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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2011-02-08 23:48:16 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-02-24 19:59:00 +0100 |
| commit | 23fe36306ea489eef7dd88506bdcefdc8da39c91 (patch) | |
| tree | e788dffdc10ae283f737604f7cb476c13bcc1bce /Documentation/input/sentelic.txt | |
| parent | mm: prevent concurrent unmap_mapping_range() on the same inode (diff) | |
| download | linux-23fe36306ea489eef7dd88506bdcefdc8da39c91.tar.xz linux-23fe36306ea489eef7dd88506bdcefdc8da39c91.zip | |
ACPI: Avoid calling request_irq() many times for the same interrupt
In principle acpi_os_install_interrupt_handler() may be called
multiple times for different interrupts, either from
acpi_ev_get_gpe_xrupt_block(), or from acpi_ev_install_sci_handler().
However, it always attempts to request the same interrupt,
acpi_gbl_FADT.sci_interrupt and it doesn't check whether or not this
interrupt has already been requested.
Modify this function so that it refuses to request interrupts other
than acpi_gbl_FADT.sci_interrupt and change
acpi_os_remove_interrupt_handler() so that it refuses to free such
interrupts. Use the observation that the only supported ACPI
interrupt must be equal to acpi_gbl_FADT.sci_interrupt and drop an
unnecessary variable acpi_irq_irq.
This change has been tested on Toshiba Portege R500 and HP nx6325
without introducing any visible problems.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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