linux-kernel - Re: [PATCH v3] wifi: ath11k: move .max_tx_ring to struct ath11k_hw_hal

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Message-ID: <6267675.44csPzL39Z@nukework.gtech>
Date: Wed, 14 Jan 2026 22:43:56 -0600
From: "Alex G." <mr.nuke.me@...il.com>
To: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@....qualcomm.com>,
 jjohnson@...nel.org, ath11k@...ts.infradead.org,
 Jeff Johnson <jeff.johnson@....qualcomm.com>
Cc: baochen.qiang@....qualcomm.com, linux-wireless@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject:
 Re: [PATCH v3] wifi: ath11k: move .max_tx_ring to struct ath11k_hw_hal_params

On Wednesday, January 14, 2026 3:59:09 PM CST Jeff Johnson wrote:
> On 1/14/2026 1:29 PM, Alex G. wrote:
> > On Wednesday, January 14, 2026 11:24:19 AM CST Jeff Johnson wrote:
> >> On 1/12/2026 11:00 PM, Vasanthakumar Thiagarajan wrote:
> >>> On 12/28/2025 8:44 PM, Alexandru Gagniuc wrote:
> >>>> ".max_tx_ring" is an upper bounds to indexing ".tcl2wbm_rbm_map". It
> >>>> is initialized in, core.c, a different file than the array. This
> >>>> spaghetti-like relation is fragile and not obvious. Accidentally
> >>>> setting ".max_tx_ring" too high leads to a hard to track out-of-
> >>>> bounds access and memory corruption.
> >>>> 
> >>>> There is a small ambiguity on the meaning of "max_tx_ring":
> >>>>   - The highest ring, max=3 implies there are 4 rings (0, 1, 2, 3)
> >>>>   - The highest number to use for array indexing (there are 3 rings)
> >>>> 
> >>>> Clarify this dependency by moving ".max_tx_ring" adjacent to the array
> >>>> ".tcl2wbm_rbm_map", and name it "num_tx_rings". Use ARRAY_SIZE()
> >>>> instead of #defines to initialize the length field.
> >>>> 
> >>>> The ath11k_hw_hal_params_qca6390 uses fewer num_tx_rings than its map,
> >>>> so use a constant to express the correct value. Add a static_assert()
> >>>> to fail compilation if the constant is accidentally set too high.
> >>> 
> >>> Text related to static_assert to be removed accordingly.
> > 
> > Hi Jeff,
> > 
> >> I removed the last sentence in 'pending', please check:
> >> 
> >> https://git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git/commit/?h=pen
> >> din g&id=26bb149b5e011b0f73f7b74421589cbd38e3304b
> > 
> > Re-reading the commit message, I think it makes sense to also remove the
> > sentence "The ath11k_hw_hal_params_qca6390 uses fewer num_tx_rings than
> > its
> > map, so use a constant to express the correct value.". Do you think it's
> > worth submitting a v4 with this minor change?
> > 
> > Alex
> 
> No need to submit a v4. I can make that change in 'pending'

Thank you!

> /jeff