linux-kernel - Re: [PATCH v1 1/1] driver core: platform: Make platform_get_irq

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Message-ID: <20210406192514.GA34677@roeck-us.net>
Date:   Tue, 6 Apr 2021 12:25:14 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Uwe Kleine-König <uwe@...ine-koenig.org>,
        linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: Re: [PATCH v1 1/1] driver core: platform: Make
 platform_get_irq_optional() optional

On Wed, Mar 31, 2021 at 05:45:26PM +0300, Andy Shevchenko wrote:
> Currently the platform_get_irq_optional() returns an error code even
> if IRQ resource sumply has not been found. It prevents caller to be
> error code agnostic in their error handling.
> 
> Now:
> 	ret = platform_get_irq_optional(...);
> 	if (ret != -ENXIO)
> 		return ret; // respect deferred probe
> 	if (ret > 0)
> 		...we get an IRQ...
> 
> After proposed change:
> 	ret = platform_get_irq_optional(...);
> 	if (ret < 0)
> 		return ret;
> 	if (ret > 0)
> 		...we get an IRQ...
> 
> Reported-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

This patch causes all my "sh" emulations to stall during boot with the
following repeated error message.

sh-sci sh-sci.1: Can't allocate rx full IRQ

Reverting this patch fixes the problem (and the message is gone).
Bisect log is attached.

Guenter

---
# bad: [9c54130cd25528028b2d38f6ada0c79e92210390] Add linux-next specific files for 20210406
# good: [e49d033bddf5b565044e2abe4241353959bc9120] Linux 5.12-rc6
git bisect start 'HEAD' 'v5.12-rc6'
# good: [3981dcd7199773fc8cfbbcc6173e3521b8e49035] Merge remote-tracking branch 'crypto/master'
git bisect good 3981dcd7199773fc8cfbbcc6173e3521b8e49035
# good: [da18b6c82eba21e87d6ee76b7b0382eca123cc79] Merge remote-tracking branch 'ftrace/for-next'
git bisect good da18b6c82eba21e87d6ee76b7b0382eca123cc79
# bad: [021e2b99a3cb523408609ca1792ab623ff16f334] Merge remote-tracking branch 'staging/staging-next'
git bisect bad 021e2b99a3cb523408609ca1792ab623ff16f334
# bad: [685f903c62e3929370293bad184afa04b6fddebd] Merge remote-tracking branch 'char-misc/char-misc-next'
git bisect bad 685f903c62e3929370293bad184afa04b6fddebd
# good: [67d49fe7e4d40cfe6919b434d6a4e837230af9d4] Merge remote-tracking branch 'ipmi/for-next'
git bisect good 67d49fe7e4d40cfe6919b434d6a4e837230af9d4
# bad: [69e2ae87cfa94c77c3503715e9e0a68e6cc69f8d] Merge remote-tracking branch 'usb/usb-next'
git bisect bad 69e2ae87cfa94c77c3503715e9e0a68e6cc69f8d
# good: [2665a13a3e9ef3d08b9ac4b48328ddfba9126987] usb: typec: Fix a typo
git bisect good 2665a13a3e9ef3d08b9ac4b48328ddfba9126987
# good: [967f6d162d9fa415cf140d3eef5576d566632292] dt-bindings: usb: mtk-xhci: remove redefinitions of usb3-lpm-capable
git bisect good 967f6d162d9fa415cf140d3eef5576d566632292
# good: [d225ef6fda7ce9ff7d28764bd1cceea2d0215e8b] base: dd: fix error return code of driver_sysfs_add()
git bisect good d225ef6fda7ce9ff7d28764bd1cceea2d0215e8b
# bad: [72a91f192da032b68519fafaecce03fd002d669a] driver core: add helper for deferred probe reason setting
git bisect bad 72a91f192da032b68519fafaecce03fd002d669a
# good: [1768289b44bae847612751d418fc5c5e680b5e5c] driver core: platform: Declare early_platform_cleanup() prototype
git bisect good 1768289b44bae847612751d418fc5c5e680b5e5c
# bad: [ed7027fdf4ec41ed6df6814956dc11860232a9d5] driver core: platform: Make platform_get_irq_optional() optional
git bisect bad ed7027fdf4ec41ed6df6814956dc11860232a9d5
# good: [318c3e00f13c2f6e11202a22cc302ea8c70552ea] driver core: Replace printf() specifier and drop unneeded casting
git bisect good 318c3e00f13c2f6e11202a22cc302ea8c70552ea
# first bad commit: [ed7027fdf4ec41ed6df6814956dc11860232a9d5] driver core: platform: Make platform_get_irq_optional() optional