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Any control event is queued by a call of snd_ctl_notify(). This function adds the event to each queue of opened file data corresponding to ALSA control character devices. This function acquired two types of lock; a counting semaphore for a list of the opened file data and a spinlock for card data opened by the file. Typically, this function is called after acquiring a counting semaphore for a list of elements in the card data. In current implementation of TLV request handler, the function is called after releasing the semaphore for a list of elements in the card data. This release is not necessarily needed. This commit removes the release to call the function within the critical section so that later commits are simple. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de> |
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| kernel | ||
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.