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Arm SCMI/FF-A fixes for v7.2

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Fix two runtime issues in the SCMI framework. Use full 64-bit division
 when rounding range-based clock rates, avoiding divisor truncation and
 a possible divide-by-zero on 32-bit systems. Rate-limit notification
 queue-full warnings emitted from interrupt context to prevent printk
 floods and prolonged system stalls during notification bursts. Also
 correct a grammar error in the ARM_SCMI_POWER_CONTROL Kconfig help
 text.
 
 Fix the FF-A driver RX/TX buffer sizing logic to respect the maximum
 buffer size advertised by firmware, while retaining compatibility with
 older implementations that may reject PAGE_SIZE-rounded buffers.
 Also fix a NULL pointer dereference in ffa_partition_info_get() by
 rejecting NULL UUID strings before passing them to uuid_parse().
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Merge tag 'scmi-ffa-fixes-7.2' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

Arm SCMI/FF-A fixes for v7.2

Fix two runtime issues in the SCMI framework. Use full 64-bit division
when rounding range-based clock rates, avoiding divisor truncation and
a possible divide-by-zero on 32-bit systems. Rate-limit notification
queue-full warnings emitted from interrupt context to prevent printk
floods and prolonged system stalls during notification bursts. Also
correct a grammar error in the ARM_SCMI_POWER_CONTROL Kconfig help
text.

Fix the FF-A driver RX/TX buffer sizing logic to respect the maximum
buffer size advertised by firmware, while retaining compatibility with
older implementations that may reject PAGE_SIZE-rounded buffers.
Also fix a NULL pointer dereference in ffa_partition_info_get() by
rejecting NULL UUID strings before passing them to uuid_parse().

* tag 'scmi-ffa-fixes-7.2' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_scmi: Rate-limit queue-full warnings in IRQ context
  firmware: arm_scmi: Use 64-bit division for clock rate rounding
  firmware: arm_scmi: Grammar s/may needed/may be needed/
  firmware: arm_ffa: Fix NULL dereference in ffa_partition_info_get()
  firmware: arm_ffa: Respect firmware advertised RX/TX buffer size limits

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2026-07-15 22:50:24 +02:00
commit add11ea55f
4 changed files with 33 additions and 17 deletions
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