On 2021/11/23 10:41, Baokun Li wrote:
> 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(). Also
> we should adapt return value checking and propagate error values.
>
> 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.
>
> Fixes: faf0b2e5afe7 ("drivers/ata: add support to Freescale 3.0Gbps SATA Controller")
> Cc: stable@xxxxxxxxxxxxxxx
> Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
> Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
> ---
> V1->V2:
> Adapt return value checking and propagate error values.
> V2->V3:
> Add fixed and CC stable.
>
> drivers/ata/sata_fsl.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
> index 2eb216792695..8e7c49793f91 100644
> --- a/drivers/ata/sata_fsl.c
> +++ b/drivers/ata/sata_fsl.c
> @@ -1490,8 +1490,9 @@ 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);
> - if (!irq) {
> + irq = platform_get_irq(ofdev, 0);
> + if (irq < 0) {
> + retval = irq;
> dev_err(&ofdev->dev, "invalid irq from platform\n");
Nit: platform_get_irq() already prints an error message in case of failure. So
while at it, you could remove this one here.
> goto error_exit_with_cleanup;
> }
> @@ -1567,8 +1568,6 @@ static int sata_fsl_remove(struct platform_device *ofdev)
>
> ata_host_detach(host);
>
> - irq_dispose_mapping(host_priv->irq);
> -
> return 0;
> }
>
>
--
Damien Le Moal
Western Digital Research
