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Subject: Re: [PATCH] staging: comedi: replace slash in name
To:     Tong Zhang <ztong0001@gmail.com>,
        H Hartley Sweeten <hsweeten@visionengravers.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Alexander A. Klimov" <grandmaster@al2klimov.de>,
        devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
References: <20210314035757.2740146-1-ztong0001@gmail.com>
From:   Ian Abbott <abbotti@mev.co.uk>
Organization: MEV Ltd.
Message-ID: <5d7a5e1c-35ab-58cb-ebcd-da5b280c802e@mev.co.uk>
Date:   Mon, 15 Mar 2021 10:44:32 +0000
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On 14/03/2021 03:57, Tong Zhang wrote:
> request_irq() wont accept a name which contains slash so we need to
> repalce it with something else -- otherwise it will trigger a warning
> and the entry in /proc/irq/ will not be created
> 
> [    1.565966] name 'pci-das6402/16'
> [    1.566149] WARNING: CPU: 0 PID: 184 at fs/proc/generic.c:180 __xlate_proc_name+0x93/0xb0
> [    1.568923] RIP: 0010:__xlate_proc_name+0x93/0xb0
> [    1.574200] Call Trace:
> [    1.574722]  proc_mkdir+0x18/0x20
> [    1.576629]  request_threaded_irq+0xfe/0x160
> [    1.576859]  auto_attach+0x60a/0xc40 [cb_pcidas64]
> 
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> ---
>  drivers/staging/comedi/drivers/cb_pcidas64.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/comedi/drivers/cb_pcidas64.c b/drivers/staging/comedi/drivers/cb_pcidas64.c
> index fa987bb0e7cd..662d6ffb8f60 100644
> --- a/drivers/staging/comedi/drivers/cb_pcidas64.c
> +++ b/drivers/staging/comedi/drivers/cb_pcidas64.c
> @@ -677,7 +677,7 @@ static const int bytes_in_sample = 2;
>  
>  static const struct pcidas64_board pcidas64_boards[] = {
>  	[BOARD_PCIDAS6402_16] = {
> -		.name		= "pci-das6402/16",
> +		.name		= "pci-das6402-16",
>  		.ai_se_chans	= 64,
>  		.ai_bits	= 16,
>  		.ai_speed	= 5000,
> @@ -693,7 +693,7 @@ static const struct pcidas64_board pcidas64_boards[] = {
>  		.has_8255	= 1,
>  	},
>  	[BOARD_PCIDAS6402_12] = {
> -		.name		= "pci-das6402/12",	/* XXX check */
> +		.name		= "pci-das6402-12",	/* XXX check */
>  		.ai_se_chans	= 64,
>  		.ai_bits	= 12,
>  		.ai_speed	= 5000,
> @@ -709,7 +709,7 @@ static const struct pcidas64_board pcidas64_boards[] = {
>  		.has_8255	= 1,
>  	},
>  	[BOARD_PCIDAS64_M1_16] = {
> -		.name		= "pci-das64/m1/16",
> +		.name		= "pci-das64-m1-16",
>  		.ai_se_chans	= 64,
>  		.ai_bits	= 16,
>  		.ai_speed	= 1000,
> @@ -725,7 +725,7 @@ static const struct pcidas64_board pcidas64_boards[] = {
>  		.has_8255	= 1,
>  	},
>  	[BOARD_PCIDAS64_M2_16] = {
> -		.name = "pci-das64/m2/16",
> +		.name = "pci-das64-m2-16",
>  		.ai_se_chans	= 64,
>  		.ai_bits	= 16,
>  		.ai_speed	= 500,
> @@ -741,7 +741,7 @@ static const struct pcidas64_board pcidas64_boards[] = {
>  		.has_8255	= 1,
>  	},
>  	[BOARD_PCIDAS64_M3_16] = {
> -		.name		= "pci-das64/m3/16",
> +		.name		= "pci-das64-m3-16",
>  		.ai_se_chans	= 64,
>  		.ai_bits	= 16,
>  		.ai_speed	= 333,
> @@ -984,7 +984,7 @@ static const struct pcidas64_board pcidas64_boards[] = {
>  		.has_8255	= 0,
>  	},
>  	[BOARD_PCIDAS4020_12] = {
> -		.name		= "pci-das4020/12",
> +		.name		= "pci-das4020-12",
>  		.ai_se_chans	= 4,
>  		.ai_bits	= 12,
>  		.ai_speed	= 50,
> 

Userspace applications can use these strings to determine the board
type, so changing the strings would break those applications.

I suggest passing the comedi driver name "cb_pcidas" to request_irq()
for now.

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