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Sat, 18 Jul 2026 16:15:24 -0700 (PDT) From: Rosen Penev To: dmaengine@vger.kernel.org Cc: Vinod Koul , Frank Li , Harninder Rai , Xuelin Shi , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] dmaengine: fsl_raid: check fsl_re_chan_probe() return value Date: Sat, 18 Jul 2026 16:15:21 -0700 Message-ID: <20260718231521.222456-1-rosenp@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit fsl_re_probe() ignores the return value of fsl_re_chan_probe() and unconditionally increments total_chans. When a channel fails to probe (for example, an IRQ mapping failure) its re_jrs[] slot is left NULL, yet total_chans still advances, so fsl_re_remove_chan() later dereferences the NULL pointer during device removal. Propagate the error, only count successfully probed channels, and guard fsl_re_remove() against NULL entries. Fixes: ad80da658bbc ("dmaengine: Driver support for FSL RaidEngine device.") Assisted-by: opencode:hy3-free Signed-off-by: Rosen Penev --- drivers/dma/fsl_raid.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/dma/fsl_raid.c b/drivers/dma/fsl_raid.c index bfaef6245695..0b0b4e8fc821 100644 --- a/drivers/dma/fsl_raid.c +++ b/drivers/dma/fsl_raid.c @@ -842,7 +842,14 @@ static int fsl_re_probe(struct platform_device *ofdev) rc = of_device_is_compatible(child, "fsl,raideng-v1.0-job-ring"); if (rc) { - fsl_re_chan_probe(ofdev, child, ridx++, off); + rc = fsl_re_chan_probe(ofdev, child, ridx, off); + if (rc) { + dev_err(dev, + "job ring %d probe failed: %d\n", + ridx, rc); + continue; + } + ridx++; re_priv->total_chans++; } } @@ -875,7 +882,8 @@ static void fsl_re_remove(struct platform_device *ofdev) /* Cleanup chan related memory areas */ for (i = 0; i < re_priv->total_chans; i++) - fsl_re_remove_chan(re_priv->re_jrs[i]); + if (re_priv->re_jrs[i]) + fsl_re_remove_chan(re_priv->re_jrs[i]); /* Unregister the driver */ dma_async_device_unregister(&re_priv->dma_dev); -- 2.55.0