Re: [PATCH v2] dmaengine: qcom: gpi: Fix channel cleanup in unwind path

[Mukesh Savaliya <mukesh.savaliya@oss.qualcomm.com>]

On 8/10/2026 12:21 PM, Aniket Randive wrote:
> The gpi_ch_init() error path has three bugs: sibling channels are
May be instead of three bugs, can actually mention issues
"start here mentioning  the three problems first in generic way."
is what i mentioned, not like write numbers :) .

May be misunderstood.

> not fully reset and deallocated, the event ring pm_state is left
> stale after being freed, and ch_ring leaks if gpi_ch_init() fails.
> 
> Fix the unwind loops in error_start_chan and error_alloc_chan to
> iterate over gpii->gchan[i] instead of the original gchan pointer,
> so each sibling channel is properly reset and deallocated.
> 
> Restore pm_state to DISABLE_STATE after freeing the event ring, so
> gpi_free_chan_resources() does not attempt to free an already freed
> ring or issue a redundant EV_CMD_DEALLOC.
> 
> Free ch_ring in gpi_alloc_chan_resources() if gpi_ch_init() fails,
> since the ring is allocated before the call and would otherwise leak.
> 
> Signed-off-by: Aniket Randive <aniket.randive@oss.qualcomm.com>
> ---

Review if below looks fine, you may modify/change if anything wrong.

you may wait for other's review and make changes together. Do not upload 
v3 only for this immediately.

Title: Fix resource leaks in gpi_ch_init() error paths

The gpi_ch_init() unwind paths do not clean up resources correctly when
channel initialization fails.

The error_start_chan and error_alloc_chan labels iterate over the
original channel pointer instead of the channels stored in gpii->gchan[].
As a result, previously initialized sibling channels are not properly
reset and deallocated.

The event ring PM state is also left unchanged after the ring is freed.
Subsequent cleanup through gpi_free_chan_resources() may therefore
attempt to free the already released ring and issue a redundant
EV_CMD_DEALLOC command.

Additionally, gpi_alloc_chan_resources() allocates ch_ring before
calling gpi_ch_init(), but does not release it when gpi_ch_init() fails,
resulting in a memory leak.

Fix the unwind paths to operate on the correct channels, restore the
event ring PM state after freeing the ring, and release ch_ring when
channel initialization fails.