linux-kernel - [PATCH -next 2/2] sata_fsl: fix warning in remove_proc_entry when rmmod sata

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Date:   Fri, 19 Nov 2021 12:11:28 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     <damien.lemoal@...nsource.wdc.com>, <axboe@...nel.dk>,
        <tj@...nel.org>, <linux-ide@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <yebin10@...wei.com>, <libaokun1@...wei.com>, <yukuai3@...wei.com>,
        Hulk Robot <hulkci@...wei.com>
Subject: [PATCH -next 2/2] sata_fsl: fix warning in remove_proc_entry when rmmod sata_fsl

Trying to remove the fsl-sata module in the PPC64 GNU/Linux
leads to the following warning:
 ------------[ cut here ]------------
 remove_proc_entry: removing non-empty directory 'irq/69',
   leaking at least 'fsl-sata[ff0221000.sata]'
 WARNING: CPU: 3 PID: 1048 at fs/proc/generic.c:722
   .remove_proc_entry+0x20c/0x220
 IRQMASK: 0
 NIP [c00000000033826c] .remove_proc_entry+0x20c/0x220
 LR [c000000000338268] .remove_proc_entry+0x208/0x220
 Call Trace:
  .remove_proc_entry+0x208/0x220 (unreliable)
  .unregister_irq_proc+0x104/0x140
  .free_desc+0x44/0xb0
  .irq_free_descs+0x9c/0xf0
  .irq_dispose_mapping+0x64/0xa0
  .sata_fsl_remove+0x58/0xa0 [sata_fsl]
  .platform_drv_remove+0x40/0x90
  .device_release_driver_internal+0x160/0x2c0
  .driver_detach+0x64/0xd0
  .bus_remove_driver+0x70/0xf0
  .driver_unregister+0x38/0x80
  .platform_driver_unregister+0x14/0x30
  .fsl_sata_driver_exit+0x18/0xa20 [sata_fsl]
 ---[ end trace 0ea876d4076908f5 ]---

The driver creates the mapping by calling irq_of_parse_and_map(),
so it also has to dispose the mapping. But the easy way out is to
simply use platform_get_irq() instead of irq_of_parse_map().

In this case the mapping is not managed by the device but by
the of core, so the device has not to dispose the mapping.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Baokun Li <libaokun1@...wei.com>
---
 drivers/ata/sata_fsl.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index 30759fd1c3a2..011daac4a14e 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -1493,7 +1493,7 @@ static int sata_fsl_probe(struct platform_device *ofdev)
 	host_priv->ssr_base = ssr_base;
 	host_priv->csr_base = csr_base;
 
-	irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
+	irq = platform_get_irq(ofdev, 0);
 	if (!irq) {
 		dev_err(&ofdev->dev, "invalid irq from platform\n");
 		goto error_exit_with_cleanup;
@@ -1570,8 +1570,6 @@ static int sata_fsl_remove(struct platform_device *ofdev)
 
 	ata_host_detach(host);
 
-	irq_dispose_mapping(host_priv->irq);
-
 	return 0;
 }
 
-- 
2.31.1