Re: [PATCH] net: mvpp2: guard flow control update with global_tx_fc in buffer switching

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni [off-list ref]:

On Mon, 16 Mar 2026 12:31:01 -0700 you wrote:

mvpp2_bm_switch_buffers() unconditionally calls
mvpp2_bm_pool_update_priv_fc() when switching between per-cpu and
shared buffer pool modes. This function programs CM3 flow control
registers via mvpp2_cm3_read()/mvpp2_cm3_write(), which dereference
priv->cm3_base without any NULL check.

When the CM3 SRAM resource is not present in the device tree (the
third reg entry added by commit 60523583b07c ("dts: marvell: add CM3
SRAM memory to cp11x ethernet device tree")), priv->cm3_base remains
NULL and priv->global_tx_fc is false. Any operation that triggers
mvpp2_bm_switch_buffers(), for example an MTU change that crosses
the jumbo frame threshold, will crash:

[...]

Here is the summary with links:
  - net: mvpp2: guard flow control update with global_tx_fc in buffer switching
    https://git.kernel.org/netdev/net/c/8a63baadf084

You are awesome, thank you!
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