October 2017
Intermediate to advanced
354 pages
9h 28m
English
Content preview from Mastering Linux Kernel Development
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Control interfaces
The generic IRQ layer provides routines to carry out control operations on IRQ lines. Following is the list of functions for masking and unmasking specific IRQ lines:
void disable_irq(unsigned int irq);
This disables the specified IRQ line by manipulating the counter in the IRQ descriptor structure. This routine is a possible blocking call, as it waits until any running handlers for this interrupt complete. Alternatively, the function disable_irq_nosync() can also be used to disable the given IRQ line; this call does not check and wait for any running handlers for the given interrupt line to complete:
void disable_irq_nosync(unsigned int irq);
Disabled IRQ lines can be enabled with a call to:
void enable_irq(unsigned int ...
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