep: Add support for handling MHI_RESET")
Signed-off-by: Sumit Kumar 
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/20260414-reset_worker_deadlock-v2-1-42fd682b45db@oss.qualcomm.com

bus: mhi: host: pci_generic: Round up nr_irqs to power of two

2026-05-12T14:27:13+00:00

When an MHI device uses standard MSI, the PCI core requires the allocated
number of vectors to be a strict power of two. But devices will only ask
for the irqs they need, so they might not be properly aligned.

Make sure a power-of-2 number of vectors is requested.

Signed-off-by: Javier Achirica 
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/CACixm21q7b_diEx5COZxVZm9EhZ0hnakM_WBjEWcCsznfWeniw@mail.gmail.com

bus: mhi: host: pci_generic: Add Telit FE912C04 modem support

2026-04-03T06:14:25+00:00

Add SDX35 based modem Telit FE912C04, reusing FN920C04 configuration.

01:00.0 Unassigned class [ff00]: Qualcomm Device 011a
        Subsystem: Device 1c5d:2045

Signed-off-by: Daniele Palmas 
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/20260323122837.3406521-1-dnlplm@gmail.com

bus: mhi: ep: Test for non-zero return value where applicable

2026-03-17T10:05:20+00:00

Instead of testing for negative error code, just test for non-zero return
for cases where there is no positive return value. This helps to maintain
code uniformity.

No functional change.

Reported-by: Bjorn Helgaas 
Closes: https://lore.kernel.org/linux-pci/20260227191510.GA3904799@bhelgaas
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/20260302055021.8616-1-manivannan.sadhasivam@oss.qualcomm.com

bus: mhi: host: Use kzalloc_flex

2026-03-17T10:04:47+00:00

Change kzalloc + kzalloc to just kzalloc with a flexible array member.

Add __counted_by for extra runtime analysis when requested.

Move counting assignment immediately after allocation as required by
__counted_by.

Move mhi_buf definition as a complete definition as needed for flex
arrays. It's not a pointer anymore.

Signed-off-by: Rosen Penev 
[mani: squashed https://lore.kernel.org/mhi/20260317-mhi-invalid-free-mhi-buffers-v1-1-8418a3ad604f@oss.qualcomm.com]
Signed-off-by: Manivannan Sadhasivam 
Link: https://patch.msgid.link/20260312045921.7663-1-rosenp@gmail.com