linux-kernel - [PATCH v5 1/6] mtd: rawnand: stm32_fmc2: do not display errors if the driver is deferred

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Date:   Fri, 12 Jun 2020 17:22:37 +0200
From:   Christophe Kerello <christophe.kerello@...com>
To:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>, <arnd@...aro.org>,
        <alexandre.torgue@...com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <devicetree@...r.kernel.org>, <marex@...x.de>,
        Christophe Kerello <christophe.kerello@...com>
Subject: [PATCH v5 1/6] mtd: rawnand: stm32_fmc2: do not display errors if the driver is deferred

A MDMA issue has been solved on Kernel 5.7. The effect of this fix is
that the MDMA driver is now deferred and the FMC2 NFC driver is also
deferred. All is working fine but there is a FMC2 log in the console:
stm32_fmc2_nfc 58002000.nand-controller: failed to request tx DMA
channel: -517

This patch removes the display of this log in the console in case of
this error is -EPROBE_DEFER.

Signed-off-by: Christophe Kerello <christophe.kerello@...com>
---
 drivers/mtd/nand/raw/stm32_fmc2_nand.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index 65c9d17..e7b706b 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -1570,7 +1570,7 @@ static int stm32_fmc2_nfc_dma_setup(struct stm32_fmc2_nfc *nfc)
 	nfc->dma_tx_ch = dma_request_chan(nfc->dev, "tx");
 	if (IS_ERR(nfc->dma_tx_ch)) {
 		ret = PTR_ERR(nfc->dma_tx_ch);
-		if (ret != -ENODEV)
+		if (ret != -ENODEV && ret != -EPROBE_DEFER)
 			dev_err(nfc->dev,
 				"failed to request tx DMA channel: %d\n", ret);
 		nfc->dma_tx_ch = NULL;
@@ -1580,7 +1580,7 @@ static int stm32_fmc2_nfc_dma_setup(struct stm32_fmc2_nfc *nfc)
 	nfc->dma_rx_ch = dma_request_chan(nfc->dev, "rx");
 	if (IS_ERR(nfc->dma_rx_ch)) {
 		ret = PTR_ERR(nfc->dma_rx_ch);
-		if (ret != -ENODEV)
+		if (ret != -ENODEV && ret != -EPROBE_DEFER)
 			dev_err(nfc->dev,
 				"failed to request rx DMA channel: %d\n", ret);
 		nfc->dma_rx_ch = NULL;
@@ -1590,7 +1590,7 @@ static int stm32_fmc2_nfc_dma_setup(struct stm32_fmc2_nfc *nfc)
 	nfc->dma_ecc_ch = dma_request_chan(nfc->dev, "ecc");
 	if (IS_ERR(nfc->dma_ecc_ch)) {
 		ret = PTR_ERR(nfc->dma_ecc_ch);
-		if (ret != -ENODEV)
+		if (ret != -ENODEV && ret != -EPROBE_DEFER)
 			dev_err(nfc->dev,
 				"failed to request ecc DMA channel: %d\n", ret);
 		nfc->dma_ecc_ch = NULL;
-- 
1.9.1