From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Miaoqian Lin <linmq006@gmail.com>
Cc: Mark Brown <broonie@kernel.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] spi: Fix reference count leak in slave_show()
Date: Wed, 19 Mar 2025 12:44:32 +0200 [thread overview]
Message-ID: <Z9qgENjcGFF-rDJe@smile.fi.intel.com> (raw)
In-Reply-To: <20250319032305.70340-1-linmq006@gmail.com>
On Wed, Mar 19, 2025 at 11:23:04AM +0800, Miaoqian Lin wrote:
> Fix a reference count leak in slave_show() by properly putting the device
> reference obtained from device_find_any_child().
...
> struct device *child;
> + int ret;
>
> child = device_find_any_child(&ctlr->dev);
> - return sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : NULL);
> + ret = sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : NULL);
> + put_device(child);
> +
> + return ret;
Can be written better in case of NULL:
child = device_find_any_child(&ctlr->dev);
if (child)
return sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias);
put_device(child);
return sysfs_emit(buf, "%s\n", NULL);
No variable needed.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2025-03-19 10:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-19 3:23 [PATCH] spi: Fix reference count leak in slave_show() Miaoqian Lin
2025-03-19 8:19 ` Geert Uytterhoeven
2025-03-19 10:44 ` Andy Shevchenko [this message]
2025-03-19 10:45 ` Andy Shevchenko
2025-03-19 10:45 ` Andy Shevchenko
2025-03-19 11:17 ` Greg Kroah-Hartman
2025-03-19 17:23 ` Mark Brown
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