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| author | Helge Deller <deller@gmx.de> | 2022-03-25 13:10:45 +0100 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2022-03-29 21:37:12 +0200 |
| commit | 1e93848a385ed2c2df9cb246b073dc8c66d10793 (patch) | |
| tree | b1f76268ff20437e11288e311c58425fa417adb6 /arch | |
| parent | parisc: Add constants for control registers and clean up mfctl() (diff) | |
| download | linux-1e93848a385ed2c2df9cb246b073dc8c66d10793.tar.xz linux-1e93848a385ed2c2df9cb246b073dc8c66d10793.zip | |
parisc: Ensure set_firmware_width() is called only once
Call set_firmware_width() only once at runtime.
This prevents that hotplugged CPUs will get stuck in spinlocks later on.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/kernel/firmware.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c index 3370e347dde3..c6b11bdb8602 100644 --- a/arch/parisc/kernel/firmware.c +++ b/arch/parisc/kernel/firmware.c @@ -83,7 +83,7 @@ extern unsigned long pdc_result2[NUM_PDC_RESULT]; /* Firmware needs to be initially set to narrow to determine the * actual firmware width. */ -int parisc_narrow_firmware __ro_after_init = 1; +int parisc_narrow_firmware __ro_after_init = 2; #endif /* On most currently-supported platforms, IODC I/O calls are 32-bit calls @@ -174,6 +174,11 @@ void set_firmware_width_unlocked(void) void set_firmware_width(void) { unsigned long flags; + + /* already initialized? */ + if (parisc_narrow_firmware != 2) + return; + spin_lock_irqsave(&pdc_lock, flags); set_firmware_width_unlocked(); spin_unlock_irqrestore(&pdc_lock, flags); |